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US 2009/0289733 A1Published application
Method of forming an oscillator circuit and structure therefor
AssigneeSemiconductor Components Industries, LLC
InventorsFrantisek Sukup, Karel Ptacek
Life of this patent
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Abstract
In one embodiment, an oscillator circuit is configured to oscillate at a base frequency. The oscillator is configured to receive a synchronization signal and restart a period of the oscillator signal responsively to the synchronization signal.
Claims15
An oscillator circuit of a power supply controller comprising:
- a timing input configured to be coupled to a timing element;
- a synchronization input operably coupled to receive a synchronization signal that has a first state and a second state wherein the synchronization input receives the synchronization signal from external to the oscillator circuit;
- a first edge detector operably coupled to receive the synchronization signal and set an output of the first edge detector to a first state of the first edge detector responsively to the synchronization signal changing from the first state of the synchronization signal to the second state of the synchronization signal;
- an oscillator configured to use the timing element to oscillate at a first frequency having a period and to form a clock signal having a first state and a second state during the period, the oscillator configured to restart the clock signal at the first state responsively to the synchronization signal transitioning from the first state of the synchronization signal to the second state of the synchronization signal during an interval where the clock signal is in the second state of the clock signal, and the oscillator configured to not restart the period responsively to the synchronization signal transitioning from the first state of the synchronization signal to the second state of the synchronization signal during an interval where the clock signal is in the first state of the clock signal;
- and
- an output circuit operably coupled to receive the clock signal and force the synchronization input to the second state of the synchronization signal responsively to the clock signal transitioning from the second state of the clock signal to the first state of the clock signal.
3 more elements
A method of forming an oscillator circuit comprising:
- configuring the oscillator circuit to oscillate at a first frequency having a period and to form a clock signal having first and second states during the period wherein the oscillator circuit is configured to be coupled to a timing element on a timing input and form the first frequency responsively to the timing element;
- forming the oscillator circuit to receive a synchronization signal from external to the oscillator circuit wherein the synchronization signal has a first state and a second state wherein the synchronization signal is received on a synchronization input of the oscillator circuit;
- configuring the oscillator circuit to restart the clock signal at the first state and to form the period at the first frequency responsively to the synchronization signal transitioning from the first state of the synchronization signal to the second state of the synchronization signal during an interval where the clock signal is in the second state of the clock signal;
- and
- configuring the oscillator circuit to drive the synchronization input to the second state of the synchronization signal responsively to the clock signal transitioning from the second state of the period to the first state of the period.
2 more elements
Dependencies are inferred from the claim text.