Bridge-to-frequency converter

Details Bridge-to-frequency converter Bridge-to-frequency converter

1986-09-12

1989-02-28

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307236, 307228, 328150, H03K 1302, H03L 700

Patent

active

048088463

ABSTRACT:
A signal-conditioning circuit provides an output signal (V.sub.O) at a frequency representative of an effect such as strain or temperature that acts on a resistance bridge (20) preferably arranged in a Wheatstone configuration. A pair of energizing voltages (V.sub.E1 and V.sub.E2) are supplied on corresponding lines (21 and 22) to energize the bridge. The signal-conditioning circuit contains an integrator (34 and C1), a comparator that compares the integrator output voltage (V.sub.I) with one of the energizing voltages (V.sub.E2), and switching circuitry (23 and 24) that suitably switches the polarity of the energizing voltages in response to the output voltage.

REFERENCES:
patent: 3419784 (1968-12-01), Winn
patent: 3800300 (1974-03-01), Van Oostehout
patent: 4031532 (1977-06-01), First
patent: 4115767 (1978-09-01), Brosh et al.
patent: 4296413 (1981-10-01), Milkovic
"A New Resistance-to-Frequency Converter for Temperature Measurements in Calorimeters", Friedl et al., IEEE Transactions on Instrumentation and Measurement, vol. IM24, No. 4, 12/75.
"Simple and Accurate Strain Gauge Signal to Frequency Converter", by Tadeusz Sider, 1983, The Institute of Physics.
"Monolithic Nullor-A Universal Active Network Element", J. Huijsing et al., Journal Solid State Circuits, vol. SC12, No. 1, Feb. 1977.

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