Ring oscillator having bandpass filters between stages

Details Ring oscillator having bandpass filters between stages Ring oscillator having bandpass filters between stages

1994-06-17

1995-05-30

Grimm, Siegfried H.

Oscillators

Ring oscillators

331135, 331177R, H03B 502, H03K 3282

Patent

active

054205476

ABSTRACT:
A ring oscillator giving oscillation with a high, stable Q value. The ring oscillator is constituted by gain-stages connected by lowpass filters consisting of a resistance element and a capacitive element connected in series and is provided with transconductance circuits including transistors parallel to the capacitive elements of the lowpass filters. By passing currents proportional to signal voltages differing .theta. in phase, it is possible to operate the low pass filters as bandpass filters. By this, oscillation with a high, stable Q value is obtained. The ring oscillator can be modified to a voltage controlled oscillator by using variable current sources.

REFERENCES:
patent: 4337529 (1982-06-01), Morokawa
patent: 5191301 (1993-03-01), Mullgrav, Jr.
patent: 5315547 (1994-05-01), Shoji et al.

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