Precision High Frequency Applications of Analog Solid-State Switch
Original Publication Date: 1985-Jun-01
Included in the Prior Art Database: 2005-Feb-18
The resistance of analog solid state switches varies with the voltage applied to the switches. This limits the precision of these switches and, consequently, their application. The precision of the switches can be substantially improved by connecting two of the switches together differentially. The figure shows a pair of analog solid state switches in a differential configuration. Two matched CMOS high frequency switches are shown schematically at 12 and 14 in the figure. Devices 12 and 14 comprise "series/shunt" switches consisting of switches 12a and 14a respectively, switches 12b and 14b respectively, and switches 12c and 14c respectively. Devices 12 and 14 are switched on and off by a control voltage applied at terminals 1 and 9. A differential input signal is applied to amplifier 16 over lines 17 and 18.