Patent Number: 8,791,682

Title: Noise rejecting high-side power switch

Abstract: An apparatus includes a pass element comprising an input, an output and a control input. The pass element, with a first signal on the control input, passes a voltage from the input to the output and, with a second signal on the control input, blocks the voltage on the input from passing to the output. A differential amplifier includes a non-inverting input coupled to the input, an inverting input coupled to the output, an amplifier output coupled to the control input and a bias current connection. The differential amplifier, with a bias current supplied, supplies the first signal along with a closed feedback loop from the output and supplies the second signal in absence of the bias current. A current source is coupled to the bias current connection and an enable input. The current source supplies the bias current and, in absence of an enable signal, disables the bias current.

Inventors: Deng; Qi (San Jose, CA)


International Classification: G05F 3/04 (20060101); G05F 3/08 (20060101)

Expiration Date: 7/29/12018