Multibit ΔΣ modulation DA converter

Details Multibit ΔΣ modulation DA converter Multibit ΔΣ modulation DA converter

2007-09-11

2007-09-11

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000

Reexamination Certificate

active

11379975

ABSTRACT:
A DA converter comprises a high-pass filter that outputs a multibit digital signal with a predetermined frequency or lower thereof attenuated if a signal level of the input multibit digital signal is less than a predetermined threshold, the high-pass filter outputting the multibit digital signal without attenuation if the signal level is at the threshold or higher; a ΔΣ modulator that performs ΔΣ modulation of the signal output from the filter unit; a dynamic element matching circuit that divides the signal output from the ΔΣ modulator to a plurality of signals; and a plurality of internal DA converters that convert the plurality of signals output from the dynamic element matching circuit to an analog signal.

REFERENCES:
patent: 5990819 (1999-11-01), Fujimori
patent: 6737999 (2004-05-01), Schreier
patent: 6741197 (2004-05-01), Melanson
patent: 6744392 (2004-06-01), Melanson
patent: 6803869 (2004-10-01), Melanson et al.
patent: 6967607 (2005-11-01), Melanson
patent: 2002-368620 (2002-12-01), None

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