MICHAEL C MITCHELL
Medical Practice at Biddle Ct, West Palm Beach, FL

5226733, Jul 13, 1993

Jul 23, 1992

7/917644

Michael D. Mitchell - Royal Palm Beach FL
David C. Smith - Jupiter FL

United Technologies Corporation - Hartford CT

G01K 714

374172

The voltage across a temperature responsive diode supplied with constant current is sensed and applied to two analog amplifiers with different gains. The output from each amplifier is applied to a sample and hold circuit. The output from each sample and hold circuit is applied to an analog to digital converter to produce two binary signals. The minimum binary value of one signal corresponds to the minimum voltage drop; the maximum to the drop at an intermediate temperature. The minimum binary value of a second signal corresponds to the drop at the intermediate temperature and the maximum binary value of this signal corresponds to the drop at a maximum temperature. Both binary signals are applied to the multiplexer which selects one signal to address a stored temperature in a look-up table. The multiplexer uses the binary signal produced with the high gain amplifier output for the address until the most significant bit in the signal switches states, when the multiplexer uses the binary signal produced from the low gain amplifier. The address is a stored temperature.