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[原创] ADI ADRF5545A双路2.4-4.2GHz接收前端解决方案

关键词:无线通信 时分复接(TDD) ADRF5545A

时间:2019-06-18 10:21:59       来源:中电网

ADI公司的ADRF5545A是双路2.4-4.2GHz接收器前端多片模块,主要用在时分复接(TDD).ADRF5545A可采用级联低噪音放大器(LNA)和大功率硅单刀双掷(SPDT)开关来配置成两路.在高增益模式,级联两级LNA和开关在3.6GHz时提供低噪音1.45dB和高增益32dB,输出三阶交调载取点(OIP3)为32dBm(典型值).而在低增益模式,两级LNA的一级被旁路,以更低电流36mA提供16dB增益.在降功耗模式,LNA关断,器件仅消耗12mA.发送时,RF输入连接到端引脚(TERM-CHA或TERM-CHB),开关的插入损耗为0.65dB,能处理长期演进(LTE)平均功率40dBm.器件和RoHS兼容,主要用在无线基础设备,TDD多个输入和多个输出以及有源天线系统,基于TDD的通信系统.本文介绍了ADRF5545A主要特性,功能框图,评估板ADRF5545A-EVALZ主要特性,测试建立图,电路图,材料清单和PCB装配图.

The ADRF5545A is a dual-channel, integrated radio frequency (RF), front-end multichip module designed for time division duplexing (TDD) applications that operates from 2.4 GHz to 4.2 GHz. The ADRF5545A is configured in dual channels with a cascading two-stage low noise amplifier (LNA) and a high power silicon single-pole, double-throw (SPDT) switch.

In high gain mode, the cascaded two-stage LNA and switch offer a low noise figure (NF) of 1.45 dB and a high gain of 32 dB at 3.6 GHz with an output third-order intercept point (OIP3) of 32 dBm (typical). In low gain mode, one stage of the two-stage LNA is in bypass, providing 16 dB of gain at a lower current of 36 mA. In power-down mode, the LNAs are turned off and the device draws 12 mA.

In transmit operation, when RF inputs are connected to a termination pin (TERM-CHA or TERM-CHB), the switch provides a low insertion loss of 0.65 dB and handles long-term evolution (LTE) average power (9 dB peak to average ratio (PAR)) of 40 dBm for full lifetime operation and 43 dBm for single event (<10 sec) LNA protection operation. The device comes in an RoHS compliant, compact, 6 mm × 6 mm, 40-lead LFCSP package.

ADRF5545A主要特性:

Integrated dual-channel RF front end
2-stage LNA and high power SPDT switch
On-chip bias and matching
Single supply operation
Gain
High gain mode: 32 dB typical at 3.6 GHz
Low gain mode: 16 dB typical at 3.6 GHz
Low noise figure
High gain mode: 1.45 dB typical at 3.6 GHz
Low gain mode: 1.45 dB typical at 3.6 GHz
High isolation
RXOUT-CHA and RXOUT-CHB: 47 dB typical
TERM-CHA and TERM-CHB: 52 dB typical
Low insertion loss: 0.65 dB typical at 3.6 GHz
High power handling at TCASE = 105℃
Full lifetime
LTE average power (9 dB PAR): 40 dBm
Single event (<10 sec operation)
LTE average power (9 dB PAR): 43 dBm
High OIP3: 32 dBm typical
Power-down mode and low gain mode for LNA
Low supply current
High gain mode: 86 mA typical at 5 V
Low gain mode: 36 mA typical at 5 V
Power-down mode: 12 mA typical at 5 V
Positive logic control
6 mm × 6 mm, 40-lead LFCSP package

ADRF5545A应用:

Wireless infrastructure
TDD massive multiple input and multiple output and active antenna systems
TDD-based communication systems

图1. ADRF5545A功能框图

评估板ADRF5545A-EVALZ
 
The ADRF5545A is an integrated, dual-channel receiver front end, ideally suited for time division duplexing (TDD) wireless infrastructure applications. The ADRF5545A consists of a high power switch and a two-stage low noise amplifier on each channel.

This user guide describes the ADRF5545A-EVALZ evaluation board, designed to easily evaluate the features and performance of the ADRF5545A.

The ADRF5545A data sheet, available at www.analog.com, provides full specifications for the ADRF5545A. Consult the ADRF5545A data sheet in conjunction with this user guide when using the evaluation board.

评估板ADRF5545A-EVALZ主要特性:

Full featured evaluation board for the ADRF5545A
Easy connection to test equipment
Matching network for 2.6 GHz and 3.6 GHz
Thru line for calibration
EQUIPMENT NEEDED
DC power supply
Signal generator
Spectrum analyzer
Network analyzer

图2.评估板ADRF5545A-EVALZ外形图

图3.评估板ADRF5545A-EVALZ测试建立图

图4.评估板ADRF5545A-EVALZ电路图
评估板ADRF5545A-EVALZ材料清单:


图5.评估板ADRF5545A-EVALZ装配图
详情请见:
https://www.analog.com/media/en/technical-documentation/data-sheets/ADRF5545A.pdf
https://www.analog.com/media/en/technical-documentation/user-guides/ADRF5545A-EVALZ-UG-1589.pdf
ADRF5545A.pdf
ADRF5545A-EVALZ-UG-1589.pdf

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