Digital time domain readout circuit for bioFET sensor cascades
First Claim
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1. A sensor readout circuit comprising:
- a plurality of logic gates coupled in cascade, each logic gate comprising at least one bioFET sensor;
a delay extractor configured to generate a pulse-width signal based on a time difference between an output signal from the plurality of logic gates and a reference signal; and
a counting module configured to receive the pulse-width signal and output a digital count corresponding to a width of the pulse-width signal.
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Abstract
Various bioFET sensor readout circuits and their methods of operation are described. A readout circuit includes a plurality of logic gates coupled in cascade, a delay extractor, and a counting module. Each logic gate of the plurality of logic gates includes at least one bioFET sensor. The delay extractor is designed to generate a pulse-width signal based on a time difference between an output signal from the plurality of logic gates and a reference signal. The counting module is designed to receive the pulse-width signal and output a digital count corresponding to a width of the pulse-width signal.
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Citations
20 Claims
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1. A sensor readout circuit comprising:
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a plurality of logic gates coupled in cascade, each logic gate comprising at least one bioFET sensor; a delay extractor configured to generate a pulse-width signal based on a time difference between an output signal from the plurality of logic gates and a reference signal; and a counting module configured to receive the pulse-width signal and output a digital count corresponding to a width of the pulse-width signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A sensor readout circuit comprising:
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a plurality of inverters coupled in cascade, each inverter comprising at least one bioFET sensor, wherein an output of the plurality of inverters is fed back as an input to the plurality of inverters; and a counting module configured to receive the output of the plurality of inverters and to output a digital count corresponding to a frequency of the output of the plurality of inverters. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A sensor readout circuit comprising:
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a plurality of inverters coupled in cascade, each inverter comprising at least one bioFET sensor, wherein an output of the plurality of inverters is fed back as an input to the plurality of inverters; a mixer configured to receive the output of the plurality of inverters and an oscillating reference signal and to generate a down-converted signal corresponding to a difference in an oscillation frequency between the output of the plurality of inverters and the oscillating reference signal; and a counting module configured to receive the down-converted signal and to output a digital count corresponding to a frequency of the down-converted signal. - View Dependent Claims (17, 18, 19, 20)
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Specification