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US 2007/0164792 A1Published application
Output hold circuits for sample-data circuits
AssigneeCambridge Analog Technologies, Inc.
InventorHae-Seung Lee
Life of this patent
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Abstract
A sampled-data analog circuit uses zero-crossing detector. A waveform generator produces a plurality of segments of ramp at the output. An output of a zero crossing detector controls a sampling switch, thereby causing a precise sample of the output voltage to be taken at the instant the zero crossing detector senses the zero crossing of the input signal. The waveform generator further includes a output hold function to maintain the output voltage.
Claims19
A switched-capacitor circuit, comprising:
- a level-crossing detector to generate a level-crossing detection signal when an input signal crosses a predetermined level;
- a waveform generator to generate a predetermined waveform;
- and
- an amplifier, operatively coupled to said level-crossing detector and said waveform generator;
- said amplifier holding an output thereof in response to said level-crossing detection signal.
2 more elements
A method for sampling a signal, the method comprising:
- (a) sampling an input voltage using the switched capacitance network;
- (b) determining when a node voltage of the switched capacitance network crosses a predetermined level;
- (c) generating a predetermined waveform at an output node;
- (d) transferring the sampled input voltage to the output node;
- and
- (e) holding the transferred sampled input voltage at a constant level at the output node when it is determined that the node voltage of the switched capacitance network crosses the predetermined level.
3 more elements
Dependencies are inferred from the claim text.