Programmable gain for delta sigma analog-to-digital converter

Details Programmable gain for delta sigma analog-to-digital converter Programmable gain for delta sigma analog-to-digital converter

1996-03-06

2000-03-14

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341139, H03M 300

Patent

active

060378875

ABSTRACT:
A programmable gain delta sigma analog-to-digital converter includes an analog input terminal receiving an analog input voltage, a charge summing conductor, an input capacitive switching circuit, and a feedback reference capacitive switching circuit coupled to the charge summing conductor. An integrator is coupled between the charge summing conductor and a comparator which supplies a stream of digital pulses to a digital filter that produces a digital number representing the analog input voltage. The feedback reference capacitive switching circuit includes a plurality of reference sampling capacitors, selectively coupling charge between a feedback reference voltage source and an integrating capacitor of the integration in response to a programmable gain control circuit so as to provide a selected gain for the analog-to-digital converter. The sampling rate of the capacitive switching circuits is adjusted proportionally to the selected gain to improve the dynamic range of the analog-to-digital converter.

REFERENCES:
patent: 4588981 (1986-05-01), Senn
patent: 4851841 (1989-07-01), Sooch
patent: 4876544 (1989-10-01), Kuraishi
patent: 4896156 (1990-01-01), Garverick
patent: 5134401 (1992-07-01), McCartney et al.
patent: 5305004 (1994-04-01), Fattaruso
patent: 5345236 (1994-09-01), Sramek, Jr.
patent: 5363102 (1994-11-01), Ferguson, Jr.

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