Operational characteristics of CMOS op-amps at cryogenic temperatures

The gain-bandwidth product, slew rate and power dissipation of four commercially available CMOS operational amplifiers were measured as a function of temperature between 77 and 300 K. The measurements were made with the circuits in continuous operation. A marked improvement in the gain-bandwidth product and slew rate were measured as the temperature was lowered but there was a corresponding increase in the power dissipated. With a 5 V supply, …