Oscillators – Combined with particular output coupling network
Patent
1994-12-20
1996-04-30
Mis, David
Oscillators
Combined with particular output coupling network
331 57, 331177R, H03B 524, H03K 3017, H03K 504
Patent
active
055128610
ABSTRACT:
A ring oscillator buffer stage, supplied by an adjustable current source of an asymmetrical current controlled ring oscillator, is provided for amplifying the output of the ring oscillator. The frequency of the ring oscillator varies as a function of a control signal. The buffer stage includes; a plurality of current controlled buffers, supplied by currents which are controlled in correspondence with the control signal, for amplifying the output of the oscillator; and a buffer for amplifying the output of the current controlled buffers for providing a full-swing output signal with a duty cycle of approximately 50%.
REFERENCES:
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patent: 5117131 (1992-05-01), Ochi et al.
patent: 5136189 (1992-08-01), Demaris
patent: 5175512 (1992-12-01), Self
patent: 5180995 (1993-01-01), Hayashi et al.
patent: 5394038 (1995-02-01), Sobue et al.
patent: 5412258 (1995-05-01), Ogawa et al.
IBM Technical Disclosure Bulletin, vol. 31, No. 2, Jul. 1988, Armonk (New York, US) pp. 154-156 "CMOS Ring Oscillator With Controlled Frequency".
IEEE International Solid State Circuits Conference, vol. 32, Feb. 1989, New York, US pp. 150-151, Scott et al. "A 16 Mb/s Data Detector And Timing Recovery Circuit For Token Ring LAN".
Driscoll David M.
Giunta Richard F.
Mis David
Morris James H.
SGS-Thomson Microelectronics S.A.
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