Wireless phone system with voltage controlled oscillator

A multiple band resonant circuit capable of tuning across a range of resonant frequencies within each band comprising:

• an inductor;
• a switched capacitor connected in series with the inductor;
• a variable circuit whose impedance is determined by a control voltage;
• a first tuning capacitor connecting a first end of the series combination of the inductor and the switched capacitor to a first end of the variable circuit;
• a second tuning capacitor connecting a second end of the series combination of the inductor and switched capacitor to a second end of the variable circuit;
• a first coupling capacitor connected to the junction of the first tuning capacitor and the inductor;
• a second coupling capacitor connected to the junction of the second tuning capacitor and the switched capacitor;
• and
• a switch connected in parallel to the switched capacitor to selectively provide a short circuit connection across the switched capacitor thereby electrically removing the switched capacitor from the resonant circuit.

A multiple band resonant circuit capable of tuning across a range of resonant frequencies within each band comprising:

• an inductor;
• a first coupling capacitor connected to a first end of the inductor;
• a second coupling capacitor connected to a second end of the inductor;
• a switched capacitor;
• a switch connected in series with the switched capacitor, whereby the series combination of the switch and the switched capacitor is connected in parallel to the inductor;
• a variable circuit whose impedance is determined by a control voltage;
• a first tuning capacitor connecting the first end of the inductor to a first end of the variable circuit;
• and
• a second tuning capacitor connecting the second end of the inductor to a second end of the variable circuit;
• wherein the switched capacitor contributes to the resonant frequency of the resonant circuit when the switch is enabled and the switched capacitor does not contribute to the resonant frequency of the resonant circuit when the switch is disabled.