Switchable frequency ring oscillator

Details Switchable frequency ring oscillator Switchable frequency ring oscillator

1998-07-08

1999-12-28

Grimm, Siegfried H.

Oscillators

Polyphase output

331 57, 331179, H03B 502

Patent

active

060087005

ABSTRACT:
In digital signal processing, it is necessary to work with system clocks. This often requires the use of different system clocks which have a corresponding accuracy. In a ring oscillator circuit having an even number of ring inverters caused to oscillate by the same number of shunt inverters, a stepwise change of the frequency is achieved by switching additional inverters. By switching between two modes, several multiples of a fundamental frequency can be adjusted. By merely switching the additional inverters, the current consumption at each adjusted frequency remains constant. This has the advantage that the frequency thus generated is very stable and, hence, corresponds to the accuracy requirements imposed on digital signal processing. Moreover, this system is operated via a current supply so that a further improvement of the accuracy and freedom from interference of the generated frequencies is achieved. The use of inverters operating with MOSFETs is possible because these ring oscillators are integrable and can thus be combined to complex circuits in digital signal processing. The number of phases of the ring oscillator determines the gradation of the individual frequencies. The higher the number of phases, which must be a multiple of four, the more gradations can be obtained.

REFERENCES:
patent: 4105950 (1978-08-01), Dingwall
patent: 4517532 (1985-05-01), Neidorff
patent: 5592126 (1997-01-01), Boudewijns et al.
patent: 5592127 (1997-01-01), Mizuno

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