Floating-point digital-to-analog converting system

Details Floating-point digital-to-analog converting system Floating-point digital-to-analog converting system

1989-02-16

1990-08-21

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Nonlinear

341144, H03M 170

Patent

active

049510541

ABSTRACT:
A floating-point digital-to-analog converting system which includes a mantissa digital-to-analog converter (DAC) and an exponent DAC. Normally, the mantissa DAC has a digital-to-analog converting accuracy higher than that of the exponent DAC because of differences in their construction. Hence, as long as the accuracy of the mantissa DAC is greater than that of the exponent DAC, an analog mantissa output from the mantissa DAC is used as an analog output of the present system. On other other hand, once the accuracy of the mantissa DAC goes below that of the exponent DAC, data obtained by shifting digital input data is applied to the mantissa DAC. Then, the exponent DAC multiplies the analog mantissa by a weight corresponding to the digital exponent data included in the digital input data. Thus, an analog output is obtained from the exponent DAC.

REFERENCES:
patent: 4177457 (1979-12-01), Howlett
patent: 4240070 (1980-12-01), Helbig et al.
patent: 4250492 (1981-02-01), Yamakido et al.
patent: 4727355 (1988-02-01), Kohdaka et al.

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