Analog signal outputting circuit and multi-level delta-sigma...

Details Analog signal outputting circuit and multi-level delta-sigma... Analog signal outputting circuit and multi-level delta-sigma...

2005-08-09

2005-08-09

Nguyen, John B (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S143000, C341S144000

Reexamination Certificate

active

06927720

ABSTRACT:
An analog signal outputting circuit comprises two unit analog circuits for outputting an analog signal, corresponding to levels “−1” or “1”, and a low-pass filter for smoothing the analog signal output from the two unit analog circuits, as selected by codes output from the four-valued delta-sigma modulator. In case the input signal is −2 or +2, outputs of the unit analog circuits are summed together to output an analog signal corresponding to −2 or +2. In case the input signal is −1 or +1, outputs of the unit analog circuits are alternately used to output an analog signal corresponding to −1 or +1 to reduce the non-linearity error resulting from variations in the analog devices.

REFERENCES:
patent: 5257026 (1993-10-01), Thompson et al.
patent: 5274375 (1993-12-01), Thompson
patent: 6642873 (2003-11-01), Kuang
patent: 6-224772 (1994-08-01), None
patent: 6-276099 (1994-09-01), None
patent: 2001-94429 (2001-04-01), None

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