Compensation for parameter variations in a feedback circuit

摘要

Techniques to compensate for parameter variations in a feedback circuit are disclosed. In one embodiment, a regulator circuit includes an energy source (103) coupled to output a generated current (I G ) in response to a control current (I C ). A feedback resistor (101) is coupled to an output (100) of the regulator circuit. The feedback resistor (101) is coupled to conduct a feedback current responsive to the output of the regulator circuit. A current amplifier (126) is coupled to the feedback resistor (101) to generate the control current in response to the feedback current. A compensation network (130) is coupled to the current amplifier (126) to adjust the control current in response to an extrinsic parameter of the regulator circuit. The compensation network (130) includes a transistor and first, second and third resistors. The first resistor is coupled between the feedback resistor (101) and a collector of the transistor. The second resistor is coupled between the collector and the base of the transistor. The third resistor is coupled between the base and an emitter of the transistor.