2013 Volume 6 Issue 6 Pages 376-380
This paper presents a high-speed CMOS operational amplifier (OP Amp) with a dynamic switching bias circuit, capable of processing video signals of over 2 MHz with decreased dissipated power. The OP Amp was designed to operate at a 10 MHz dynamic switching rate, and was shown in simulations to have a dissipated power of 66 % of conventional continuous operation. This OP Amp was applied to a switched capacitor (SC) non-inverting amplifier with a gain of 2, and its high-speed 10 MHz dynamic switching operation, capable of processing video signals, was demonstrated. By increasing the switching duty ratio to 70 %, its power dissipation decreased to 56 % of normal operation. Some inaccuracy in the SC amplifier performance resulted mainly from the limited open loop gain of the OP Amp. This circuit configuration should be extremely useful in realizing low-power wide-band signal processing ICs.