Digital-to-analog converter

Details Digital-to-analog converter Digital-to-analog converter

1986-04-15

1988-02-23

Shoop, Jr., William M.

Communications: electrical

Audible indication

Percussion-type sound producer

H03M 168

Patent

active

047273550

ABSTRACT:
A digital-to-analog converter (DAC) converts digital input data into an analog output signal with less harmonic distortion over an entire signal-level range. An exponent value detector detects from the digital input data the number of bits by which the digital input data is to be shifted to form a mantissa part thereof. A digital shifter shifts the digital input data in accordance with the output of the exponent value detector, and outputs the mantissa part which is then supplied to a mantissa-part DAC. The mantissa-part DAC comprises an R-2R resistor ladder network and outputs the result of DA conversion of the mantissa part to an exponent-part DAC. The exponent DAC shifts the output of the mantissa-part DAC by an amount determined by the output of the exponent value detector, and outputs the shifted signal as the analog output signal of this DAC. A control circuit is provided between the digital shifter and the mantissa-part DAC, which prevents, in accordance with the output of the exponent value detector, the least significant bits of the mantissa-part DAC from operatively functioning to thereby decrease the number of operable bits thereof when the magnitude of the digital input data is small.

REFERENCES:
patent: 3303489 (1967-02-01), Krucoff
patent: 3555540 (1966-08-01), Hartke
patent: 3670326 (1972-06-01), Sloane
patent: 3673398 (1972-06-01), Loffbourrow
patent: 3705359 (1972-12-01), Kappes
patent: 4177457 (1979-12-01), Howlett
patent: 4250492 (1981-02-01), Yamakido
patent: 4305063 (1981-12-01), Hanson
Hnatek, "A User's Handbook of D/A and A/D Converters", 6/1976, pp. 90-91.
Sheingold "Analog-To-Digital Conversion Notes", .COPYRGT.1980, p. 108.

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