| 摘要 |
An amplifying and switching unit in the circuit includes: a switching control unit(20) for generating an output current with a RF modulator(35) driving voltage; and a switchable amplifier(10) for producing the third. RF signal(RF3), which is modulated by the modulator while being turned on/off in accordance with the output currents of the switching control unit, and the first. RF signal(RF1), which is an amplified antenna signal, selectively without interference; thereby preventing the playing signal of VCR from mixing with the antenna signal when the signal is output to TV.
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