Sigma-delta modulator

Details Sigma-delta modulator Sigma-delta modulator

2007-10-31

2008-10-28

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S142000, C324S458000, C324S522000, C375S350000

Reexamination Certificate

active

07443325

ABSTRACT:
An integrator circuit (110) is provided including an amplifier element (170) configured to receive an input signal at an input node, amplify the input signal, and provide an amplified input signal at an output node; a feedback capacitor element (175) connected between the output node and the input node; and a current matching circuit (120) connected to the output node, and configured to sense an output voltage of the amplifier element and to provide a supplemental current (IM) to the input node that is less than or equal to a feedback current (IF) charging the feedback capacitor element. This supplemental current is substantially equal and opposite in polarity to a feedback current when the output voltage satisfies a set criterion.

REFERENCES:
patent: 5243345 (1993-09-01), Naus et al.
patent: 5646520 (1997-07-01), Frank et al.
patent: 5815537 (1998-09-01), Janssen
patent: 6140950 (2000-10-01), Oprescu
patent: 6624671 (2003-09-01), Fotouhi
patent: 7034542 (2006-04-01), Peterson
patent: 7230431 (2007-06-01), Mirme
patent: 2005/0184721 (2005-08-01), Peterson
Van Veldhoven, Robert H.M. “A Triple-Mode Continuous-Time ΣΔ Modulator With Switched-Capacitor Feedback DAC for a GSM-EDGE/CDMA2000/UMTS Receiver”IEEE Journal of Solid-State Circuits, vol. 38, No. 12, (Dec. 2003).

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