Oscillators – Ring oscillators
Patent
1995-07-12
1996-06-11
Mis, David
Oscillators
Ring oscillators
331179, 327107, H03B 524, H03K 3012, H03K 3027
Patent
active
055259391
ABSTRACT:
In a digital control pulse generator including a ring oscillator composed of multiple inversion circuits connected in a ring for circulating a pulse, a counter and selectors which turn data of a flip-flop to high when a counted value of the pulse from a terminal of the ring oscillator becomes a value corresponding to ten high order bits of control data, a pulse selector for taking out a clock of the flip-flop from the inversion circuit at the position specified by four bit control data and a delay line and logical product circuit which turn an output signal of the system to a high level for a predetermined time when the output of the flip-flop turns high, a register and adder accumulate the four low order bits of the control data every time the output signal turns high to update the data four bit data. As a result, the ring oscillator may be continuously operated and an oscillation cycle proportional to the control data may be set.
REFERENCES:
patent: 5045811 (1991-09-01), Lewis
patent: 5331294 (1994-07-01), Watanabe et al.
patent: 5394114 (1995-02-01), Davis
patent: 5416444 (1995-05-01), Yamauchi et al.
patent: 5465076 (1995-11-01), Yamauchi et al.
Patent Abstract of Japan, vol. 17, No. 456(E-1418) Aug. 1993, re JP-A 05102801.
Watanabe Takamoto
Yamauchi Shigenori
Mis David
Nippondenso Co. Ltd.
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