Digital signal processor

Communications: directive radio wave systems and devices (e.g. – Testing or calibrating of radar system

Reexamination Certificate

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Details

C341S118000

Reexamination Certificate

active

07982663

ABSTRACT:
The digital signal processor is for correcting a DC output at an output terminal of an internal circuit of an analog circuit device. The digital signal processor includes a digital register for storing a digital value, a D/A converter for converting the digital value stored in the digital register into an analog voltage and applying the converted analog voltage to the output terminal as the DC output, a polarity determining circuit which outputs a first signal when an analog DC voltage at a reference correction point different from the output terminal in the internal circuit is higher than a predetermined threshold value and otherwise outputs a second signal, and an updating function configured to monotonously increase or decrease the digital value stored in the digital register while a predetermined one of the first and second signals is outputted from the polarity determining circuit.

REFERENCES:
patent: 5731772 (1998-03-01), Mikkola et al.
patent: 7545321 (2009-06-01), Kawasaki
Hans-Martin Rein et al, “A Symmetrical Analog Wide-band Multiplier IC Operating up to 8Gb/s”, IEEE, ISSCC, 1991, pp. 118-119.

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