First-order sigma-delta analog-to-digital converter
First Claim
1. A first-order sigma-delta analog-to-digital converter, comprising:
- an input terminal configured to receive a unipolar input signal to be digitized;
an integrator circuit coupled to the input terminal;
a comparator coupled to an output of the integrator circuit;
control circuitry coupled to the integrator circuit and the comparator, the control circuitry configured to equalize time that an output signal generated by the integrator circuit is greater than zero volts and time that the output signal generated by the integrator circuit is less than zero volts during digitization of the unipolar input signal.
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Accused Products
Abstract
A first-order sigma-delta analog-to-digital converter includes an input terminal, an integrator circuit, a comparator, and control circuitry. The input terminal is configured to receive a unipolar input signal to be digitized. The integrator circuit is coupled to the input terminal. The comparator is coupled to an output of the integrator circuit. The control circuitry is coupled to the integrator circuit and the comparator. The control circuitry is configured to equalize time that an output signal generated by the integrator circuit is greater than zero and time that the output signal generated by the integrator circuit is less than zero during digitization of the unipolar input signal.
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Citations
20 Claims
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1. A first-order sigma-delta analog-to-digital converter, comprising:
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an input terminal configured to receive a unipolar input signal to be digitized; an integrator circuit coupled to the input terminal; a comparator coupled to an output of the integrator circuit; control circuitry coupled to the integrator circuit and the comparator, the control circuitry configured to equalize time that an output signal generated by the integrator circuit is greater than zero volts and time that the output signal generated by the integrator circuit is less than zero volts during digitization of the unipolar input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for operating a first-order sigma-delta analog-to-digital converter, comprising:
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receiving a unipolar signal for digitization; initiating digitization of the unipolar signal by setting an output signal generated by an integrator circuit of the first-order sigma-delta analog-to-digital converter to one-half of a reference voltage below zero volts; and during digitization of the unipolar signal, repeatedly subtracting the reference voltage from the output signal generated by the integrator circuit to equalize time that an output signal generated by the integrator circuit is greater than zero and time that the output signal generated by the integrator circuit is less than zero volts. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A first-order sigma-delta analog-to-digital converter, comprising:
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an input terminal to receive a unipolar input signal to be digitized; an integrator circuit coupled to the input terminal, the integrator circuit comprising; a differential amplifier; a first input capacitor comprising a first terminal coupled to a non-inverting input terminal of the differential amplifier; a second input capacitor comprising a first terminal coupled to an inverting input terminal of the differential amplifier; a first switch comprising; a first terminal coupled to a second terminal of the first input capacitor; and a second terminal coupled to a power supply voltage; a second switch comprising; a first terminal coupled to a second terminal of the second input capacitor; and a second terminal coupled to the power supply voltage; a comparator coupled to an output of the integrator circuit; and control circuitry coupled to the first switch, the second switch, and the comparator. - View Dependent Claims (17, 18, 19, 20)
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Specification