Continuous time sigma-delta analog-to-digital converter with...

Details Continuous time sigma-delta analog-to-digital converter with... Continuous time sigma-delta analog-to-digital converter with...

2008-07-09

2009-12-01

Mai, Lam T (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000

Reexamination Certificate

active

07626527

ABSTRACT:
A continuous time sigma-delta analog-to-digital converter (CT ΣΔADC) including an integrator, which includes an operational amplifier having at least one input terminal that receives an input signal, a feedback mechanism operatively connected to the operational amplifier, at least one capacitor coupled to the operational amplifier and the feedback mechanism, a reset switch coupled to the at least one capacitor, the operational amplifier, and the feedback mechanism, and a single directional voltage-to-current converter coupled to the input terminal. The single directional voltage-to-current converter translates a differential signal voltage only to a differential signal current. The reset switch resets the feedback mechanism. The single directional voltage-to-current converter behaves a one-directional resistor. The integrator prevents current generation when there is a non-linear disturbance at the input terminal of the operational amplifier. The single directional voltage-to-current converter clips an input current that exceeds a threshold value.

REFERENCES:
patent: 5977895 (1999-11-01), Murota et al.
patent: 6686864 (2004-02-01), Moreland
patent: 6697002 (2004-02-01), Sekiya et al.
patent: 2006/0092061 (2006-05-01), Jensen

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