ADI ADMV1014 24－44GHz宽带微波下变频器解决方案

ADI公司的ADMV1014是采用硅锗（SiGe）工艺术设计的宽带微波下变频器，针对点到点微波无线电设计进行优化，工作频率范围为 24.5 GHz 至 43.5 GHz.该下变频器提供两种频率转换模式。该器件能够从正交解调直接变频为基带 IQ 输出信号，并从镜像抑制下变频为复中频输出载波频率。基带输出可采用直流耦合，特别是IQ 输出将使用足够低的高通转折频率进行交流耦合，以确保充足的解调精度.SPI 接口可对正交相位进行微调，使用户能够优化 IQ 解调性能。另一方面，可以禁用基带 IQ 输出，且 I/Q 信号可通过片内有源巴伦提供两个单端复中频输出（800至6000MHz）。用作镜像抑制下变频器时，不需要的镜像项通常会被抑制，比所需边带低 25dBc.

高度集成的ADMV1013微波上变频器和ADMV1014微波下变频器非常适用于工作在28 GHz和39 GHz 5G无线基础设施频带下的微波无线电平台。这些转换器具有1GHz带宽，以及OIP3高于20 dBm的上变频器，可以支持严苛的调制方案（如1024QAM），可支持多Gb无线数据。同时该芯片组也支持其他应用如卫星和地面接收站宽带通信链路，航空无线电，RF测试设备和雷达系统。本文介绍了ADMV1014主要特性，功能框图以及评估板ADMV1014-EVALZ主要特性，配置图，实验室建立图，电路图，材料清单和PCB设计图。

The ADMV1014 is a silicon germanium （SiGe）， wideband， microwave downconverter optimized for point to point microwave radio designs operaTIng in the 24 GHz to 44 GHz frequency range.

The downconverter offers two modes of frequency translaTIon. The device is capable of direct quadrature demodulaTIon to baseband inphase （I）/quadrature （Q） output signals， as well as image rejecTIon downconversion to a complex intermediate frequency （IF） output carrier frequency. The baseband outputs can be dc-coupled， or， more typically， the I/Q outputs are ac-coupled with a sufficiently low high-pass corner frequency to ensure adequate demodulation accuracy. The serial port interface （SPI） allows fine adjustment of the quadrature phase to allow the user to optimize I/Q demodulation performance. Alternatively， the baseband I/Q outputs can be disabled， and the I/Q signals can be passed through an on-chip active balun to provide two single-ended complex IF outputs anywhere between 800 MHz and 6000 MHz. When used as an image rejecting downconverter， the unwanted image term is typically suppressed to better than 30 dBc below the wanted sideband. The ADMV1014 offers a flexible local oscillator （LO） system， including a frequency quadruple option allowing up to a 41 GHz range of LO input frequencies to cover a radio frequency （RF） input range as wide as 24 GHz to 44 GHz. A square law power detector is provided to allow monitoring of the power levels at the mixer inputs. The detector output provides closed-loop control of the RF input variable attenuator through an external op amp error integrator circuit option.

The ADMV1014 downconverter comes in a compact， thermally enhanced， 5 mm × 5 mm LGA package. The ADMV1014 operates over the −40℃ to +85℃ case temperature range.

ADMV1014主要特性：

Wideband RF input frequency range： 24 GHz to 44 GHz

2 downconversion modes

Direct conversion from RF to baseband I/Q

Image rejecting downconversion to complex IF

LO input frequency range： 5.4 GHz to 10.25 GHz

LO quadrupler for up to 41 GHz

Matched 50 Ω， single-ended RF input， and complex IF outputs

Option between matched 100 Ω balanced or 50 Ω single-ended LO inputs

100 Ω balanced baseband I/Q output impedance with adjustable output common-mode voltage level

Image rejection optimization

Square law power detector for setting mixer input power

Variable attenuator for receiver power control

Programmable via a 4-wire SPI interface

32-terminal， 5 mm × 5 mm LGA package

ADMV1014应用：

Point to point microwave radios

Radar， electronic warfare systems

Instrumentation， automatic test equipment （ATE）

图1.ADMV1014功能框图

评估板ADMV1014-EVALZ

The ADMV1014-EVALZ evaluation board incorporates the ADMV1014 with a microcontroller， low dropout （LDO） regulators， and nanoDAC® to allow quick and easy evaluation of the ADMV1014. The microcontroller allows the user to configure the ADMV1014 register map through the ACE software. The LDO regulators allow the ADMV1014 to be powered on by a single supply and offer good power supply ripple rejection. The nanoDAC allows the user to attenuate the RF power going into the mixer of ADMV1014 without using an external power supply.

For full details on the ADMV1014， see the ADMV1014 data sheet， which must be consulted in conjunction with this ADMV1014-EVALZ evaluation board user guide when using this evaluation board.

评估板ADMV1014-EVALZ主要特性：

Full featured evaluation board for the ADMV1014

On-board USB for SPI control

5 V operation

ACE software interface for SPI control

图2.评估板ADMV1014-EVALZ外形图

图3.评估板ADMV1014-EVALZ配置图

图4.评估板ADMV1014-EVALZ顶视图

图5.评估板ADMV1014-EVALZ I/O模式实验室建立图

图6.评估板ADMV1014-EVALZ IF模式实验室建立图

图7.评估板ADMV1014-EVALZ电路图-ADMV1014连接图

图8.评估板ADMV1014-EVALZ电路图-MCU和电平转换连接图

图9.评估板ADMV1014-EVALZ电路图-LDO稳压器连接图

评估板ADMV1014-EVALZ材料清单：

图10.评估板ADMV1014-EVALZ：左：正面;右：背面

图11.评估板ADMV1014-EVALZ PCB设计图：顶层

图12.评估板ADMV1014-EVALZ PCB设计图：第二层电压

图13.评估板ADMV1014-EVALZ PCB设计图：第三层

图14.评估板ADMV1014-EVALZ PCB设计图：底层