Patent ID: 6320913
Filing Date: 2001-11-20
Classification: H03F,H03G

Abstract:
A transmission amplifier control circuit comprising:plural amplification means;switching means for selectively switching at least one of said plural amplification means;detection means for detecting a timing at which said plural amplification means are switched, using the format of data to be transmitted during data transmission;amplification changeover control means for controlling a timing for switching said plural amplification means, using both a detection signal from said detection means and an output power control signal which is externally input and controls the output power of said transmission amplifier control circuit; anda signal processing section connected to said plural amplification means, the signal processing section controlling said data according to a variable gain control signal from said amplification changeover control means, wherein said signal processing section comprises:a modulation circuit for modulating said data to output a modulation signal,an intermediate frequency variable gain amplifier for controlling said modulation signal according to said variable gain control signal, anda frequency conversion circuit for converting a signal output from said intermediate frequency variable gain amplifier into a signal of desired frequency.