Abstract: A method and apparatus for a voltage reference is provided. The circuit may include one or more of the following features: cascode compensation with load balancing to increase the bandwidth of the amplifier for enhanced power supply rejection ratio; PMOS and NMOS in the input stage to expand common mode, having a high gain over voltage range; current mirror using active resistors; and a start-up circuit. The voltage reference comprises an amplifier having an output, the amplifier comprising a first amplifier stage and a second amplifier stage. The amplifier further includes a power-down circuit coupled to the second amplifier stage to float the amplifier output when a power-down signal is active. The voltage reference includes a source follower, the output of the amplifier coupled to the gate of the source follower, and a bandgap circuit for providing a bandgap voltage.
Type:
Grant
Filed:
September 9, 1999
Date of Patent:
September 12, 2000
Assignee:
Mars Technology, Inc.
Inventors:
Amar S. Manohar, Bor Lee, Vincent Condito