Patent ID: 7348860

Claim:
A relaxation oscillator, comprising: a load device, configured to provide a variable oscillator output based on a variable input reference voltage; a switching device, connected in signal communication with said load device, configured to become active and inactive based on the variable oscillator output; a fine-tuning varactor, connected in signal communication with said switching device, configured to provide fine-tuning of the variable oscillator output when said switching device is active; and a current source, connected in signal communication with said switching device, and configured to provide coarse-tuning of the variable oscillator output when said switching device is active, wherein said fine-tuning varactor comprises at least one capacitor configured without a corresponding inductor to provide the fine-tuning of the variable oscillator output in response to an analog input voltage provided via a control input of said fine-tuning varactor when said switching device is active.