Patent ID: 7365610

Claim:
A method comprising: reducing variation in output of an oscillator circuit caused by variation in a supply voltage for the oscillator circuit, by offsetting a change in a value of a first capacitance in a first direction in response to the variation in the supply voltage with a diode structure having a capacitance that changes in a second direction, opposite the first direction, in response to the variation in the supply voltage, wherein the diode structure is sized to offset changes in capacitance around a nominal supply voltage substantially linearly in a region around the nominal supply voltage, wherein the diode structure comprises a transistor coupled to the first capacitance and a first power supply node, wherein the transistor is a metal oxide semiconductor (MOS) transistor, having a channel region of a first conductivity type, and wherein the diode structure further comprises another transistor having a channel region of a second conductivity type and coupled to a second power supply node.