Oscillators – With device responsive to external physical condition
Patent
1976-10-01
1977-10-11
Corcoran, Robert J.
Oscillators
With device responsive to external physical condition
324 34D, 328 5, 331117R, 340195, 340258C, 340282, 361180, G08C 2100
Patent
active
040538494
ABSTRACT:
A high frequency pickoff is disclosed having two spaced inductors electrically connected in series and a capacitor connected in parallel with the inductors, thereby forming a parallel resonant circuit. A conducting member is mounted for motion in the space between the two inductors. A pair of transistors are mounted in push/pull configuration to alternately connect first one end and then the other of the resonant circuit to a source of electrical energy. The source disclosed is a current source for matching the high impedance of the parallel resonant circuit. When the electrical energy is switched at substantially the resonant frequency of the parallel circuit, differential motion of the conducting member relative to the inductors provides differential amplitude output at the frequency of resonance of electrically opposed ends of the resonant circuit. A configuration for enhancing gain in the pickoff circuit includes tuning capacitors connected parallel with each of the inductors and providing similar resonant frequencies therewith slightly removed from the overall circuit resonant frequency. Pickoff circuit gain is enhanced by an increase in the differential output due to changes occurring in each inductance as well as changes occurring in the frequency of maximum impedance associated with each tuned inductive capacitive leg of the circuit.
REFERENCES:
patent: 3109145 (1963-10-01), Morris et al.
patent: 3474332 (1969-10-01), Brown
patent: 3963996 (1976-06-01), Skerlos
patent: 3967064 (1976-06-01), Signorth
Bower Gerald S.
Voelker Scott F.
Corcoran Robert J.
Systron Donner Corporation
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