SA PD

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This page describes the Phase Detector Module for the DIY Spectrum Analyzer.

Summary

Schematic for the rev0VTx VCO.
Board for the rev0VTx VCO.

The Phase Detector is based on the SLIM PDM from the "Scotty Modular Spectrum Analyzer". The original specifications are for a 360 degree -20 to +18dBm, with an operating frequency range of LF-30MHz (10.7MHz nominal). The original design was modified to use higher speed logic gates in the hope of increasing the upper frequency range, and the addition of a "pass-thru" XOR gate for the IF chain to reduce phase offset error due to the additional gate.

Testing

  • 8.15.2013: ...


Frequency (MHz) Power (dBm)
150 -0.06
200 -0.02
250 -0.03
300 -0.07
350 -0.06
400 0.03
450 0.04
500 0.02
550 -0.07
600 -0.07
650 0.05
700 0.09
750 -0.05
800 -0.03
850 0.02
900 0.00
950 -0.07
1000 -0.10
1500 -0.17
2000 0.21
2500 0.04
3000 0.62
3500 1.72
4000 1.47

Revisions

  • 1.0: Initial revision.

Bill of Materials (v1.0)

Part Quantity Unit Cost Total Cost Source
ADF4350 1 $12.02 $12.02 Digi-Key
FOX924B-10.000 1 $3.76 $3.76 Digi-Key
ADP124 1 $1.95 $1.95 Digi-Key
AP1115 1 $0.54 $0.54 Digi-Key
MSP430G2553 1 $2.58 $2.58 Digi-Key
0402 100nF Capacitor 10 $0.011 $0.11 Digi-Key
0402 10pF Capacitor 10 $0.0116 $0.12 Digi-Key
0603 Capacitor 9 $0.0096 $0.09 eBay - mib_instruments
0603 4.7uF Capacitor 3 $0.1484 $0.45 Digi-Key
0805 10uF Capacitor 1 $0.30 $0.30 Digi-Key
0603 Resistor 10 $0.00294 $0.03 eBay - mib_instruments
0603 Green LED 1 $0.10 $0.10 Digi-Key
0603 Red LED 1 $0.27 $0.27 Digi-Key
0603 Ferrite Bead (470 Ohm) 2 $0.0472 $0.09 Digi-Key
Male Header 8 $0.01 $0.03 eBay
SMA Female Connector 4 $3.37 $13.48 Digi-Key
PCB 1.75"x1.1"/3 $10.00 $6.42 Laen's PCB
Total Unit Cost $42.32

PCB/Construction Photos