Patent ID: 6621342
Filing Date: 2003-09-16
Classification: H03F

Abstract:
An integrated circuit device comprising:a high voltage power supply; and a rail to rail input/output operational amplifier comprising: a dynamic cascode bias generator to provide a first bias voltage to control a first set of cascode transistors and a second bias voltage to control cascode transistors, said first bias voltage to increase towards a power supply voltage in response to a first common mode input voltage increasing above a first reference value and said second bias voltage to decrease towards a ground potential in response to a second common mode input voltage decreasing below a second reference value; an N type differential amplifier coupled to said dynamic cascode bias generator, said N type differential amplifier to have said first common mode input voltage across its inputs; and a P type differential amplifier coupled to said dynamic cascode bias generator, said P type differential amplifier to have said second common mode input voltage across its inputs.