A high-speed CMOS OP amplifier with a dynamic switching bias circuit

This paper presents a high-speed CMOS OP Amp with a dynamic switching bias circuit capable of processing video signals of over 2 MHz with decreased dissipated power. The OP Amp, capable of operating at 10 MHz dynamic switching rate, was designed and showed through simulations a dissipated power of 66% of that in 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 that in normal operation. Some inaccuracy of the SC amplifier resulted mainly from the limited open gain of the OP Amp. This circuit configuration should be extremely useful in realizing low-power wide-band signal processing ICs.