In discrete time analog signal processing, flowting CMOS analog switches (transmission gate) can't be utilized for low power supply voltage, because of the threshold voltages. In this paper we propose a 3-state (input, output, Hi-impedance) Current-Memory which make flowting analog switches unnecessary and make it possible the discrete-time analog signal processing with low power supply voltage. It uses only granded analog switch, and a common gate circuit to realize low input impedance. We apply it to A/D converter and Sampled-data filter by using Switched-Current (SI) technique. The performance of the proposed circuits are confirmed by Hspice Simulation.
