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The use of multi-pole bandpass filters and other multiple resonator circuitry as oscillator frequency stabilization elements

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1 Author(s)
M. M. Driscoll ; Northrop Grumman Corp., Baltimore, MD, USA

This paper describes the design considerations and tradeoffs involved in the use of multi-pole bandpass filters and other cascaded resonator structures as oscillator frequency stabilization elements. Oscillator signal near-carrier noise is minimized when the oscillator loop group delay is large. A comparison has been made between single-pole and multi-pole bandpass filters and other multiple resonator circuits with regard to the most efficient way of obtaining maximum, net group delay at a given insertion loss. As an example, at 12 dB net insertion loss, a two-pole filter provides approximately the same group delay as either a higher order filter or an isolated cascade of two, 6 dB insertion loss, single-pole filters. Calculated results for variable order (number of poles), fixed loss filters are provided in terms of normalized group delay, amplitude response bandwidth, and group delay “flatness” bandwidth

Published in:

Frequency Control Symposium, 1996. 50th., Proceedings of the 1996 IEEE International.

Date of Conference:

5-7 Jun 1996