H - Electricity – 03 – M
Patent
H - Electricity
03
M
H03M 1/34 (2006.01) H03M 1/10 (2006.01) H03M 1/12 (2006.01)
Patent
CA 2265192
A signal-processor, applicable especially to an analogue-to-digital conversion system, employs an inexpensive device (ADC 40) having a high temperature coefficient and enhances its temperature performance by, in an initial calibration phase, measuring the output of the device for a temperature-stable reference-signal (2V5) applied to its input and, in a subsequent measurement and compensation phase and at substantially the same ambient temperature, measuring the output for the same reference signal applied to the input and measuring the output for an input signal (Va) applied to the input. The digital input-signal reading is then corrected in dependence on a comparison of the two reference-signal readings which appeared at the output of the device. When used in a voltage- and current-measuring ADC arrangement, a stereo differential-input ADC unit (40) is advantageously employed together with voltage and current transformers (44, 45) having centre-tapped secondaries, the centre taps being fed from a signal related to the temperature-stable reference signal (2V5).
Alstom Uk Ltd.
Fetherstonhaugh & Co.
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