RF Design Lab

RF Design Lab

1

RF Design Lab I have some problems about ADRF 6655 and ADF4360-7.

Q1. About ADRF6655 evaluation board Q1.1 : about conversion gain Q1.2 : about IF frequency 2

UP-Converter(ADRF6655)

RF Design Lab Q1.1

I measured ADRF6655 output signal through spectrum analyzer But measured conversion gain is about - 6 dB in the spectrum analyzer .

(voltage conversion gain : 6 dB in datasheet) Is this voltage conversion gain of 6 dB ? Is that correct ??

  Our measurement set-up and software set-up are shown in Page 4~7 Could you check these pages ? I don’t know what is problem. Why is the measured conversion gain of -6 dB ? (voltage conversion gain : 6 dB in datasheet) 3 Q1.2

When I measured the ADRF6655 as up-converter using internal LO frequency.

Some frequency don’t normally operate.

RF input frequency: 470~ 698 MHz  our target IF frequency is 1220 MHz But another IF frequencies occurred at some RF input frequencies.

RF: 490 MHz, LO: 1710 MHz  measured IF : 1380 MHz ( target IF: 1220 MHz)

UP-Converter(ADRF6655)

4 RF Design Lab DC power supply Signal generator V CC : 5 V RF frequency: 470~698 MHz Input power level: -20 dBm REFIN: 20 MHz, 1V IP3SET: 3.2 V ADRF6655 Spectrum analyzer Measured output power level: About -26 dBm 1.

2.

3.

This is our measurement set-up for ADRF6655 Bias voltages REFIN: 20 MHz, 1 V Vcc: 5 V IP3SET: 3.2 V We measured ADRF6655 with bias voltages in measurement set-up

RF Design Lab

UP-Converter(ADRF6655)

Vcc: 5 V IP3SET: 3.2 V 5 Signal generator :20 MHz Spectrum analyzer

RF Design Lab

UP-Converter(ADRF6655)

6 Is this setting all right?

RF Design Lab

UP-Converter(ADRF6655)

7 REFIN: 20 MHz Is this setting all right?

LO Frequency :1690 ~ 1918MHz RF frequency :470 ~ 698MHz IF:1220 MHz