Patent ID: 7283796

Claim:
An electronic tuning system comprising: a voltage controlled oscillator for generating a local frequency signal having a frequency according to a predetermined control voltage; an electronic tuner coupled to the voltage controlled oscillator for adjusting the predetermined control voltage to tune the local frequency signal to radio waves on an arbitrary channel in accordance with channel selection information; a booster circuit coupled to the voltage controlled oscillator for boosting a source voltage to generate a boosted voltage in order to ensure the predetermined control voltage, wherein the booster circuit includes, a coil coupled to a power source; a switching element coupled to the coil for periodically conducting a DC current flowing through the coil to a ground to change the DC current; a zener diode coupled to the coil for clamping an electromotive force induced in the coil in accordance with a change in the DC current flowing through the coil to a predetermined voltage; and a capacitor for smoothing the clamped voltage to generate a boosted-voltage; and a non-volatile memory for storing the channel selection information in response to a predetermined write voltage, wherein the boosted voltage of the booster circuit is utilized as the predetermined write voltage, wherein the capacitor is coupled between the non-volatile memory and a node between the zener diode and the voltage controlled oscillator.