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TELEFUNKEN Semiconductors
U2795B
2.5-GHz Double Balanced Mixer
Description
U2795B is a 2.5-GHz mixer for WLAN and RF telecommunications equipment, e.g., DECT and PCN, built with TELEFUNKEN's advanced bipolar technology. A double balanced approach was chosen to assure good isolation characteristics and a minimum of spurious products. The input and output are single ended, and their characteristics are programmable. No output transformer or balun is required.
Features
D Supply voltage range: 2.7 to 5.5 V D Single-ended output, no balun required D Single-ended input for RF and LO D Exellent isolation characteristics D Power down mode D IP3 and compression point programmable D 2.5-GHz operating frequency D SO-8 package
Benefits
D Reduced system costs due to few external component
(no balun) requirements
D Standard independent product D 3-V operation reduces the battery count and saves
space
Block Diagram
VS 2 RFi 3 P R1 VH VH VR Voltage regulator PD 8 R2 IFo 5 So 4
LO i 7
GND 6
VS
1
93 7811 e
Rev. A2: 08.06.1995
1 (13)
U2795B
Pin Description
Pin 1 2 3 4 5 6 7 8
TELEFUNKEN Semiconductors
VS RFI P SO
1 2 3 4
94 7890 e
8 7 6 5
PD LOi GND IFO
Symbol VS RFi P SO IFO GND LOi PD
Function Supply voltage RF input Progamming port IP3, CP Output symmetry IF output Ground LO input Power down
Functional Description
Supply Voltage
The IC is designed for a supply voltage of 2.7 to 5.5 V. As the IC is internally stabilized, the performance of the circuit is nearly independent of the supply voltage.
Current Consumption, IS
Depending on the chosen input and output conditions of the IC, the current consumption, IS, is between 4 mA and 10 mA. The current consumption in dependence of Rp is shown in figure 4.
Input Impedance
Input impedance, ZRFi, is about 700 W with an additional capacitive component. This condition provides the best noise figure in combination with a matching network.
Power Down
This feature provides an extension of battery life. If this function is not used, Pin 8 has to be connected to VS (Pin 1).
3. Order Intercept Point (IP3)
Voltage divider, RP / R1, determinates both the input and output intercept point, IIP3 and OIP3. If RP is infinity the IIP3 has the maximum of about - 4 dBm. The IP3/RP characteristics are shown in figure 1 and 2.
Output Symmetry
The symmetry of the load current can be matched and so be optimized for a given load impedance.
Output Impedance and Intercept Point
Output impedance is shown in figure 9. Both low output impedance and a high intercept point are with reference to a high value of RP.
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Rev. A2: 08.06.1995
TELEFUNKEN Semiconductors
U2795B
Symbol VS VI Tj Tstg Value 6 0 to VS 125 - 40 to + 125 Unit V V C C
Absolute Maximum Ratings
Parameters Supply voltage Input voltage Junction temperature Storage temperature range Pin 1 Pins 2, 3, 7 and 8
Thermal Resistance
Parameters Junction ambient SO 8 Symbol Rthja Value 175 Unit K/W
Operating Range
Parameters Supply voltage range Pin 1 Ambient temperature range Symbol VS Tamb Value 2.7 to 5.5 - 40 to + 85 Unit V C
Rev. A2: 08.06.1995
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U2795B
Electrical Characteristics
TELEFUNKEN Semiconductors
VS = 3 V, fLOi = 1 GHz, IF = 900 MHz, RF = 100 MHz, RP =R, system impedance Zo = 50 W, Tamb = 25C, RT = 56 W reference point Pin 6, unless otherwise specified Parameters Supply voltage range Typical supply current range 1 Maximum supply current Conversion power gain Operating frequencies RFi frequency LOi frequency IFo frequency Isolation LO spurious at RFi RFi to LOi LO spurious at IFo Test Conditions / Pin Pin 1 Pin 1 Pin 1 RL = 50 W, RT = RL = 50 W, RT = 56 W Symbol VS IS IS PGC PGC RFi fLOi fIFo 10 50 50 Min. 2.7 4 Typ. Max. 5.5 11 13 9 4 2500 2500 2500 Unit V mA mA dB dB MHz MHz MHz
R
Pin 2 Pin 7 Pin 5 Pin 7 to 2 PiLO = -10 to 0 dBm Pin 2 to 7 PiRF = -25 dBm Pin 7 to 5, PiLO = - 10 to 0 dBm Pin 5 to 7
ISLO-RF ISRF-LO ISLO-IF ISIF-LO CPo ZRFi CPi IIP3
- 30 35 - 25 30 - 10 700Wk0.8pF - 14 -4
dBm dB dBm dB dBm
IFo to LOi Output (IF) Output compression point Pin 5 Input (RF) Input impedance Pin 2 Input compression point Pin 2 Third order input Pin 2 intercept point Input (LO) LO level Pin 7 Voltage standing wave ratio (VSWR) Input LO Pin 7 Output IF Pin 4 Noise performance Noise figure PiLO = 0 dBm, RT = Power down mode Supply current Pin 1 VPD < 0.5 V Pin 1 VPD = 0 V Power down voltage "Power ON" Pin 8 VS = 3.5 to 5.5 V VS = 2.7 to 3.5 V "Power DOWN" Pin 8 Power down current Pin 8 Power ON Power DOWN Settling time Pin 8 to 5
W
dBm dBm
PiLO VSWRLOi VSWRIFo NF ISPD
-6 <2 <2 10 30 <5 VS - 0.5 VS 0.15 <5 <30 VS + 0.5 VS + 0.5 1
dBm
R
dB
mA
V V V mA
VPON VPDN IPON IPDN tsPD
mA ms
Note 1:
Depending on RP
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Rev. A2: 08.06.1995
TELEFUNKEN Semiconductors
U2795B
-4 3 -5 IIP3 ( dBm ) -6 -7 -8 -9 -9 -10 0
94 9235
Gain ( dB )
-1
-5
-13 20 40 60 80 100
94 9237
0
20
40
60
80
100
Rp ( kW )
Rp ( kW )
Figure 1. IIP3 versus resistor Rp, IF: 900 MHz
Figure 3. Gain versus resistor Rp, LO: 1030 MHz, level -10 dBm; RF: 130 MHz, -30 dBm, RT = 56 W
0 12 -5 OIP3 ( dBm ) 10 8 I s ( mA ) 0
94 9236
-10
6 4
-15 -20
2 -25 20 40 60 80 100
94 9238
0 0 20 40 60 80 100 Rp ( kW )
Rp ( kW )
Figure 2. OIP3 versus resistor Rp, IF: 900 MHz
Figure 4. Supply current IS versus resistor Rp
Rev. A2: 08.06.1995
5 (13)
U2795B
18 with RF input matching: Ls = 220nH, Cp = 4.7pF 12 10 8 NF ( dB ) 6 4 with RT = 56 W 0
94 9239
TELEFUNKEN Semiconductors
14 Gain ( dB ) without RT
10
6 2 -2 500 1000 1500 2000 2500
94 9241
2 0 0 200 400 600 800
IF ( MHz )
IF ( MHz )
Figure 5. Gain versus IF output frequency, LO level: -6 dBm, RF: 130 MHz, -35 dBm; parameter: RF input termination
0
Figure 7. Double sideband noise figure versus IF output frequency; LO: 1000 MHz, level 0 dBm; no RF input matching, RT left out
5
-2 -4 IIP3 ( dBm ) -6 -8 -10 -12 -14 -16 -18 0
94 9240
with RT = 56 W 4 without RT VSWR
with RF input matching: Ls = 220 nH, Cp = 4.7 pF
3
2
500
1000
1500
2000
2500
95 9652
IF ( MHz )
1 100
280
460
640
820
1000
IF Frequency ( MHz )
Figure 6. IIP3 versus IF output frequency, LO level: -6 dBm; RF: 130 MHz / 130.1 MHz, -35 dBm; parameter: RF input termination
Figure 8. Typical VSWR frequency response of the IF output, RP =
R
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Rev. A2: 08.06.1995
TELEFUNKEN Semiconductors
U2795B
j
0.5j
2j
0.2j
5j
0
0.2
0.5
1
2
5
1
-0.2j
-0.5j
94 9473
-2j
-j
Figure 9. Typical Impedance of the output versus RP at frequency fIFo = 900 MHz / 22 kW / 10 kW / 8.2 kW / 5.6 kW markers (from left to right): RP =
R
Rev. A2: 08.06.1995
A A
-5j
A A
A AA A AA
AA AA
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U2795B
j
TELEFUNKEN Semiconductors
0.5j
2j
0.2j
5j
0
0.2
0.5
1
2
5
1
-0.2j
-0.5j
-2j
95 9651
-j
Figure 10. Typical S11 frequency response of the IF output, RP = IF frequency from 100 MHz to 1000 MHz, marker: 900 MHz
R,
8 (13)
A A
-5j
A A
AA AA AA AA AA AA
Rev. A2: 08.06.1995
TELEFUNKEN Semiconductors
U2795B
j
0.5j
2j
0.2j
5j
0
0.2
0.5
1
2
5
1
-0.2j
-0.5j
-2j
95 9653
-j
Figure 11. Typical S11 frequency response of the RF intput, RP = RT = RF frequency from 100 MHz to 1000 MHz, marker: 900 MHz
R,
Rev. A2: 08.06.1995
A A
-5j
A A
A AA A AA
AA AA
R
9 (13)
U2795B
j
TELEFUNKEN Semiconductors
0.5j
2j
0.2j
5j
0
0.2
0.5
1
2
5
1
-0.2j
-0.5j
-2j
95 9654
-j
Figure 12. Typical S11 frequency response of the LO intput, RP = LO frequency from 100 MHz to 1000 MHz, marker: 900 MHz
R,
10 (13)
A A
-5j
A A
AA AA AA AA AA AA
Rev. A2: 08.06.1995
TELEFUNKEN Semiconductors
U2795B
Application Circuit (Evaluation Board)
94 8512
Application
C1 VS RT RF RP 3 C6 C3 RSO RI 4 C2 U2795 B 2 7 6 C4 5 IF 1
94 8511
C7 8 C5 LO PD
Rev. A2: 08.06.1995
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U2795B
Part List C1 C2, C3, C4, C5, C6, C7 *RP *RSO RT 10 nF 100 pF 50-W Microstrip 68 W optional 56 W
TELEFUNKEN Semiconductors
With the part list values, the PD settling time is ms. Using other values, time requirements in burst-mode appli- cations have to be considered. Values of RSO and RP depending on the input and output condition requirements. For RSO 68 W is recommended. With the optional RI the intercept and compression point can be slightly increased; values between 500 W and 1 kW are suitable. Please note that such modification will also increase the supply current.
t20
Application Board
Ordering Information
Extended Type Number U2795B-FP Package SO 8
95 9697
Dimensions in mm
Package: SO 8
94 8862
12 (13)
Rev. A2: 08.06.1995
TELEFUNKEN Semiconductors
U2795B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( ODSs). The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency ( EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
Rev. A2: 08.06.1995
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