Floating-point A/D and D/A converter

Details Floating-point A/D and D/A converter Floating-point A/D and D/A converter

1981-03-16

1983-07-12

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347M, 367 67, H03K 1302

Patent

active

043933696

ABSTRACT:
This improves the digitizing of analog signals over a wide dynamic range for a floating point decimal conversion. The widely fluctuating input analog voltages are converted to currents to prevent saturation of circuit elements and are, first, compared with a derived reference signal to produce positive voltages or negative voltages if the input signal exceeds or is less than the derived reference current. The positive and negative voltages are fed to a combined floating point processing unit and microprocessor which generates two groups of digital signals. The first group is representative of m mantissa increments and the second group of n signals is indicative of the order of magnitude of the mantissa components. A mantissa digital-to-analog current generator and an order of magnitude digital-to-analog current generator are coupled in series with respect to each other to provide the derived reference current which is to be compared with the next sample of the input analog signal. Since the derived reference current is derived in the immediately preceding sample period, the newly sampled analog signal is compared as being greater or lesser with a still newer input sample. The first group of digital signals indicative of the mantissa increments and the second group of digital signals indicative of the order of magnitude are fed onto following circuitry to allow for example, a visual readout or further processing. The floating point analog-to-digital conversion has the great advantage over linear, analog arithmetic conversion by being able to handle large dynamic ranges of analog input signals.

REFERENCES:
patent: 3673398 (1972-06-01), Loffbourrow
patent: 4240070 (1980-12-01), Helbig et al.
Timko et al., 12-Bit Successive Approximation A/D, Electronic Design 20, . 27, 1978, pp. 68-76.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. III-5 to III-9.

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