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[讨论] TI LMH6881 1GHz全差分可编放大器解决方案

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发表于 2015-4-23 08:24:45 | 显示全部楼层 |阅读模式
TI公司的LMH6881是全差分可编高速放大器,工作频率高达1GHz, 100Ω输入,低阻抗输出,增益数字控制,从6dB到26dB,小信号带宽2400MHz,100MHz时的OIP3为44dBm, HD3为-100dBc,噪音为9.7dB,主要用在示波器前端,频谱分析仪增益区块,差分ADC驱动器,IF/RF和基带增益驱块和医疗图像.本文介绍了LMH6881主要特性,典型应用电路和
评估板LMH6881EVAL主要特性,电路图和PCB布局图.

LMH6881主要特性:

Small Signal Bandwidth: 2400MHz

OIP3 @ 100 MHz: 44dBm

HD3 @ 100 MHz: −100dBc

Noise Figure: 9.7dB

Voltage Gain Range: 26dB to 6dB

Voltage Gain Step Size 0.25dB

Input Impedance 100Ω

Parallel and Serial Gain Control

Power Down Capability

LMH6881应用:

● Oscilloscope Front End

● Spectrum Analyzer Gain Block

● Differential ADC Driver

● Differential Cable Driver

● IF / RF and Baseband Gain Blocks

● Medical Imaging

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LMH6881评估板LMH6881EVAL

The LMH6881EVAL evaluation board is designed to aid in the characterization of Texas Instrument’s High Speed LMH6881 Differential Amplifier.

In order to use the full bandwidth of the LMH6881 the LMH6881EVAL board has been built with a high performance dielectric on the top layer (ROGERS RO4350B). This high performance dielectric provides well matched impedance and low loss to frequencies beyond 1GHz. All signal paths are routed on the top layer. The remainder of the board is conventional FR4.

Use the evaluation board as a guide for high frequency layout and as a tool to aid in device testing and characterization.

评估板LMH6881EVAL主要特性:

Fully assembled

Flexible configuration

High performance Roger’s dielectric

Parallel or serial control

USB to SPI adapter


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详情请见:
http://www.ti.com/lit/ds/symlink/lmh6881.pdf

http://www.ti.com/lit/ug/snau128a/snau128a.pdf



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