Patent ID: 7652445

Claim:
A differential feedback control circuit, comprising: a sense amplifier for sensing a feedback parameter and for generating a differential feedback signal; summing circuitry for producing a differential error signal corresponding to a differential input signal and the differential feedback signal; a differential gain stage, having inputs coupled to the summing circuitry for receiving the differential error signal, and having a pair of outputs presenting an intermediate differential signal responsive to the differential error signal; a differential power amplifier, for generating a differential output signal responsive to the intermediate differential signal; a first compensation network, coupled to the pair of outputs of the differential gain stage, and comprising: at least one capacitor; and a resistor comprised of at least one transistor having a conduction path connected to the at least one capacitor, and having a control terminal; a tuning current circuit for producing a tuning current; and bias circuitry for biasing the control terminal of the at least one transistor in the first compensation network responsive to the tuning current.