High and low frequency band dual output transducer

Details High and low frequency band dual output transducer High and low frequency band dual output transducer

2006-05-02

2006-05-02

Chapman, John E. (Department: 2856)

Measuring and testing

Vibration

Sensing apparatus

C073S659000, C073S862590

Reexamination Certificate

active

07036378

ABSTRACT:
A sensor circuit, method, and system for conversion of a high-impedance, broad frequency range signal from a transducer into two low-impedance signals, one containing high-frequency components and another containing low-frequency components of the input signal. The transducer can be a piezoelectric (PE) transducer transforming motion or vibration into a high-impedance electrical signal with a broad frequency range. A low-frequency circuit output can contain the frequencies in the linear region of the transducer's frequency band. The high-frequency output can contain the natural resonance frequency of the transducer. The circuit includes a low-frequency filter amplifier module and a high-frequency filter amplifier module, both amplifier modules having negative feedback, high input impedance, and low output impedance; the outputs may include a DC bias. The circuit may also include a source follower isolating the filter amplifier modules from each other. Optionally, the source follower is electrically disposed between the transducer and the high frequency filter amplifier module and employs an operational amplifier. The voltage supply for the source follower can be provided by the output of the low-frequency filter amplifier. The circuit may include a variety of means aimed at eliminating noise and temperature sensitivity.

REFERENCES:
patent: 5220836 (1993-06-01), Harms et al.
patent: 5714687 (1998-02-01), Dunegan
patent: 6092412 (2000-07-01), Flechsig et al.
patent: 6205872 (2001-03-01), Pflueg
Adel S. Sedra and Kenneth C. Smith, Microelectric Circuits, 787-793 (2ndEdition, 1987).
“Industrial Accelerometer”, (Endevco Model 5220) pp 1-6 (Mar. 29, 2000).

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