1 RF Design Lab RF Design Lab 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 RF Design Lab UP-Converter(ADRF6655) 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) 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) 3 RF Design Lab UP-Converter(ADRF6655) 4 DC power supply VCC: 5 V IP3SET: 3.2 V RF frequency: 470~698 MHz Input power level: -20 dBm Signal generator REFIN: 20 MHz, 1V ADRF6655 - This is our measurement set-up for ADRF6655 - Bias voltages 1. REFIN: 20 MHz, 1 V 2. Vcc: 5 V 3. IP3SET: 3.2 V - We measured ADRF6655 with bias voltages in measurement set-up Spectrum analyzer Measured output power level: About -26 dBm RF Design Lab UP-Converter(ADRF6655) 5 Vcc: 5 V IP3SET: 3.2 V Signal generator :20 MHz Spectrum analyzer RF Design Lab UP-Converter(ADRF6655) Is this setting all right? 6 RF Design Lab UP-Converter(ADRF6655) 7 REFIN: 20 MHz LO Frequency :1690 ~ 1918MHz RF frequency :470 ~ 698MHz IF:1220 MHz Is this setting all right?