Patent ID: 7206565

Claim:
A wideband frequency generating apparatus in a tuner, comprises: an oscillator unit generating a predetermined frequency signal from a minimum frequency of the oscillator fmin to a maximum frequency of the oscillator fmax wherein: fmax> 4/3 fmin, fmax> 12/10 fmin, fmax> 5/4 fmin a mixer having a first input and a second input, the first input coupled to the oscillator unit to generate a difference signal by mixing the predetermined frequency signal of the oscillator unit with a signal inputted to the second input; an output terminal; a first switch tuned on/off and transmitting the predetermined frequency signal to the output terminal without substantive signal processing; a second switch turned on/off and transmitting the difference signal of the mixer to the second input of the mixer to form a feedback loop; a ½ frequency divider dividing the difference signal of the mixer into a ½ frequency signal; a third switch tuned on/off and transmitting the ½ frequency signal to the second input of the mixer; and a control logic unit generating on/off control signals turning on/off the mixer, the first switch, the second switch, the third switch in accordance with a selection of frequency generating ranges.