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US 11,689,157 B2Granted
Low power relaxation oscillator circuit
AssigneeNXP B.V.
InventorsRicardo Pureza Coimbra, Luis Enrique Del Castillo
Life of this patent
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Abstract
A low power relaxation oscillator circuit includes, in one embodiment, a first comparator for comparing voltages at first and second inputs, respectively, a first capacitor coupled to the first input of the first comparator, and a first circuit configured for charging the first capacitor to a first voltage. The first voltage is related to a propagation delay of the first comparator.
Claims16
An apparatus comprising:
- an oscillator for generating an oscillating signal, the oscillator comprising:
- a first comparator for comparing voltages at first and second inputs, respectively;
- a first capacitor coupled to the first input of the first comparator;
- a first circuit configured for charging the first capacitor to a first voltage, wherein the first voltage is related to a propagation delay of the first comparator and varies with the propagation delay of the first comparator;
- a second capacitor;
- a third capacitor;
- a current source for charging the second capacitor or the third capacitor with a substantially constant current;
- a first switch for coupling the first capacitor in series with the second capacitor as the second capacitor is being charged by the current source;
- and
- a second switch for coupling the first capacitor in series with the third capacitor as the third capacitor is being charged by the current source.
7 more elements
An apparatus comprising:
- an oscillator for generating an oscillating signal, the oscillator comprising:
- a first comparator for comparing voltages at first and second inputs, respectively;
- a first capacitor coupled to the first input of the first comparator;
- a first circuit configured for charging the first capacitor to a first voltage, wherein the first voltage is related to a propagation delay of the first comparator and varies with the propagation delay of the first comparator;
- a first flip-flop comprising a clock input coupled to an output of the first comparator, a data input, and a data output, wherein the first voltage is further related to a propagation delay of the first flip-flop;
- and
- a multiplexer comprising a first input coupled to the data output of the first flip-flop, wherein the first voltage is further related to a first propagation delay between the first input and an output of the multiplexer.
4 more elements
An apparatus comprising:
- an oscillator for generating an oscillating signal, the oscillator comprising:
- a first comparator for comparing voltages at first and second inputs, respectively;
- a first capacitor coupled to the first input of the first comparator;
- a second capacitor;
- a third capacitor;
- a current source for charging the second capacitor or the third capacitor with a substantially constant current;
- a first switch for coupling the first capacitor in series with the second capacitor as the second capacitor is being charged by the current source;
- a second switch for coupling the first capacitor in series with the third capacitor as the third capacitor is being charged by the current source;
- and
- a first circuit for periodically charging the first capacitor.
7 more elements
An apparatus comprising:
- an oscillator for generating an oscillating signal, the oscillator comprising:
- a first capacitor;
- a current source that provides a substantially constant current;
- a first switch for selectively connecting the first capacitor with the current source;
- a second switch for selectively discharging the first capacitor;
- a control circuit for controlling the first and second switches based on the oscillating signal;
- a circuit for adjusting the oscillating signal based on changes in temperature of the oscillator;
- a first comparator for comparing voltages at first and second inputs, respectively;
- a second capacitor coupled to the first input of the first comparator;
- a third switch for selectively coupling the first capacitor in series with the second capacitor;
- and
- a first circuit for periodically charging the second capacitor.
9 more elements
Dependencies are inferred from the claim text.