Electricity: power supply or regulation systems – Including an impedance – In a bridge
Patent
1996-03-15
1997-11-11
Wong, Peter S.
Electricity: power supply or regulation systems
Including an impedance
In a bridge
330146, H03H 200, H03F 326
Patent
active
056868260
ABSTRACT:
The present compensating circuit operates to reduce the span shift error due to ambient temperature changes of a span resistance compensated, bridge array circuit arrangement for a semiconductor transducer employing piezoresistive sensors. The span resistance method alone cannot reduce the span shift error to less than one percent (1%) for full scale. The present compensating circuit applies a constant voltage source, derived from the voltage source applied to the transducer, to a non-inverting input to an operational amplifier. The circuit also applies an ambient temperature dependent voltage, derived from the ambient temperature dependent bridge resistance of the bridge array circuit, to an inverting input of the operational amplifier. Both inputs to the operational amplifier are fed back through a different resistance loop to control the output voltage in response to the non-linearity of the ambient temperature dependent bridge resistance. The present circuit produces a compensation voltage which counteracts the downward span shift influence of the bridge resistance, resulting in a span shift error of less than five tenths of a percent (0.5%) for full scale.
REFERENCES:
patent: 3568044 (1971-03-01), Elazar
patent: 3651696 (1972-03-01), Rose
patent: 3831042 (1974-08-01), La Claire
patent: 4171509 (1979-10-01), Stephens et al.
patent: 4192005 (1980-03-01), Kurtz
patent: 4333349 (1982-06-01), Mallon et al.
patent: 4419620 (1983-12-01), Kurtz et al.
patent: 4476726 (1984-10-01), Kurtz et al.
patent: 4611163 (1986-09-01), Madeley
patent: 5053692 (1991-10-01), Craddock
patent: 5398194 (1995-03-01), Brosh et al.
Kurtz Anthony D.
Landmann Wolf S.
Kulite Semiconductor Products
Vu Bao Q.
Wong Peter S.
LandOfFree
Ambient temperature compensation for semiconductor transducer st does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ambient temperature compensation for semiconductor transducer st, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ambient temperature compensation for semiconductor transducer st will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1232019