Microwave frequency synthesizer utilizing a combination of a phase locked loop and frequency translation techniques

摘要

A microwave frequency synthesizer utilizing a phase locked loop for generating a wide range of microwave frequencies in response to a control signal, in combination with a network including a plurality of distinct frequency local oscillators that are appropriately selectable for mixing with the signal output of the phase locked loop for translating it into a desired range, thereby expanding the effective frequency range of the phase locked loop. The combination provides a stable source of microwave frequency signals over a wide frequency range. The combination allows a simple, low cost circuit implementation and may be switched between output frequencies at a very fast speed.