Low power current input delta-sigma ADC using injection FET...

Details Low power current input delta-sigma ADC using injection FET... Low power current input delta-sigma ADC using injection FET...

2005-12-20

2005-12-20

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

Reexamination Certificate

active

06977601

ABSTRACT:
A low power delta-sigma analog to digital converter10for converting current mode signals without an amplifier includes an integration capacitor26,a comparator30,and a first switch24in parallel with one another and coupled to an integration node28.A FET20and the first switch are disposed in series between a dump capacitor25and the integration node. A second switch27operates to discharge the dump capacitor, and an output of the comparator controls both switches in opposition. Preferably, no op-amps are included in the circuit, and current is supplied by an imaging component5.In a first comparator state, the first capacitor charges, the first switch is open and the second switch is closed, and the dump capacitor discharges. In a comparator second state, the first switch is closed and the second switch is open, and the integration capacitor transfers a fixed amount of charge into the dump capacitor through an injection FET operating in saturation.

REFERENCES:
patent: 4338530 (1982-07-01), Six et al.
patent: 5303027 (1994-04-01), Kuderer et al.
patent: 5550498 (1996-08-01), Kwan et al.
patent: 6018200 (2000-01-01), Anderson et al.
patent: 6201426 (2001-03-01), Sumiyoshi et al.

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