High frequency device

A tuner high frequency device, comprising:

• a first filter for extracting signal components in a predetermined frequency band from an input signal having a radio frequency;
• a frequency converter for converting a frequency of the signal components extracted by the first filter to thereby obtain an IF signal, in which a frequency changing amount is variably controlled according to a frequency of a signal input from an RF-stage section so that IF signals having a constant frequency are obtained;
• a second filter for extracting signal components in a predetermined frequency band from the IF signal obtained by the frequency converter;
• a bypass circuit for detouring the second filter downstream of the first filter;
• a switching mechanism including a switching circuit for switching connection of a signal path downstream of the first filter to either the second filter or the bypass circuit.

An integrated circuit, comprising:

• a frequency converter for converting frequency of signal components extracted using a first filter which extracts signal components in a predetermined frequency band from an input signal;
• a bypass circuit provided downstream of the first filter, for detouring a second filter which extracts signal components in a predetermined frequency band from the signal components with a frequency thereof converted by the frequency converter;
• and
• a switching mechanism including a switching circuit for switching connection of a signal path downstream of the first filter to either the second filter or the bypass circuit.