基于ADF4371集成VCO的微波寬帶合成器解決方案

ADI公司的ADF4371是集成壓控振蕩器（VCO）的微波寬帶合成器，其基本輸出頻率范圍從4000MHz到800MHz，和外接大回路濾波器和外接基準頻率一起，可產生62.5MHz到32GHz的輸出頻率，高分辨率39位分數模塊，典型的雜散為-90dBc，集成的rms抖動為38 fs（1 kHz to 100 MHz），歸一化相位噪聲圖為?234 dBc/Hz PFD@ 250 MHz，基準頻率工作600MHz，可編分頻器1，2，4，8，16， 32或64輸出，模擬和數字電源3.3V，VCO電源3.3V和5V，主要用在無線基礎設備（移動通信（MC-GSM）的多載波全球系統，5G），測試測量，航天與國防，時鐘發生器。本文介紹了ADF4371主要特性，功能框圖以及評估板EV-ADF4371SD2Z主要特性，建立圖，電路圖，材料清單和PCB設計圖。

The ADF4371 allows implementation of fractional-N or Integer N phase-locked loop （PLL） frequency synthesizers when used with an external loop filter and an external reference frequency. The wideband microwave voltage controlled oscillator （VCO） design allows frequencies from 62.5 MHz to 32 GHz to be generated. The ADF4371 has an integrated VCO with a fundamental output frequency ranging from 4000 MHz to 8000 MHz. In addition， the VCO frequency is connected to divide by 1，2，4，8，16，32，or 64 circuits that allows the user to generate radio frequency （RF） output frequencies as low as 62.5 MHz at RF8x. A frequency multiplier at RF16x generates from 8 GHz to 16 GHz. A frequency quadrupler generates frequencies from 16 GHz to 32 GHz at RF32x. RFAUX8x duplicates the frequency range of RF8x or permits direct access to the VCO output. To suppress the unwanted products of frequency multiplication， a harmonic filter exists between the multipliers and the output stages of RF16x and RF32x. Control of all on-chip registers is through a 3-wire interface. The ADF4371 operates with analog and digital power supplies ranging from 3.15 V to 3.45 V， and 5 V for the VCO power supply. The ADF4371 also contains hardware and software power-down modes.

ADF4371主要特性：

RF output frequency range： 62.5 MHz to 32，000 MHz

Fractional-N synthesizer and Integer N synthesizer

High resolution 39-bit fractional modulus

Typical spurious PFD： ?90 dBc

Integrated rms jitter： 38 fs （1 kHz to 100 MHz）

Normalized phase noise floor： ?234 dBc/Hz PFD operation to 250 MHz

Reference frequency operation to 600 MHz

Programmable divide by 1，2，4，8，16，32，or64 output

62.5 MHz to 8，000 MHz output at RF8x and RFAUX8x

8，000 MHz to 16，000 MHz output at RF16x

16，000 MHz to 32，000 MHz output at RF32x

Lock time approximately 3 ms with automatic calibration

Lock time 《30 μs with autocalibration bypassed

Analog and digital power supplies： 3.3 V

VCO power supply： 3.3 V and 5 V

RF output mute function

7mm×7mm， 48-terminal LGA package

ADF4371應用：

Wireless infrastructure （multicarrier global system for mobile communication （MC-GSM）， 5 G）

Test equipment and instrumentation

Clock generation

Aerospace and defense

圖1.ADF4371功能框圖

評估板EV-ADF4371SD2Z

圖2.評估板EV-ADF4371SD2Z外形圖

圖3.評估板EV-ADF4371SD2Z建立圖

圖4.評估板EV-ADF4371SD2Z電路圖（1）

圖5.評估板EV-ADF4371SD2Z電路圖（2）

圖6.評估板EV-ADF4371SD2Z電路圖（3）

圖7.評估板EV-ADF4371SD2Z電路圖（4）

評估板EV-ADF4371SD2Z材料清單：

圖8.評估板EV-ADF4371SD2Z PCB設計圖（1）：頂層，絲印

圖9.評估板EV-ADF4371SD2Z PCB設計圖（2）： 底層，絲印

圖10.評估板EV-ADF4371SD2Z PCB設計圖（3）：層1，基層

圖11.評估板EV-ADF4371SD2Z PCB設計圖（4）：層2，地

圖12.評估板EV-ADF4371SD2Z PCB設計圖（5）：層3，電源

圖13.評估板EV-ADF4371SD2Z PCB設計圖（6）：層4，次面