Method and apparatus for compensation for a DC voltage offset of

Details Method and apparatus for compensation for a DC voltage offset of Method and apparatus for compensation for a DC voltage offset of

1997-01-29

1998-03-24

Fleming, Fritz

Coded data generation or conversion

Converter compensation

341119, 341120, 341121, 341144, H03M 110

Patent

active

057317720

ABSTRACT:
Disclosed is a method and a device for compensating the DC offset (dU) of a D/A converter (2), particularly in the base frequency modulator of a mobile phone. The method and the device use an error correction register (5), whose value is changed on the basis of the DC offset, and which is added to each signal sample to be converted for compensating the DC offset. The value of the error correction register (5) is changed in a testing mode so that a preset control value is fed into the D/A converter (2), corresponding to the zero voltage of the output of an ideal D/A converter; the voltage values of outputs of a differential output pair (2a, 2b) arranged in connection with the D/A converter (2) are compared to verify the polarity of the voltage difference (dU) of the outputs and the polarity, i.e. the sign, of a relative DC offset; and, on the basis of the polarity of the voltage difference (dU), the value of the error correction register (5) is either decreased or increased by one from the preset initial value which is preferably zero.

REFERENCES:
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patent: 5061925 (1991-10-01), Sooch et al.
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English Translation of Official Action dated 8 Aug. 1994 on priority Finnish Application No. 935346 filed 30 Nov. 1993.
"Error Correction Techniques for High-Performance Differential A/D Converters" IEEE Journal of Solid-State Circuits, Dec. 1990, USA vol. 25, pp. 1318-1327.
IBM Technical Disclosure Bulletin vol. 16 No. 1, Jun. 1993.

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