US3855466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for linearization of the characteristic of a sensor
Assignee: Bodenseewerk Geratetechnik GmbH
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Filing: 1974-01-23
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Granted: 1974-12-17
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Expires: 1994-01-23
Abstract
Abstract A photovoltaic cell observes a temperature and produces a current which is applied to one input of a precision comparator. The output signal from the comparator is applied to an integrator. There is a feedback loop from the output of the integrator to the other input of the comparator. In this loop the integrator output signal is converted to digital form and then applied to a read-only memory which has stored in it the characteristic of the cell. The output of the read-only memory is converted back to analog form and through a resistor is applied to the input of the comparator. Thus the signal at the output of the integrator, which is taken off through an output buffer amplifier, represents the temperature seen by the cell, with a high degree of accuracy.
Inventors
- 👤 K Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:27
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/10; G01J5/28; G01J5/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
In an electronic apparatus for linearization of the output signal of a sensor having a given characteristic, which appAratus comprises an amplifier channel having an input and an output and a non-linear feedback loop around said channel, the improvement wherein said feedback loop comprises: an analog-to-digital converter connected to said output to convert the signals from the channel output to digital form; a read-only memory having the characteristic of said sensor stored therein, said memory being connected to said converter to receive said signals in digital form and to produce digital output signals corrected for temperature; and a digital-to-analog converter connected to said memory to convert said corrected signals to analog form, said digital-toanalog converter being connected to said channel input to apply said corrected signals in analog form to said input.
Claim 2
Dependent Claim
132 words
In an electronic apparatus for linearization of the output signal of a sensor having a given characteristic, which appAratus comprises an amplifier channel having an input and an output and a non-linear feedback loop around said channel, the improvement wherein said feedback loop comprises: an analog-to-digital converter connected to said output to convert the signals from the channel output to digital form; a read-only memory having the characteristic of said sensor stored therein, said memory being connected to said converter to receive said signals in digital form and to produce digital output signals corrected for temperature; and a digital-to-analog converter connected to said memory to convert said corrected signals to analog form, said digital-toanalog converter being connected to said channel input to apply said corrected signals in analog form to said input.
Claim 3
Dependent Claim
64 words
In an apparatus as set forth in claim 1, wherein said amplifier channel comprises: a comparator having two inputs one of which is connected to said sensor and the other of which is connected to the digital-to-analog converter, said comparator having an output; and an integrator having an input connected to the comparator output, said integrator having an output forming the amplifier channel output.
Claim 4
Dependent Claim
16 words
In an apparatus as set forth in claim 1, wherein the sensor is a photovoltaic cell.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |