Patent ID: 7123105

Claim:
A temperature-controlled oscillator, comprising: an oscillator circuit including; a capacitor device; a current source for supplying a current to the capacitor device, wherein the current source comprises an input that receives a first temperature control signal, an output that supplies an output current that is connected to a first terminal of the capacitor device, a first plurality of P-type transistors whose gates are connected together and whose sources are connected together, a plurality of N-type transistors whose gates are connected together, and wherein a drain of one of the N-type transistors is connected to the gates of the first plurality of P-type transistors and a drain of one of the N-type transistors is connected to the gates of the N-type transistors, and a second plurality of P-type transistors having sources that are connected to drains of a subset of the first plurality of P-type transistors, and wherein a drain of one of the second plurality of P-type transistors is connected to the input that receives the first temperature control signal that controls the output current supplied at the output of the current source; a comparator that has first and second inputs and an output, the first input of the comparator being connected to a reference voltage and the second input being connected to said first terminal of the capacitor device, wherein the comparator generates a signal at its output when the voltage at the second input is eciual to the reference voltage; a control circuit having an input connected to the output of the comparator and an output connected to the second input of the comparator to reset the oscillator circuit when the voltage at the second comparator input is equal to the reference voltage; and a frequency divider connected to the output of the comparator, wherein the frequency divider comprises a plurality of multipliers, each of which multiplies by a different multiplier value when selected by a corresponding temperature control signal; wherein the oscillator circuit is responsive to the first temperature control signal to produce the output signal of the comparator that has a frequency at a multiplier value that is different than the multiplier values generated by the frequency divider.