Coded data generation or conversion – Analog to or from digital conversion – Bipolar
Patent
1992-09-11
1994-02-22
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Bipolar
341155, H03M 112
Patent
active
052891917
ABSTRACT:
An integrated circuit incorporating an analog-to-digital (A/D) conversion subsystem having a current mode in which only negative analog currents are converted and a voltage mode in which only positive analog voltages are converted is adapted to produce bipolar digital current and voltage signals. An on-board microprocessor operates the A/D conversion subsystem to perform a conversion in the current mode. If the converted digital value is non-zero, this value is used as the negative digital value of analog input signal. If the result of the conversion in the current mode is zero, a second conversion is made in the voltage mode and used as digital value with a positive polarity. An input circuit having an output impedance substantially equal to the "full scale equivalent" input impedance of the IC defined as the full scale voltage of the IC divided by the full scale current, eliminates the need for special scale factors to correlate the positive and negative conversion values.
REFERENCES:
patent: 3982240 (1976-09-01), Waehner
patent: 4310830 (1982-01-01), Babini et al.
patent: 4410880 (1983-10-01), Zaborowski
patent: 4975700 (1990-12-01), Tan et al.
patent: 4978959 (1990-12-01), Chong et al.
Hoff Marc S.
Moran M. J.
Westinghouse Electric Corp.
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