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US 9,882,574 B2Granted
DA converter, AD converter, and semiconductor device
AssigneeSony Corporation
InventorsGo Asayama, Noriyuki Fukushima, Yoshikazu Nitta, Yoshinori Muramatsu, Kiyotaka Amano
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Abstract
A DA converter includes a first DA conversion section for obtaining an analog output signal in accordance with a digital input signal value, and a second DA conversion section for obtaining an analog gain control output signal in accordance with a digital gain control input signal value. In the DA converter, the gain control of the analog output signal generated by the first DA conversion section is performed on the basis of the gain control output signal generated by the second DA conversion section.
Claims6
A DA converter comprising:
- first DA conversion circuitry configured to generate an analog output signal in accordance with a digital input signal value;
- and
- second DA conversion circuitry configured to generate an analog gain control output signal in accordance with a digital gain control input signal value,
- wherein gain control of the analog output signal generated by the first DA conversion circuitry is performed on the basis of the gain control output signal generated by the second DA conversion circuitry,
- the first DA conversion circuitry includes a plurality of current source cells configured to output a predetermined weighting constant current in accordance with information supplied to a control input terminal, and generate, as the analog output signal, an output current in accordance with the digital input signal value by additionally outputting a constant current output from a selected current source cell,
- the second DA conversion circuitry includes a plurality of current source cells configured to output a predetermined weighting constant current, and generate an output current in accordance with the digital gain control input signal value by additionally outputting the constant current output from the selected current source cell, and
- the gain control output signal generated by the second DA conversion circuitry is supplied to the control input terminal.
4 more elements
An AD converter comprising:
- reference-signal generation circuitry configured to generate a reference signal for converting an analog signal into a digital signal;
- comparison circuitry configured to compare the analog signal and the reference signal generated by the reference-signal generation circuitry;
- and
- counter configured to perform count processing with a predetermined count clock concurrently with comparison processing by the comparison circuitry and holding a count value at the point in time of completion of the comparison processing by the comparison section, wherein the reference-signal generation circuitry includes first DA conversion circuitry for generating the reference signal in accordance with a value of a digital input signal and second DA conversion circuitry for generating an analog gain control output signal in accordance with a value of a digital gain control input signal, and a gain of the reference signal generated by the first DA conversion circuitry is adjusted on the basis of the gain control output signal generated by the second DA conversion circuitry,
- the first DA conversion circuitry includes a plurality of current source cells configured to output a predetermined weighting constant current in accordance with information supplied to a control input terminal, and generate, as the reference signal, an output current in accordance with the digital input signal value by additionally outputting a constant current output from a selected current source cell,
- the second DA conversion circuitry includes a plurality of current source cells configured to output a predetermined weighting constant current, and generate an output current in accordance with the digital gain control input signal value by additionally outputting the constant current output from the selected current source cell, and
- the gain control output signal generated by the second DA conversion circuitry is supplied to the control input terminal.
4 more elements
A semiconductor device for detecting a physical-quantity distribution, the semiconductor device comprising:
- an effective area including electric-charge generation section for generating electric charge corresponding to incident electromagnetic wave and unit-signal generation circuitry for generating an analog unit signal corresponding to the electric charge generated by the electric-charge generation section in a unit component;
- reference-signal generation circuitry configured to generate a reference signal for converting the unit signal into a digital signal as a functional element for converting the unit signal into a digital signal;
- comparison circuitry configured to compares the unit signal and the reference signal generated by the reference-signal generation section;
- and
- a counter configured to perform count processing with a predetermined count clock concurrently with comparison processing by the comparison circuitry and holding a count value at the point in time of completion of the comparison processing by the comparison circuitry, wherein the reference-signal generation circuitry includes first DA conversion circuitry for generating the reference signal in accordance with a value of a digital input signal and second DA conversion circuitry for generating an analog gain control output signal in accordance with a value of a digital gain control input signal, and a gain of the reference signal generated by the first DA conversion circuitry is adjusted on the basis of the gain control output signal generated by the second DA conversion section,
- the first DA conversion circuitry includes a plurality of current source cells configured to output a predetermined weighting constant current in accordance with information supplied to a control input terminal, and generate, as the reference signal, an output current in accordance with the digital input signal value by additionally outputting a constant current output from a selected current source cell,
- the second DA conversion circuitry includes a plurality of current source cells configured to output a predetermined weighting constant current, and generate an output current in accordance with the digital gain control input signal value by additionally outputting the constant current output from the selected current source cell, and
- the gain control output signal generated by the second DA conversion circuitry is supplied to the control input terminal.
5 more elements
Dependencies are inferred from the claim text.