Circuit arrangement for converting a resistance variation into a

Details Circuit arrangement for converting a resistance variation into a Circuit arrangement for converting a resistance variation into a

1980-12-29

1988-12-27

Grimm, Siegfried H.

Oscillators

With device responsive to external physical condition

331135, 331138, G01R 2702, H03B 520

Patent

active

047943505

ABSTRACT:
A simple circuit for converting the resistance variations of a strain gauge measuring bridge into a frequency variation of an oscillator. The circuit includes first and second phase shift circuits connected in cascade in a feedback loop with a frequency-independent device having a variable gain factor F connected in parallel with the first phase shift circuit. The first phase shift circuit includes a high pass filter and a summing amplifier and the second phase shift circuit includes an all-pass filter circuit.

REFERENCES:
patent: 2782311 (1957-02-01), Colander et al.
patent: 3127577 (1960-06-01), Lapointe
patent: 3845385 (1974-10-01), Ebrecht
patent: 3933046 (1976-01-01), Ebrecht
patent: 4006430 (1977-02-01), Ebrecht
Wait, "Introduction to Operational Amplifier Theory and Applications", pp. 68-69 and 47-48, 1975.
Millman, "Microelectronics" p. 580, 1979.
Philips Research Report Supplements, 1974 No. 6 pp. 56-57.

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