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Error reduction in quadrature - polyphase filter with an operational amplifier with a low open loop gain
Error reduction in quadrature - polyphase filter with an operational amplifier with a low open loop gain
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机译:具有低开环增益的具有运算放大器的正交多相滤波器的误差减小
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摘要
A polyphase filter passes a desired frequency and attenuates an image frequency in many communication systems. The invention is an error correction circuit that compensates the polyphase filter for low open loop gain operational amplifiers. When multiple polyphase filters are used in communication circuits on a single integrated circuit (IC), the open loop gain of the operational amplifiers is limited by the IC's ability to dissipate power. The error correction circuit reduces the dependency of the polyphase filter performance on the low open loop gain of its operational amplifiers and hence, on temperature and IC process parameters.
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