Analog/digital converter

Details Analog/digital converter Analog/digital converter

H - Electricity

03

M

354/70

H03M 1/46 (2006.01) H03M 1/00 (2006.01)

Patent

CA 1241753

Analog/Digital Converter Abstract of the Invention A digital integrator having a 16-bit output is followed by a first 12-bit digital/analog converter which is supplied with the output bits 1-11 and 16 of the integrator and which forms a first tracking loop with a first subtractor which forms a first dif- ference signal from the output signal, proportional to the input signal of the analog/digital converter, of a first amplifier and the output signal of the first digital/analog converter. A tracking circuit generates tracking signals for the integrator on the basis of the difference signal. To extend the dynamic range, a second 12-bit digital/analog converter is present which is supplied with bits 5-16 from the output of the integrator and which forms a second tracking loop with a second subtractor and a second amplifier, the gain factor of which is 1/16th of the gain factor of the first amplifier, to which loop a control logic switches over when the range which can be covered with the first digital/analog converter is exceeded. Switch- ing back takes place at the next zero crossing, that is to say, change of the most significant bit. The digital/analog converter is particularly suitable for processing the output signal of a current or voltage converter.

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