ADI公司的ADRF6807是工作在2.8-4.2GHz的集成了PLL和VCO的大動態范圍IQ解調器,LO頻率范圍700MHz到1050MHz,IP3可達26.7dBm,噪音(DSB)為13.1dB,電壓轉換增益1.0dB/4.3dB.相位正交解調精度優于0.5度,幅度正交解調精度優于0.1dB,基帶解調170MHz/135MHz,3dB帶寬,PLL編程采用SPI串口,主要用在QAM/QPSK RF/IF解調器,蜂窩CDMA" title="W-CDMA">W-CDMA/CDMA/CDMA2000,微波點對點(多點)無線電,寬帶無線和WiMAX.本文介紹了ADRF6807主要特性,方框圖, 基本的連接電路, 評估板電路圖和材料清單(BOM), 評估板元件布局圖以及評估板通用特性,噪音特性別和相位噪音特性測試圖.

The ADRF6807 is a high dynamic range IQ demodulator with integrated phase-locked loop (PLL) and voltage controlled oscillator (VCO). The fractional-N PLL/synthesizer generates a frequency in the range of 2.8 GHz to 4.2 GHz. A programmable quadrature divider (divide ratio = 4) divides the output frequency of the VCO down to the required local oscillator (LO) frequency to drive the mixers in quadrature. Additionally, an output divider (divide ratio = 4 to 8) generates a divided-down VCO signal for external use. The PLL reference input is supported from 9 MHz to 160 MHz. The phase detector output controls a charge pump whose output is integrated in an off-chip loop filter. The loop filter output is then applied to an integrated VCO. The IQ demodulator mixes the differential RF input with the complex LO derived from the quadrature divider. The differential I and Q output paths have excellent quadrature accuracy and can handle baseband signaling or complex IF up to 120 MHz. A reduced power mode of operation is also provided by programming the serial interface registers to reduce current consumption, with slightly degraded input linearity and output current drive. The ADRF6807 is fabricated using an advanced silicon-germanium BiCMOS process. It is available in a 40-lead, exposed paddle, RoHS-compliant, 6 mm × 6 mm LFCSP package. Performance is specified over the −40℃ to +85℃ temperature range.

ADRF6807主要特性:

IQ demodulator with integrated fractional-N PLL

LO frequency range: 700 MHz to 1050 MHz

For the following specifications (LPEN = 0)/(LPEN = 1):

Input P1dB: 12.8 dBm/11.7 dBm Input

IP3: 26.7 dBm/24.0 dBm

Noise figure (DSB): 13.1 dB/12.4 dB

Voltage conversion gain: 1.0 dB/4.3 dB

Quadrature demodulation accuracy

Phase accuracy: <0.5°

Amplitude accuracy: <0.1 dB

Baseband demodulation: 170 MHz/135 MHz, 3 dB bandwidth

SPI serial interface for PLL programming

40-lead, 6 mm × 6 mm LFCSP

ADRF6807應用:

QAM/QPSK RF/IF demodulators

Cellular W-CDMA/CDMA/CDMA2000

Microwave point-to-(multi)point radios

Broadband wireless and WiMAX

圖1.ADRF6807方框圖

圖2.ADRF6807基本的連接圖

圖3.ADRF6807評估板電路圖
ADRF6807評估板材料清單(BOM):



圖4.ADRF6807評估板元件布局圖(頂層)

圖5.ADRF6807評估板元件布局圖(底層)

圖6.ADRF6807評估板通用特性測試圖

圖7.ADRF6807評估板噪音特性測試圖

圖8.ADRF6807評估板相位噪音特性測試圖
詳情請見:
http://www.analog.com/static/imported-files/data_sheets/ADRF6807.pdf