Potential of MOS Technologies for Analog Integrated Circuits

Large-scale integrated circuits for many analog and combined analog-digital circuit functions are becoming feasible in N-channel and complementary metal-oxide-semiconductor technologies. Experimental results have been reported for analog to digital and digital to analog converters, a pulse-code-modulation voice encoder-decoder, and precision analog sampled-data frequency filters. Some of the key elements in these MOS circuits are precision-ratioed capacitor arrays, transistor analog switches, internally-compensated operational amplifiers, and offset-nulled comparators.