| 摘要 |
PURPOSE:To simplify the mounting by providing a time constant switching means in an integrated circuit so as to reduce an externally mount component. CONSTITUTION:The 1st and 2nd AGC amplifiers 2, 3 receiving an input signal (intermediate frequency signal) in common, a 1st switch circuit SW1 connected to each output terminal of the two 1st and 2nd AGC amplifiers 2, 3, a 1st resistor R1 connected between the output end and ground end of the 1st AGC amplifier 2, and the series circuit comprising the 2nd resistor R2 connected in parallel with the 1st resistor R1 and the 2nd switch circuit SW2 are provided to the inside of the integrated circuit 1. Then, the 1st and 2nd switch circuits SW1, SW2 are subject to simultaneous switch control. Thus, only one capacitor is required for a component mounted externally to the AGC terminal thereby simplifying the mounting.
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