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运算跨导放大器(简称OTA)是一种有广泛应用前景的有源器件。近年来,在电路和系统设计中,国内外电路设计者对OTA的兴趣越来越浓,主要原因是:(1)OTA的输出量不是电压,而是电流。某些信号处理功能(例如求和、积分)用电流信号来实现,比用电压信号简便得多;(2)与通常型运放(OP-AMP)比较,OTA的电路结构简单,高频性能良好,能对高频(例如高于1MHz)信号作连续时间方式处理,而不必采用离散时间采样处理等复杂技术;(3)OTA比通常运放多一个信号控制端,其增益连续可调,便于实现增益、频
Transconductance amplifier (OTA) is an active device with a wide range of applications. In recent years, circuit and system design, circuit designers at home and abroad interest in OTA more and more concentrated, mainly due to: (1) OTA output is not voltage, but current. Some signal processing functions (such as summing and integrating) are implemented with current signals, which are much easier than using voltage signals. (2) Compared with the OP-AMP, the OTA circuit has a simple structure and high frequency performance Good, high-frequency (for example, higher than 1MHz) signal for continuous-time processing, without the need for discrete time sampling processing and other complex technologies; (3) OTA than the usual op amp more than one signal control terminal, the gain continuously adjustable, Easy to achieve gain, frequency