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Piezoelectric transducer signal processing circuit

A technology of piezoelectric transducers and circuits, applied in circuits, charge amplifiers, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve problems such as expensive and high-impedance operational amplifiers

Inactive Publication Date: 2008-12-17
SUREN SYST
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] Here it is understood that conventional transconductance circuits for piezoelectric detectors to date have required relatively expensive high-impedance operational amplifiers due to the small charge generated by the piezoelectric detector having to be measured

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  • Piezoelectric transducer signal processing circuit
  • Piezoelectric transducer signal processing circuit
  • Piezoelectric transducer signal processing circuit

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Embodiment Construction

[0043] Some embodiments disclosed herein provide piezoelectric transducer signal processing circuitry. For example, one circuit described herein has an input line and a piezoelectric transducer in the input line, an amplifier that receives a signal on the input line and produces an output based on the transducer signal, and a circuit through which the output is sent back to the input line. at least one feedback element.

[0044] After reading this description, it will become apparent to a person skilled in the art how to implement the invention in various alternative embodiments and alternative applications. However, while various embodiments of the invention will be described herein, it is to be understood that these embodiments have been presented by way of example only, and not limitation. As such, this detailed description of various alternative embodiments should not be taken to limit the scope and breadth of the present invention as set forth in the appended claims.

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Abstract

A piezoelectric detector circuit has at least one input line, a piezoelectric transducer in the input line, an amplifier receiving signals on the input line and generating an output, and one or two feedback elements through which the output is sent back to the input line. The circuit may be a discrete time sampled operational amplifier (DTOA) based transconductance or ''voltage output mode'' circuit. In one embodiment, protection elements are associated with amplifier input lines to establish a reference voltage.

Description

technical field [0001] The present invention generally relates to piezoelectric transducer systems. Background technique [0002] Piezoelectric transducer systems have a wide variety of applications. As but not limited to one example, some security systems detect movement in the monitored space using passive infrared (PIR) motion sensors that detect motion due to movement between an object (such as a person) and its background environment. Changes in far-infrared radiation (8-14 micron wavelength) caused by temperature differences. Upon detection, the motion sensor typically sends a reading to the host system, which can then activate an intrusion "alarm," change interior lighting, open a door, or perform some other function. The advantage of this sensor is its simplicity and relative cheapness. [0003] Detectors of PIR sensors may include pyroelectric detectors that measure changes in far-infrared radiation. Such detectors work using the "piezoelectric effect," which ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/04
CPCG08B13/191H03F1/34H03F3/181H03F3/347H03F3/45475H03F3/70H03F2203/45528H10N30/802
Inventor 埃里克·斯科特·米科
Owner SUREN SYST
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