Oscillators – With device responsive to external physical condition
Patent
1976-07-19
1977-07-26
Grimm, Siegfried H.
Oscillators
With device responsive to external physical condition
324 41, 324DIG1, 331110, 331138, 331175, 331183, 340258C, 340285, G01D 2104, G01R 3300, G01V 310
Patent
active
040386090
ABSTRACT:
A replica bridge sensing circuit, comprising an amplifier having inverting and non-inverting inputs, which are symmetrically connected to a generator through a bridge circuit that has replica elements in corresponding branches. Replica elements are defined as circuit components which because of identity of the manufacturing process, are nearly identical both physically and electrically. A nearly balanced replica bridge, so connected, between the input and the output of such an amplifier forms a Replica Bridge Oscillator (RBO) circuit. Non-linear elements are included in the oscillator circuit to stabilize the amplifier output amplitude and the phase angles between the inputs and output. Replica Bridge Oscillator operation is substantially immune to changes in environmental conditions and to changes in the power supply voltages. With replica sensor elements used in corresponding branches, the Replica Bridge Oscillator is a sensing circuit particularly well adapted for use in detection of small sensor impedance variations. When utilized for metal detection, such a sensing circuit exhibits improved sensitivity and stability over existing detection circuits and is particularly adapted for multiaxial operation.
REFERENCES:
patent: 2711510 (1955-06-01), Tricebock
patent: 3151487 (1964-10-01), Schuck
LandOfFree
Replica bridge sensing circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Replica bridge sensing circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Replica bridge sensing circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-729182