| 摘要 |
PROBLEM TO BE SOLVED: To provide an IC input circuit for a tuner, which can reduce beat disturbance. SOLUTION: The circuit has a mixer which is composed of a Gilbert cel and has two input terminals for an RF signal, a local oscillation circuit which provides an oscillation frequency for converting the RF signal into a 1st intermediate-frequency signal for a mixing circuit, and a trailing-stage circuit which detects the 1st intermediate-frequency signal or converts it into a 2nd intermediate frequency signal. The mixer, the local oscillation circuit, and the trailing-stage circuit are formed on one and the same IC chip. The trailing-stage circuit has an oscillation circuit part.
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