Miscellaneous active electrical nonlinear devices – circuits – and – External effect – Utilizing conversion of mechanical variations into...
Patent
1996-10-10
1999-01-12
Le, Dinh
Miscellaneous active electrical nonlinear devices, circuits, and
External effect
Utilizing conversion of mechanical variations into...
327509, 327344, 327100, 327 65, 327563, 330258, 310319, H03F 345, H01L 4108
Patent
active
058595619
ABSTRACT:
A differential load amplifier for receiving two measurement currents from a differential piezoelectric sensor and outputting a voltage proportional to a useful signal measured by the sensor. The differential load amplifier includes a subtraction device for determining a difference signal between the two measurement currents received from the sensor, and an integration device including and an integration capacitor for integrating the difference signal determined by the subtraction device. The subtraction device includes a negative immitance impedance converter, and the integration device includes an operational amplifier connected as an integrator. The subtraction and integration devices may also be implemented by a differential current amplifier and an integration capacitor, respectively.
REFERENCES:
patent: 3948098 (1976-04-01), Richardson et al.
patent: 4902970 (1990-02-01), Suquet
Louis DE PIAN, et al., "Active Filters: Part 4 Approaching the Ideal NIC", Electronics, vol. 41, No. 19, Sep. 16, 1968, New York, pp. 105-108.
Le Dinh
Societe Nationale D'Etude et de Construction de Moteurs D'aviati
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