Non-linear signal gain compression and sampling
US5226733A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1992 |
| Grant date | Jul 13, 1993 |
| Priority date | — |
| Expiry date | Jul 23, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K7/01
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.