METHOD AND APPARATUS FOR REDUCTION OF TRANSMITTER-CHAIN NOISE IN PORTABLE DUPLEX TRANSCEIVERS

摘要

Reduction of transmitter exciter chain generated noise from the receive band of a portable/hand-held duplex transceiver is achieved using a high output power, low-noise voltage-controlled oscillator (VCO) in the transmitter exciter chain. Using this high-power, low-noise oscillator as the RF source in the transmitter exciter chain precludes the need for the conventional buffer/driver amplifier stage and an associated inter-stage noise filter. Elimination of buffer/driver stage components and bulky inter-stage noise filter components allows complete integration of transmitter exciter chain components resulting in reduced size and cost.