Digital-to-analog converter using a CCD having charge source reg

Details Digital-to-analog converter using a CCD having charge source reg Digital-to-analog converter using a CCD having charge source reg

1995-06-06

1998-09-01

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

H03M 166

Patent

active

058016562

ABSTRACT:
A D/A converter using a CCD for converting digital data to analog data, the CCD comprises a semiconductor having a first-conductivity type well. High-concentration charge source regions are positioned on predetermined portions of the semiconductor substrate in correspondence to the number of bits of the digital data. A plurality of barrier gates are formed on the charge source regions to respectively receive the bit signals of the digital data. Poly-gates are formed on the charge source regions having area that differ in correspondence to the bit signals of the digital data. A common output gate is formed on each of the poly-gates, and a high-concentration, second-conductivity type, floating diffusion area is formed on the output gate to collect charges accumulated in the poly-gates and to sense an overall amount of the charges. A reset gate and reset drain area are formed on the floating diffusion area for discharging the accumulated charges after the floating diffusion area senses the overall amount of the accumulated charges that corresponds to the analog data.

REFERENCES:
patent: 4087812 (1978-05-01), Terman
patent: 4099175 (1978-07-01), Rubin
patent: 4115766 (1978-09-01), Smith
patent: 4126852 (1978-11-01), Baertsch
patent: 4321584 (1982-03-01), McNutt

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