Level control circuit for portable radio communication...

H - Electricity – 04 – B

Patent

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Details

H04B 1/18 (2006.01) H03G 3/30 (2006.01)

Patent

CA 2163961

A compact level control circuit without using a shield structure is suitably provided in a small space such as a portable radio communication apparatus. A level control circuit for a portable radio communication apparatus arranged by: a first variable attenuator into which an input RF (radio frequency) signal is supplied, the attenuation amount of which is controlled based upon a first level control signal, and which outputs a first attenuated RF signal; a frequency converter for frequency-converting the first attenuated RF signal into a predetermined intermediate frequency band signal to thereby output a first IF (intermediate frequency) signal; a second variable attenuator into which the first IF signal is supplied, the attenuation amount of which is controlled based on the first level control signal, and which outputs a second attenuated IF signal; and a bandpass filter for outputting only said predetermined intermediate frequency band component of the second attenuated IF signal.

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