Patent ID: 9661695
Date: 2017-05-23
CPC Classifications: H03F,H03K,H05B,Y02B

Claim:
1. An error-sensing current-compensating driver circuit comprising: an output transistor having a gate driven by a gate node to generate an output current on an output node; a sense-source transistor that generates a first source current; a sensing transistor that conducts the first source current to the output node, wherein a gate of the sensing transistor and a node between the sense-source transistor and the sensing transistor are connected together as a first mirror node; a sense mirror transistor conducting current between a second mirror node and a tail node in response to a gate receiving the first mirror node; a sense-mirror middle transistor for conducting a current to the second mirror node; a sense-mirror tail transistor for conducting current from the tail node; a reference source transistor for conducting a mirrored sense current in response to a gate receiving the second mirror node; a reference current source for generating a reference current; an error-storing capacitor having a combining node that stores as charge a difference between the reference current and the mirrored sense current; a feedback source transistor having a gate receiving the combining node, for generating a feedback compensation current to the gate node; and a feedback-driving transistor having a gate and a drain connected to the gate node, wherein the feedback compensation current flows through the feedback-driving transistor to generate a voltage of the gate node to the output transistor.