Device for generating wide tunable frequency using frequency divider

A wideband frequency generating apparatus in a tuner, comprises:

• an oscillator unit generating a frequency signal having a predetermined frequency range;
• an output terminal;
• a first switch tuned on/off and transmitting the frequency signal of the oscillator unit to the output terminal to output an output signal;
• a mixer having a first input and a second input, the first input coupled to the oscillator unit to receive the frequency signal of the oscillator unit and generating a sum signal and a difference signal by mixing the frequency signal of the oscillator unit with a signal inputted to the second input of the mixer;
• second and third switches turned on/off and each coupled to the mixer to receive one of the sum and different signal;
• a first band pass filter disposed between the second switch and the output terminal to pass a ⅘ frequency signal from the one of the sum and different signals;
• a second band pass filter disposed between the third switch and the output terminal to pass a {fraction (4/3)} frequency signal from the one of the sum and different signal;
• a ¼ frequency divider coupled to the first and second band pass filters to divide one of the ⅘ frequency and the {fraction (4/3)} frequency signal into a ¼ frequency signal;
• a fourth switch transmitting the ¼ frequency signal of the ¼ frequency divider to the second input of the mixer 203;
• and
• a control logic unit generating control signals in response to a selection of frequency tuning ranges to turn on and off the first through fourth switches, the mixer, the first and second band pass filters, and the frequency divider 208.

A wideband frequency generating apparatus in a tuner, comprises:

• an oscillator unit generating a frequency signal having an input frequency range;
• and
• a tuning range expanding circuit unit comprising:
• a mixer having a first input port coupled to the oscillator, a second input port, and an output port coupled to the output terminal, and mixing the frequency signal inputted to the first input port with a feedback signal inputted to the second input port to generate an output signal having an output frequency range, and
• a frequency divider having an input end coupled between the output port of the mixer and the output terminal, having an output end coupled to the second input port of the mixer to form a feedback loop, having a frequency dividing ratio, and dividing the output signal into the feedback signal using the dividing ratio.