Patent ID: 7672651
Filing Date: 2010-03-02
Classification: H04N

Abstract:
1. A tuner circuit comprising: a pre-filter receiving a received high frequency signal, and outputting a high frequency signal having a desired frequency band; a local oscillator generating a local oscillation signal; a first frequency conversion circuit receiving a high frequency signal outputted from the pre-filter and the local oscillation signal to output a signal having a difference frequency component between said both signals; an intermediate frequency filter receiving an output signal of the first frequency conversion circuit, and selectively passing a signal having a desired intermediate frequency band to output an intermediate frequency signal; a second frequency conversion circuit receiving a high frequency signal outputted from the pre-filter and the local oscillation signal to output a signal having a difference frequency component between said both signals; and an amplifier receiving the intermediate frequency signal and an output signal of the second frequency conversion circuit to select and amplify any one of said both signals, and thereafter, to output the selected and amplified signal.