Patent ID: 6509722
Filing Date: 2003-01-21
Classification: G05F,H03F

Abstract:
An amplifier having dynamic input stage biasing, the amplifier comprising:an input stage operatively coupled to an input of the amplifier; a controlled current source operatively coupled to the input stage, the controlled current source-being responsive to a control signal for at least partially controlling an input bias current generated by the controlled current source; an output device operatively coupled to an output of the amplifier, the output device supplying an output load current at least when the amplifier is loaded which is responsive to an input signal presented to the output device; and a sense circuit operatively connected in a feedback arrangement between the output device and the controlled current source, the sense circuit measuring at least a portion of the input signal presented to the output device and generating the control signal that is representative thereof; whereby the input bias current is dynamically controlled as a function of the input signal presented to the output device.