NS LMH6522高性能四路数控可编增益(DVGA)放大方案
NS公司的LMH6522是高性能四路数控可编增益(DVGA)放大器,-3dB带宽1400MHz,电压26dB,增益可编1dB/步,200MHz的OIP3为49dBm,噪音为8.5dB,可进行并联和串联增益控制,主要用在蜂窝基站,宽带和窄带IF取样接收器,宽带直接变换和ADC驱动器.本文介绍了LMH6522主要特性,方框图, 基本连接电路图, 典型应用电路图以及LMH6522EVAL评估板输入和输出电路, 逻辑插头电路图, 信号通路电路和评估板元件布局图.
The LMH6522 contains four, high performance, digitally controlled variable gain amplifiers (DVGA). It has been designed for use in narrowband and broadband IF sampling applications.
Typically, the LMH6522 drives a high performance ADC in a broad range of mixed signal and digital communication applications such as mobile radio and cellular base stations where automatic gain control (AGC) is required to increase system dynamic range.
Each channel of LMH6522 has an independent, digitally controlled attenuator and a high linearity, differential output, amplifier.
All circuitry has been optimized for low distortion and maximum system design flexibility. Power consumption is managed by a three-state enable pin. Individual channels can be disabled or placed into a Low Power Mode or a higher performance, High Power Mode.
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