Signal generating apparatus and test apparatus

Details Signal generating apparatus and test apparatus Signal generating apparatus and test apparatus

2009-12-08

2011-12-20

Lauture, Joseph (Department: 2819)

Coded data generation or conversion

Converter calibration or testing

C341S161000

Reexamination Certificate

active

08081096

ABSTRACT:
Provided is a signal generating apparatus comprising a DA converter that outputs an output signal corresponding to input data supplied thereto; a sample/hold unit that is provided between the DA converter and an output end of the signal generating apparatus, and that samples an output voltage of the DA converter and holds the sampled output voltage; a comparing section that compares (i) a level of a signal output from an analog circuit that propagates the output signal to output a signal corresponding to the input data to (ii) a level of the signal output by the DA converter; and a control section that, during a holding period, (iii) provides the DA converter with comparison data instead of the input data to cause the DA converter to output a comparison voltage corresponding to the comparison data, (iv) causes the comparing section to compare a voltage of the signal output by the analog circuit to the comparison voltage, and (v) adjusts the output voltage of the DA converter according to the input data based on a comparison result of the comparing section.

REFERENCES:
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patent: 5659312 (1997-08-01), Sunter et al.
patent: 6476742 (2002-11-01), Yamaguchi
patent: 6549150 (2003-04-01), Bulaga et al.
patent: 3382818 (1999-01-01), None

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