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FREQUENCY SYNTHESIZER WITH FINE FREQUENCY RESOLUTION AND NOISE CANCELLATION

IP.com Disclosure Number: IPCOM000006659D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2002-Jan-21

Publishing Venue

Motorola

Related People

Authors:
James E. Klekotka

Abstract

An approach to providing a low-noise RF signal synthesizer having fme frequency resolution and meet- ing the noise performance requirements for a satellite terminal is illustrated in Figure 1. Signals from an,exter- nal reference oscillator are delivered by connections 1 and 2 to frequency dividers 3 and 4, respectively. Divi- sors for hequency dividers 3 and 4 are Rl and R2, respec- tively, where Rl + 1 = R2. Frequencies at 5 and 6 thus are Rl and R2 times the interchannel frequency separa- tion FICFS, providing the desired FICFS. Bandwidths of loops LOOP1 and LOOP2 can be increased by factors Rl and R2, allowing faster loop frequency change, pro- viding improved noise performance and permitting wider drift cancellation loop bandwidth.