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