一种用于视频信号处理的高速宽带运算放大器

基于高速亚微米互补双极工艺,设计了一种用于视频信号处理的高速宽带运算放大器。电路内部采用高速输入差分对、电流型放大单元、Rail-to-Rail输出单元等结构进行信号传输和放大。对开环增益提升、高速电压-电流信号转换、满摆幅输出设计以及频率稳定性补偿等关键技术进行分析,利用Spectre软件进行仿真。流片后的测试结果表明,在±5 V工作电压下,该放大器的－3 dB带宽≥200 MHz,失调电压≤5 mV,电源电流≤6 mA,满足高速通信、高速ADC前端信号采集、视频信号处理等各种场合的应用需求。

A High Speed Broadband Operational Amplifier for Video Signal Processing

Based on high speed submicron complementary bipolar process, a high speed broadband operational amplifier for video signal processing was presented. High speed input differential pairs, current mode amplification units, rail-to-rail output units and other structures were used for signal transmission and amplification. The key technologies of operational amplifier design, such as open loop gain boost, high speed V-I conversion, full swing output unit design and frequency stability compensation, were analyzed. The proposed circuit was simulated by Spectre tools. It was taped out and tested. Tested results indicated that the circuit had a-3 dB bandwidth of more than 200 MHz, an offset voltage of less than 5 mV, a supply current of less than 6 mA at ±5 V power supplies. It met the requirements of several applications such as high speed communication, high speed A/D signal acquisition and video signal processing.