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US 8,912,838 B1Granted
Passive offset and overshoot cancellation for sampled data circuits
AssigneeMaxim Integrated Products, Inc.
InventorHae-Seung Lee
Life of this patent
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Abstract
A zero-crossing detector with effective offset cancellation includes a set of series connected capacitors and an amplifier having an input terminal. An offset capacitor is operatively connected between the amplifier and the set of series connected capacitors. A switch is operatively connected to the input terminal, and an offset sampling capacitor is operatively connected to the switch. The switch connects the offset sampling capacitor to the input terminal of the amplifier during a charge transfer phase.
Claims18
A non-inverting integrator circuit comprising:
- a threshold detecting circuit configured to detect when an input voltage crosses a predetermined threshold level;
- a first sampled-data circuit coupled to the threshold detecting circuit, the first sampled-data circuit comprises a first sampling capacitor that samples the input voltage;
- a waveform generator coupled to the threshold detecting circuit, the waveform generator applies a predetermined waveform to the input of the threshold detecting circuit, the predetermined waveform causes an output voltage of the threshold detecting circuit to assume a predetermined voltage level;
- and
- a second sampled-data circuit coupled to the waveform generator, the second sampled-data circuit comprises a second sampling capacitor and a sampling switch, the sampling switch is configured to activate the second sampling capacitor in response to the output voltage of the threshold detecting circuit reaching the predetermined voltage level.
2 more elements
Dependencies are inferred from the claim text.