Patent ID: 7167058

Claim:
A variable frequency oscillator, comprising: a temperature compensation input node; a frequency control input node; a resonant circuit including: a first tunable sub-circuit responsive to said temperature compensation input node for modifying the resonant frequency of said resonant circuit; a second tunable sub-circuit responsive to said frequency control input node for modifying the resonant frequency of said resonant circuit; wherein in normal use, said first tunable sub-circuit continuously responds to said temperature compensation input node to compensate for resonant drifts in said resonant circuit due to temperature variations while said second tunable sub-circuit continuously responds to varying frequency modification signals at said frequency control input node; a temperature compensation circuit coupled to said temperature compensation input, and effective for continuously producing a temperature compensation signal in accordance with temperature variations, said temperature compensation circuit including: a plurality of first modules each effective for producing a respective first signal directly proportional to temperature; a plurality of second modules each effective for producing a respective second signal inversely proportional to temperature; a first summing node for summing all of said first and second signals and producing a resultant summed signal.