TWO-TERMINAL IMPEDANCE CIRCUIT

摘要

PURPOSE:To reduce the influence of a delay time though a digital circuit is not made high-speed neither high-power by connecting an analog processing circuit in parallel with a digital processing circuit and allowing signals having relatively low frequency components to pass through the digital processing circuit and allowing signals having relatively high frequency components to pass through the analog provessing circuit. CONSTITUTION:Inputs of a differential amplifier circuit 3 are connected two terminals 1 and 2, and the output of the circuit 3 is connected to the input of an analog-digital converting circuit 5 through a prefilter 11. The output of this analog-digital converting circuit 5 is applied to a digital processing circuit 6 to execute a processing with a prescribed transfer function. The output digital signal is converted to an analog signal by a digital-analog converting circuit 7 and is fed back and connected to said terminals 1 and 2 from an output amplifier circut 9 through a postfilter 12. An analog processing circuit 13 is connected between the output of the differentail amplifier circuit 3 and the input of the output amplifier circuit 9 to form a double loop, and the processing is executed with a prescribed transfer function by the analog signal.