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US 7,254,203 B2Granted
Method and apparatus for use of high sampling frequency A/D converters for low frequency sampling
AssigneeCredence Systems Corporation
InventorsMaurizio Gavardoni, Paolo Dalla Ricca
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Abstract
A method and apparatus for adding fill-in clock pulses to an analog to digital converters input clock signal between requests for analog data acquisition. The circuit that provides the fill-in clock pulses is able to detect a request for analog data acquisition, synchronously stop adding fill-in clock pulses, and track the request for data acquisition.
Claims28
A method for providing signals to a sampler circuit, said method comprising:
- determining a maximum wait time;
- detecting an input clock pulse, wherein said input clock pulse is provided to said sampler circuit;
- measuring a wait time until the next input clock pulse is detected;
- generating a fill-in clock pulse;
- and
- providing said fill-in clock pulse to said sampler circuit if the measured wait time exceeds the determined maximum wait time.
3 more elements
An apparatus comprising:
- a first delay which receives a signal at an input terminal;
- a clock circuit;
- a logic gate;
- a pulse detection circuit coupled between an output terminal of the first delay and the clock circuit;
- a second delay coupled between an output terminal of the first delay and a first input terminal of the logic gate;
- and
- a clock divider circuit coupled between the pulse detection circuit and the clock circuit;
- wherein the clock divider circuit provides an output signal to a second input terminal of the logic gate.
5 more elements
Dependencies are inferred from the claim text.