Premium
Linear frequency networks with applications to ‘frequency set‐on oscillators’ and ‘self‐adaptive bandpass filters’
Author(s) -
Rhodes J. D.
Publication year - 1990
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.4490180203
Subject(s) - band pass filter , electronic engineering , computer science , filter (signal processing) , control theory (sociology) , topology (electrical circuits) , signal (programming language) , physics , electrical engineering , engineering , control (management) , artificial intelligence , programming language , computer vision
Abstract A ‘linear frequency network’ is a network system which consists of an arbitrary connection of devices, each of which performs a linear transformation on the instantaneous frequency of a signal. Thus a transfer function may be defined relating the output to input instantaneous frequency. Particular networks are investigated. the first is a basic section, producing a ‘self‐adaptive bandpass filter’ which is then applied to a ‘frequency set‐on oscillator’. Such an oscillator is a multimode oscillator where any mode will be stable when excited by a sample of an RF pulse adjacent to the mode. Cascading these basic sections results in an n th‐degree ‘self‐adaptive bandpass filter’ producing a bandpass characteristic which tracks a carrier frequency. Experimental devices in the 400‐600 MHz band are shown to have excellent agreement with theory, and applications to digital RF memories, ESM receivers and frequency memory loops are discussed.