Analog/digital converter

Details Analog/digital converter Analog/digital converter

1985-05-14

1986-05-20

Shoop, Jr., William M.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, H03M 100

Patent

active

045904596

ABSTRACT:
A digital integrator (1) having a 16-bit output is followed by a first 12-bit digital/analog converter (2a) which is supplied with the output bits 1-11 and 16 of the integrator (1) and which forms a first tracking loop with a first subtracter (3a), which forms a first difference signal from the output signal, proportional to the input signal of the analog/digital converter, of a first amplifier (4a) and the output signal of the first digital/analog converter (2a), and a tracking circuit (6) which generates tracking signals for the integrator (1) on the basis of the difference signal. To extend the dynamic range, a second 12-bit digital/analog converter (2b) 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 (3b) and a second amplifier (4b), the gain factor of which is 1/16th of the gain factor of the first amplifier (4a), to which loop a control logic (15) switches over when the range which can be covered with the first digital/analog converter (2a) is exceeded. Switching 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.

REFERENCES:
patent: 3786491 (1974-01-01), Carleton
patent: 4193066 (1980-03-01), Morrison et al.
patent: 4296412 (1981-10-01), Mastner
patent: 4517550 (1985-05-01), Nakamura et al.

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