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THE USE OF RAMPED ATTENUATION TO REDUCE VOLTAGE CONTROLLED OSCILLATOR LOAD-PULLING EFFECTS DURING THE SWITCHING OF A PHASE-LOCKED LOOP

IP.com Disclosure Number: IPCOM000008134D
Original Publication Date: 1997-Jun-01
Included in the Prior Art Database: 2002-May-21

Publishing Venue

Motorola

Related People

Authors:
Neil Turner Nigel Tolson

Abstract

This paper is concerned with the use of a vari- important. One particular environment where the able attenuator to reduce the effects of voltage-con- principle may be applied is that of a frequency hop- trolled oscillator 'load-pull.' It is relevant to any ping system where two synthesisers are switched in system that switches a voltage controlled oscillator a 'ping-pang' arrangement. (VCO) in an environment where phase accuracy is vco ) In PLL Isolation Switch > output L Fig. 1 Consider the system in Figure 1. The voltage controlled oscillator signal is passed to a switch, and then to the output.