Oscillators – Ring oscillators
Patent
1997-01-15
1999-03-30
Nelms, David C.
Oscillators
Ring oscillators
331 1A, H03B 2700, H03L 700
Patent
active
058894403
ABSTRACT:
The frequency of a clocking signal is adjusted in response to fluctuations in the power supply voltage. In one embodiment, a control circuit has a plurality of clock input terminals each coupled between selected adjacent ones of the stages of a multiple-stage ring oscillator circuit and has an output clock terminal coupled to an input terminal of the ring oscillator circuit. In this manner, the control circuit may implement a plurality of loops each including a different variety of the stages of the ring oscillator circuit, wherein the clocking signal associated with each of the loops has a unique frequency. A plurality of trip voltages each being equal to a unique predetermined fraction of the power supply voltage are compared to a reference voltage. The control circuit selects, in response to the comparison of the trip voltages and the reference voltage, one of the loops mentioned above to provide its clocking signal to an output terminal of the oscillator. Thus, fluctuations in the power supply voltage are reflected in the trip voltages and result in a selection of a loop which has associated therewith a clocking signal having a frequency appropriate for the power supply voltage.
REFERENCES:
patent: 4298971 (1981-11-01), Morokawa et al.
patent: 5440277 (1995-08-01), Ewen et al.
patent: 5625544 (1997-04-01), Kowshik et al.
Nelms David C.
Phan Trong
Programmable Microelectronics Corp.
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