In a television tuner, a predetermined bias voltage is applied to the anode of a first switching diode. A power supply voltage is applied to the collector of a switching transistor via a power supply resistor, and the emitter of the switching transistor is grounded. The collector of the switching transistor...http://www.google.com/patents/US6903783?utm_source=gb-gplus-sharePatent US6903783 - Tuner for receiving television signal in VHF band and UHF band
