H - Electricity – 03 – K
Patent
H - Electricity
03
K
354/81
H03K 13/02 (1980.01)
Patent
CA 1151303
Abstract of the Disclosure A system for linearization of the digital output of a dual slope analog-to-digital converter. An analog signal representing the measured output of a condition responsive transducer is supplied to the dual slope integrating analog-to-digital converter also receiving a regulated constant reference signal. Using the integrator in a non-inverting mode, the A/D converter operates in a single conversion cycle by first positively integrating a value of the received analog signal below a maximum negative input voltage for a fixed time period and then negatively integrating a voltage signal corresponding to the differential between the reference voltage signal and the maximum voltage signal for a variable time period to a comparative threshold. During integration, digital counts proportional to the variable integration period are accumulated and emitted for operating a digital device such as a digital display. Digital linearization of the converter output is provided by use of a programmed microcomputer reading a programmable-read-only-memory (PROM) to run a variable frequency clock. The clock is regulated to effect a first phase converter time corresponding with an even multiple of the power line frequency.
409808
Dresser Industries Inc.
Macrae & Co.
LandOfFree
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