ADI ADMV1014 24－44GHz寬帶微波下變頻器解決方案

ADI公司的ADMV1014是采用硅鍺（SiGe）工藝術(shù)設(shè)計的寬帶微波下變頻器，針對點到點微波無線電設(shè)計進行優(yōu)化，工作頻率范圍為 24.5 GHz 至 43.5 GHz.該下變頻器提供兩種頻率轉(zhuǎn)換模式。該器件能夠從正交解調(diào)直接變頻為基帶 IQ 輸出信號，并從鏡像抑制下變頻為復(fù)中頻輸出載波頻率?；鶐л敵隹刹捎弥绷?a href="http://www.brongaenegriffin.com/tags/耦合/" target="_blank">耦合，特別是IQ 輸出將使用足夠低的高通轉(zhuǎn)折頻率進行交流耦合，以確保充足的解調(diào)精度.SPI 接口可對正交相位進行微調(diào)，使用戶能夠優(yōu)化 IQ 解調(diào)性能。另一方面，可以禁用基帶 IQ 輸出，且 I/Q 信號可通過片內(nèi)有源巴倫提供兩個單端復(fù)中頻輸出（800至6000MHz）。用作鏡像抑制下變頻器時，不需要的鏡像項通常會被抑制，比所需邊帶低 25dBc.

高度集成的ADMV1013微波上變頻器和ADMV1014微波下變頻器非常適用于工作在28 GHz和39 GHz 5G無線基礎(chǔ)設(shè)施頻帶下的微波無線電平臺。這些轉(zhuǎn)換器具有1GHz帶寬，以及OIP3高于20 dBm的上變頻器，可以支持嚴苛的調(diào)制方案（如1024QAM），可支持多Gb無線數(shù)據(jù)。同時該芯片組也支持其他應(yīng)用如衛(wèi)星和地面接收站寬帶通信鏈路，航空無線電，RF測試設(shè)備和雷達系統(tǒng)。本文介紹了ADMV1014主要特性，功能框圖以及評估板ADMV1014-EVALZ主要特性，配置圖，實驗室建立圖，電路圖，材料清單和PCB設(shè)計圖。

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應(yīng)用：

Point to point microwave radios

Radar， electronic warfare systems

Instrumentation， automatic test equipment （ATE）

圖1.ADMV1014功能框圖

評估板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.

評估板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