Patent ID: 7034627

Claim:
An oscillator circuit, comprising: a variable current source that is arranged to provide a reference current, wherein the reference current is dependent on at least one of temperature and a supply voltage; a current mirror that is coupled to the variable current source and operable to mirror the reference current across a resistive element to produce a reference voltage wherein a value of the resistive element is relatively independent of temperature; a switch circuit that is coupled between the current mirror and a capacitive circuit, wherein the switch circuit is operable to periodically charge and discharge the capacitive circuit; and a switch control circuit that is coupled to the reference voltage and coupled to the capacitive circuit, wherein the periodic charging and discharging of the capacitive circuit is employed by the switch control circuit to provide an oscillating output signal that is relatively independent of a change in temperature and a change in the supply voltage, wherein the switch circuit further comprises a switch element that is coupled between the capacitive circuit and the current mirror and another switch element that is coupled between the capacitive circuit and ground.