Patent ID: 7825720
Filing Date: 2010-11-02
Classification: G05F,G11C

Abstract:
1. A circuit for providing an operating voltage comprising: a first transistor having a first current electrode coupled to a first supply voltage terminal, a second current electrode coupled to a virtual supply voltage node, and a control electrode; a second transistor having a first current electrode coupled to the first supply voltage terminal, a second current electrode, and a control electrode coupled to the virtual supply voltage node; a first load having an input coupled to a second supply voltage terminal, an output coupled to the second current electrode of the second transistor, and a control input; a third transistor having a first current electrode, a control electrode coupled to the output of the first load, and a second current electrode coupled to the second supply voltage terminal; a second load having an input coupled to the first supply voltage terminal, an output coupled to the control electrode of the first transistor and the first current electrode of the third transistor, and a control input; a bias network coupled to provide a first bias voltage to the control input of the first load and a second bias voltage to the control input of the second load; and a circuit module having a first power terminal coupled to the virtual supply voltage node and a second power terminal coupled to the second supply voltage terminal, wherein the virtual supply voltage node provides the operating voltage to the circuit module.