A circuit provides power supply noise cancellation by utilizing a correction capacitor coupled to a compensation input of the circuit. Power supply noise is introduced into an output of the circuit by inadvertently coupling an error voltage thru a capacitor to the output as a result of power supply voltage...http://www.google.com.au/patents/US4912427?utm_source=gb-gplus-sharePatent US4912427 - Power supply noise rejection technique for amplifiers
