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iterra communications 2440-a embarcadero way palo alto, ca. 94303 r3.1. sept. 13, 2004 doc. 1316 page 1 of 14 www.iterrac.com specifications are based on most current or latest revision. ITR20420 20-42 ghz general purpose mmic amplifier the ITR20420 is a broadband general purpose driver amplifier designed for use in point to point radio, point to multi-point communications, lmds , satcom and other millimeter wave applications. the ITR20420 is a fully matched gaas mmic utilizing an advanced 0.15 m gate length phemt process. description absolute ratings electrical characteristics 1 ? wideband 20 - 42 ghz operation ? 22 db small signal gain (typ.) ? 23 dbm saturated power output (typ.) ? rf input/output internally matched to 50 ohms ? optional bonding configuratio n for multiplier applications ? chip size 1.720 mm x 0.760 mm x 50 m features notes: 1. operated at 25 c, 50 ohm system, v d =+3.5 v, quiescent current (i dq )=350 ma. 2. typical range of the negative gate voltage is -0.9 to ?0.15 v to set typical i dq of 350 ma. 3. production measurements for small signal gain ar e made over a frequency range of 20 to 40 ghz. 4. saturated power measurements are not 100% tested, but guaranteed by design. parameter symbol value unit positive dc voltage (+3.5 v typical) v d + 5 volts negative dc voltage v g -2 volts simultaneous (v d -v g ) v dg + 7 volts positive dc current i d 600 ma rf input power (from 50 ? source) pin 15 dbm operating base plate temperature tc -30 to +85 c storage temperature range tstg -55 to +125 c thermal resistance rjc 57 c/w (channel to backside) parameter min typ max unit frequency range 20 42 ghz drain supply voltage (v d )2 3.5 5 v gate supply voltage (v g ) 2 -2 -0.6 -0.15 v small signal gain 3 (f=20-22 ghz) 18 20 db (f=22-42 ghz) 20 22 db gain variation vs. frequency +/-2.5 db power output at 1 db compression 21 dbm parameter min typ max unit power output saturated 4 22 23 dbm drain current at p1db compression 355 ma drain current at psat 362 ma input return loss (pin=-20 dbm) 12 db output return loss (pin=-20 dbm) 10 db
iterra communications 2440-a embarcadero way palo alto, ca. 94303 r3.1. sept. 13, 2004 doc. 1316 page 2 of 14 www.iterrac.com specifications are based on most current or latest revision. ITR20420 20-42 ghz general purpose mmic amplifier chip layout and bond pad locations chip size=0.0677? x 0.30? x 0.002? (1720 m x 760 m x 50 m) functional block diagram rf in rf out gate supply (2nd-4th stages) drain supply (2nd-4th stages) ground (back of chip) mmic chip vd1 vg2 alt vd2 vd3 vd4 vg1 vg2 vg3 vg4 drain supply (1st stage) gate supply (1st stage) back of chip is rf and dc ground 0.0065? (0.165mm) 0.0185? (0.465mm) 0.0125? (0.315mm) 0.0 0.004? (0.1mm) 0.0299? (0.760mm) 0.0 0.004? (0.1mm) 0.0168? 0.430mm) 0.028? (0.715mm) 0.0475? (1.200mm) 0.0064? (1.620mm) 0.0677? (1.70mm) 0.0130? (0.335mm) 0.0275? (0.700mm) 0.0365? (0.930mm) 0.0465? (1.180mm) 0.0575? 1.465mm) 0.013? (0.330mm) 0.0249? (0.630mm) 0.0189? (0.480mm)
iterra communications 2440-a embarcadero way palo alto, ca. 94303 r3.1. sept. 13, 2004 doc. 1316 page 3 of 14 www.iterrac.com specifications are based on most current or latest revision. ITR20420 20-42 ghz general purpose mmic amplifier drain supply (v d ) (connect to both v d1 & v d3 ) gate supply (v g1 ) (v g1 , v g2 , v g3 ) rf in rf out ground (back of chip) mmic chip bond wires ls bond wire ls 10,000pf 100pf vd1 vg2 alt vd2 vd3 vd4 vg1 vg2 vg3 vg4 100pf 10,000pf note: for currents > 370 ma connect all four drain pads to the 100pf capacitor. schematic of application circuit recommended assembly and bonding diagram v d (positive) 100pf 100pf 10,000pf 10,000pf v g (negative) rf input rf output 5mil thick alumina 50-ohm 5 mil thick alumina 50-ohm 2 mil gap l< 0.015? die-attach 80au/20sn l< 0.015? 4 places interchangeable v d bond pads (do not use vd2) interchangeable vg bond pads v d1 v g2 alt v d2 v d3 v d4 v g1 v g2 v g3 v g4 notes: 1. die-attach with 80au/20sn 2. use 0.003? x 0.0005? gold ribbon for bonding. 3. rf input and output bonds should be less than 0.015? long with stress relief. 4. for currents > 370 ma connect all drain pads (vd1, vd3, & vd4) to the 100 pf capacitor. 5. back of chip is dc and rf ground. 6. do not use vd2 pad for drain bias connection note: the input does not have a dc blocking capacitor. it is terminated with a 50 ohm resistor to ground on chip and it is isolated from any dc bias.
iterra communications 2440-a embarcadero way palo alto, ca. 94303 r3.1. sept. 13, 2004 doc. 1316 page 4 of 14 www.iterrac.com specifications are based on most current or latest revision. ITR20420 20-42 ghz general purpose mmic amplifier caution: loss of gate voltage (v g ) while drain voltage (v d ) is present can damage the amplifier. the following sequence must be followed to properly test the amplifier: step 1: turn off rf input power. step 2: connect the dc supply grounds to the ground of the chip carrier. slowly apply negative gate bias supply voltage of -1.5 v to v g . step 3: slowly apply positive drain bias supply voltage of +3.5 v to v d . step 4: adjust gate bias voltage to set the quiescent current of i dq =350 ma. step 5: after the bias condition is established, the rf input signal may now be applied at the appropriate frequency band. step 6: follow turn-off sequence of: (i) turn off rf input power, (ii) turn down and off drain voltage (v d ), (iii) turn down and off gate bias voltage (v g ). recommended procedure (for biasing and operation) caution: this is an esd sensitive device chip carrier material should be selected to have gaas compatible thermal coefficient of expansion and high thermal conductivity such as copper moly bdenum or copper tungsten. the chip carrier should be machined, finished flat, plated with gold over nickel and should be capable of withstanding 325c for 15 minutes. die attachment for power devices should utilize gold/tin (80/20) eutectic alloy solder and should avoid hydrogen environment for phemt devices. note that the backside of t he chip is gold plated and is used as rf and dc ground. these gaas devices should be handled with care a nd stored in dry nitrogen environment to prevent contamination of bonding surfaces . these are esd sensitive devices and should be handled with appropriate precaution including the use of wrist-grounding straps. all die attach and wire/ribbon bond equipment must be well grounded to prev ent static discharges through the device. recommended wire bonding uses 3 mils wide and 0.5 mil thick gold ribbon with lengths as short as practical allowing for appropriate stress relief. t he rf input and output bonds should be typically 0.012? long corresponding to a typical 2 mil gap between the chip and the substrate material. application information
iterra communications 2440-a embarcadero way palo alto, ca. 94303 r3.1. sept. 13, 2004 doc. 1316 page 5 of 14 www.iterrac.com specifications are based on most current or latest revision. ITR20420 20-42 ghz general purpose mmic amplifier performance data normal amplifier configuration 0 5 10 15 20 25 30 20 22 24 26 28 30 32 34 36 38 40 42 frequency (ghz) p1db (dbm) typical output power @ 1db compression bias v d =3.5 v, i dq =350 ma typical ss gain vs. frequency vs. supply current bias v d =3.5 -40 -35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 0 1020304050 frequency (ghz) (db) 200 ma 300 ma 350 ma 400 ma
iterra communications 2440-a embarcadero way palo alto, ca. 94303 r3.1. sept. 13, 2004 doc. 1316 page 6 of 14 www.iterrac.com specifications are based on most current or latest revision. ITR20420 20-42 ghz general purpose mmic amplifier performance data typical input return loss vs. frequency bias v d =3.5 v, i dq =350 ma typical output return loss vs. frequency bias v d =3.5 v, i dq =350 ma -60 -50 -40 -30 -20 -10 0 0 1020304050 frequency (ghz) (db) -35 -30 -25 -20 -15 -10 -5 0 0 1020304050 frequency (ghz) (db)
iterra communications 2440-a embarcadero way palo alto, ca. 94303 r3.1. sept. 13, 2004 doc. 1316 page 7 of 14 www.iterrac.com specifications are based on most current or latest revision. ITR20420 20-42 ghz general purpose mmic amplifier performance data typical ss gain vs. frequency vs. base plate temperature bias v d =3.5 v, i dq =350 ma typical ss gain vs. frequency vs. supply voltage supply current=350 ma -30 -20 -10 0 10 20 30 40 0 1020304050 frequency (ghz) s21 (db) 90 c 20 c -40 c -40 -30 -20 -10 0 10 20 30 40 0 1020304050 frequency (ghz) (db) v d =5.0 v d =3.5 v d =2.0
iterra communications 2440-a embarcadero way palo alto, ca. 94303 r3.1. sept. 13, 2004 doc. 1316 page 8 of 14 www.iterrac.com specifications are based on most current or latest revision. ITR20420 20-42 ghz general purpose mmic amplifier performance data 17 19 21 23 25 27 15 17 19 21 23 output power (dbm) gain (db) 0% 4% 8% 12% 16% 20% pae (%) pae gain 17 19 21 23 25 27 15 17 19 21 23 output power (dbm) gain (db) 0% 4% 8% 12% 16% 20% pae (%) pae gain gain compression and pae vs. output power frequency=30 ghz, bias v d =3.5 v, i dq =350 ma gain compression and pae vs. output power frequency=40 ghz, bias vd=3.5 v, id=350 ma
iterra communications 2440-a embarcadero way palo alto, ca. 94303 r3.1. sept. 13, 2004 doc. 1316 page 9 of 14 www.iterrac.com specifications are based on most current or latest revision. ITR20420 20-42 ghz general purpose mmic amplifier performance data 5 6 7 8 9 10 11 12 13 14 15 20 22 24 26 28 30 32 34 36 38 40 frequency (ghz) noise figure (db) idq= 100 ma idq= 200 ma idq= 350 ma 5 6 7 8 9 10 11 12 13 14 15 20 22 24 26 28 30 32 34 36 38 40 frequency (ghz) noise figure (db) vd= 5.0 vd= 4.5 vd= 2.0 vd= 3.5 noise figure vs. frequency vs. supply current bias v d =3.5 volts noise figure vs. frequency vs. supply voltage supply current=200ma
iterra communications 2440-a embarcadero way palo alto, ca. 94303 r3.1. sept. 13, 2004 doc. 1316 page 10 of 14 www.iterrac.com specifications are based on most current or latest revision. ITR20420 20-42 ghz general purpose mmic amplifier application information multiplier operation the ITR20420 can be used as an even harmonic mu ltiplier or as an odd harmonic multiplier depending on the type of dc biasing arrangement being used. optimum dc bias is applied to peak the desired harmonic which falls into the 20 to 42 ghz passband. the following application information will detail the configuration and proc edure for using the ITR20420 as an even harmonic multiplier and as an odd harmonic multiplier. typical measured data is provided at selected frequencies within the passband with the itr2042 0 configured as a doubler and as a tripler. multiplier operation the iterra ITR20420 is a four stage general purpose mmic amplifier covering the 20-42 ghz passband. the amplifier has a steep gain roll off at the band edges and the input return loss of the amplifier is better than 10 db from 42 ghz down to dc. any multiplier harmonics, which fall in the passband, will get amplified and any harmonics t hat fall below the passband will get suppressed. a deliberate design feature that makes the ITR20420 an effective multiplier is the ability to independently bias the first stage. this feature allows freedom to determine the optimum dc bias condition required to peak the desired harmonic and suppressing the unwanted harmonics. optimum dc bias conditions depend largely on factors su ch as fundamental frequency, desired harmonic frequency, input power level, output po wer level and suppression requirements. test set up the basic test set uses a source to provide the in put signal at the desired frequency and power level. the dut was biased either as an even harmonic or odd harmonic operation and the output was observed on a spectrum analyzer. the power of the harmonics was measur ed using the spectrum analyzer with all the cable losses account ed. figure 1 shows the basic test set used. dut source spectrum analyzer ITR20420 figure 1. basic test set up.
iterra communications 2440-a embarcadero way palo alto, ca. 94303 r3.1. sept. 13, 2004 doc. 1316 page 11 of 14 www.iterrac.com specifications are based on most current or latest revision. ITR20420 20-42 ghz general purpose mmic amplifier even harmonic operation even harmonics are generated whenever the symmetry of the input signal waveform is distorted. this is accomplished by biasing the first stage operat ing point in a region of the i-v curve where the device is near pinch-off. in this condition, t he first stage becomes a half wave rectifier where conduction only occurs on positive half cycles of the input wavefo rm. thus, presenting an asymmetrical waveform consisting mainly of positive half cycles which is rich in even harmonics to the remaining stages of the amplifier. for most even harmonic multiplier operations, the first stage is usually pinched off and the remaining stages are biased as a linear amplifier. as an example, the ITR20420 was evaluated as a doubler. in the doubler operation, two drain voltages of +3.5v we re used: one for first stage (v d1 ) and the other (v d2 ) for the remaining 3 stages tied together as s hown in figure 2. independent biasing of the first stage was achieved by using two separate gate voltages. v g1 was used for stage one and set to v g1 =-1.0v (near pinch-off). v g2 was used for the remaining three stages. vg2 was adjusted until idq =330ma. for each input frequency and input power level, v g1 was adjusted to peak the second harmonic. small changes in v g2 and v d2 at this point help in suppressing odd harmonics. figure 3 shows the doubler performance over the 20 to 42 ghz band for a fixed input power level of +12 dbm. the graph shows doubled frequencies with output powe r levels greater than +16dbm over the 20-42 ghz band. the graph also shows the increasing power le vel of the fundamental at the higher end of the band since the fundamental frequency approaches t he lower band edge of the amplifier passband. based on these measurements t he ITR20420 can be used a doubler to give desired frequencies anywhere in the 20-42 ghz band with a conversion gain up to 8 db and second harmonic power levels up to 20 dbm. rf in rf out v g1 v d2 vd1 vg2 alt vd2 vd3 vd4 vg1 vg2 vg3 vg4 v d1 v g2 figure 2. ITR20420 configured as doubler. application information multiplier operation
iterra communications 2440-a embarcadero way palo alto, ca. 94303 r3.1. sept. 13, 2004 doc. 1316 page 12 of 14 www.iterrac.com specifications are based on most current or latest revision. ITR20420 20-42 ghz general purpose mmic amplifier conversion gain = 0 2 x fo 1 x fo -30 -20 -10 0 10 20 30 20 22 24 26 28 30 32 34 36 38 40 42 second harmonic frequency (ghz) pout (dbm) rf in rf out vd1 vg2 alt vd2 vd3 vd4 vg1 vg2 vg3 vg4 v d2 v g1 figure 3. measured doubler performance. odd harmonic operation odd harmonics are generally associated with a square wave. the ITR20420 is biased in such a way that causes the clipping of the i nput sine wave to closely approximate a square wave provided a high input drive level is maintained. if biased in a manner, which causes the input waveform to be clipped equally in the positive and negativ e cycles, then a symmetrical square wave will be approximated which contains odd harmonics. as an example, the ITR20420 was biased as a tripler over the 20-40g hz band at selected frequencies. in this mode of oper ation all the drains voltages (v d1 and v d2 ) were tied together and all the gate voltages were tied together as shown in figure 4. figure 4. ITR20420 configured as tripler. application information multiplier operation
iterra communications 2440-a embarcadero way palo alto, ca. 94303 r3.1. sept. 13, 2004 doc. 1316 page 13 of 14 www.iterrac.com specifications are based on most current or latest revision. ITR20420 20-42 ghz general purpose mmic amplifier the test set up for this mode of operation is as shown in figure 1.the biasing procedure requires the gate voltage v g1 to be initially set to ?1.0v. next the drain voltage v d1 was set to +2.0v. the input frequency was selected to give the desired tripl ed output and the input drive level was set to +14dbm. the output of the itr 20420 was observed and the harmonics of the input frequency were visible on the spectrum analyzer display. the gate voltage v g1 was adjusted gradually to peak the third harmonic. lowering v g1 resulted in peaking the third ha rmonic. then the drain voltage v d1 was adjusted to tweak the power level of the third harmonic. tweaking v g1 and v d1 at this point resulted in further optimization of the desired harmonic or suppression of the unwanted harmonic as required. the range for v g1 was between ?0.1 to ?0.6v and the range for v d1 was between +1.1 to +1.8v. the above procedure was repeated for each input frequency tested. figure 5 shows the tripled output for the it r20420 biased as described above. input frequencies were selected to give tripled frequencies falli ng in the 21 to 39 ghz band. the graph shows tripled output powers greater than +10dbm up to 39 ghz. the power levels of the first and second harmonics were also plotted to show the level of suppression of the unwanted harmonics. the graph shows for a tripled frequency of 30 ghz the out put power was +14 dbm, the fundamental (10ghz) power level was ?17 dbm and the second harmonic (20 ghz) power level was +3 dbm. the conversion gain for the tripled output at 30gh z was 0db. for tripled frequencies between 21 to 39ghz, the conversion gain was better than ?4 db. 1xfo 39ghz 30ghz 21ghz -20 -15 -10 -5 0 5 10 15 20 20 22 24 26 28 30 32 34 36 38 40 t ripled frequency (ghz) pout (dbm) 2xfo 3xfo conversion gain =0 figure 5. measured tripler performance. application information multiplier operation
iterra communications 2440-a embarcadero way palo alto, ca. 94303 r3.1. sept. 13, 2004 doc. 1316 page 14 of 14 www.iterrac.com specifications are based on most current or latest revision. ITR20420 20-42 ghz general purpose mmic amplifier disclaimer iterra communications reserves the right to make changes without further notice to any products herein to improve reliability, function or design. iterra does not assume any liability arising out o the application or use of any product or circuit des cribed herein; neither does it convey any license under its patent rights, nor the rights of others. product status definitions definition product status datasheet identification this datasheet contai ns specifications on a product that has been discontinued by iterra. the datasheet is printed for reference information only. not in production obsolete this datasheet contains final specifications. iterra reserves the right to make changes at any time without notice in order to improve design. full production no identification needed this datasheet contains preliminary data, and supplementary data will be published at a later date. iterra reserves the right to make changes at any time without notice in order to improve design. first production preliminary this datasheet contains the design specifications for product development. specifications may change in any manner without notice. formative or or in design advance information

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