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Preliminary
Sampling Phase Detectors
SPD1101-111, SPD1102-111, SPD1103-111 Features
I For Phase Locked VCOs to 22 GHz I Reference Frequencies Below 50 MHz I New Surface Mount Package Design I Small Footprint (90 x 110 Mils) I Automated Chip on Board Construction
Description
Alpha has redesigned its product line of sampling phase detectors using automated chip on board manufacturing technology to provide a more uniform, surface mountable, small footprint device without sacrificing the microwave performance of the original design. Sampling phase detectors are used to phase lock a microwave VCO to a stable reference source at a submultiple frequency. The sampling phase detector consists of a step recovery diode, capacitors and a microwave mixer consisting of series pair Schottky diodes. The principle of operation may be described as using the step recovery diode to generate a harmonic comb of the reference oscillator frequency and the Schottky diode as a mixer between the closest reference frequency multiple and the microwave signal generated by the VCO. When these frequencies are identical the IF (beat note) signal is a DC voltage; the IF will be sinusoidal when the frequencies are unequal. The SPD1100 series sampling phase detectors use a selected step recovery diode chip whose carrier lifetime and transition time are appropriate for use in applications allowing reference frequencies below 50 MHz and microwave VCO frequencies as high as 22 GHz. The
Schottky diodes used are low capacitance devices capable of efficient mixer performance at frequencies above 22 GHz. The SPD1101-111, SPD1102-111 and SPD1103-111 utilize low, medium and high barrier Schottky diodes and may be selected according to the available power generated by the microwave VCO.
Absolute Maximum Ratings
Characteristic Incident Power Operating Temperature Storage Temperature ESD Human Body Model Value 27 dBm -65 to +150C -65 to +175C Class 1B
Electrical Characteristics at 25C
Part Number Microwave Signal Drive Level (dBm) Typ. SPD1101-111 SPD1102-111 SPD1103-111 -3 to 0 0 to +3 0 to +13 Low Medium High 270-350 370-550 600-700 Schottky Diode Barrier VF @ 1 mA (mV) CJ @ 0 V (pF) Max. 0.10 0.10 0.10 RT @ 5 mA () Max. 24 24 24 Capacitor CC (pF) Typ. 0.5 0.5 0.5 Step Recovery Diode CJ @ 6 V (pF) Max. 0.25 0.25 0.25 TL (nS) Typ. 10 10 10 TT (pS) Typ. 70 70 70
Alpha Industries, Inc. [781] 935-5150 * Fax [978] 241-7906 * Email sales@alphaind.com * www.alphaind.com
Specifications subject to change without notice. 9/01A
1
Sampling Phase Detectors
SPD1101-111, SPD1102-111, SPD1103-111
Typical Performance
1000
Suggested Circuit
100 REFERENCE FREQUENCY INPUT 10-500 MHz 47 pF VCO INPUT 10 k
Best Note Voltage (mV)
800 600 400 200 0 0 2 4 6
Ref. Frequency: 100 MHz Ref Input Power: 17 dBm VCO Power: 0 dBm
CL SRD CL INPUT TRANSFORMER
22 pF
RFC 100
IF OUTPUT
8
10 12 14 16 18 20 22
47 pF
100 10 k
39 pF
VCO Frequency (GHz)
SPD1101-111
Input transformer: 10:1 step down impedance ratio.
Schematic Diagram
4
-111 Package Outline
0.110 (2.794 mm) 4
3
5
0.090 (2.286 mm)
SRD
3
A1
2 1 EPOXY CERAMIC
5
2 SCHEMATIC
1
0.015 (0.381 mm)
0.040 (1.016 mm)
0.073 (1.854 mm) 0.053 (1.346 mm) 0.017 (0.432 mm) 0.000 0.000 0.017 (0.432 mm) 0.037 (0.940 mm) 0.073 (1.854 mm) 0.093 (2.362 mm)
2
Alpha Industries, Inc. [781] 935-5150 * Fax [978] 241-7906 * Email sales@alphaind.com * www.alphaind.com
Specifications subject to change without notice. 9/01A
0.002 (0.051 mm) 0.039 (0.941 mm) 0.072 (1.829 mm) 0.108 (2.743 mm) 0.088 (2.235 mm) 0.002 (0.051 mm)

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