CDMA TRANSMITTER FOR ATTENUATING RECEIVING FREQUENCY BAND NOISE OUTPUT

摘要

PURPOSE: A CDMA transmitter for attenuating receiving frequency band noise output is provided to remove receiving frequency band noise from a signal transmitted from a transmitting unit. CONSTITUTION: A CDMA transmitter comprises 2 LC filters(320,340). The LC filters(320,340) remove a receiving frequency band signal from a signal outputted from an AGC(Automatic Gain Control) amplifier(310). The first LC filter(320) is configured between the AGC amplifier(310) and a resistance attenuator(330). The second LC filter(340) is configured between the resistance attenuator(330) and an up-converter(350). The AGC amplifier(310) adjusts and outputs the gain of an intermediate frequency input signal. The resistance attenuator(330) attenuates the signal outputted from the AGC amplifier(310). The up-converter(350) converts the signal outputted from the resistance attenuator(330) into a transmitting frequency band signal.