Patent ID: 7385439
Filing Date: 2008-06-10
Classification: H01L,H03H

Abstract:
1. An analog switch for a switched capacitor filter that is supplied with a predetermined reference voltage and that maintains respective input and output terminals of said analog switch at said reference voltage, the analog switch comprising an N-channel MOS FET (metal-oxide semiconductor field effect transistor) and a P-channel MOS FET connected in parallel between an input terminal and an output terminal of the analog switch, said N-channel MOS FET and said P-channel MOS FET being respectively formed within a first transistor formation region and a second transistor formation region that are disposed in common within a semiconductor substrate of a single integrated circuit, and comprising a first substrate potential-setting input terminal adapted to connect said first transistor formation region to an externally supplied voltage and a second substrate potential-setting input terminal adapted to connect said second transistor formation region to said externally supplied voltage; wherein said reference voltage is supplied to each of said first substrate potential-setting input terminal and said second substrate potential-setting input terminal, for thereby fixing respective potentials of said transistor formation region of said N-channel MOS FET and of said transistor formation region of said P-channel MOS FET at said reference voltage.