signal processing of piezoelectric transducer

[74] In any case, returning to Figure 13, the comparator 74 functions as an analog-to digital converter that outputs a digitized signal to processing logic 76. The two inputs of amplifier 310 are protected by two diode pairs consisting of diodes 320 and 322, and of diodes 330 and 332, respectively, with each pair connected between positive and negative supply voltages V+ and V-. All piezoelectric transducers work on the piezoelectric effect. If this node is connected to another node at the same voltage, then no current flows between the two nodes. The circuit of claim 1, wherein the first set of protection elements comprises a first pair of diodes connected in series between the protection voltage lines and having a mutual connection node connected to the first amplifier input, and the second set of protection elements comprises a second pair of diodes connected in series between the protection voltage lines and having a mutual connection node connected to the second amplifier input. 0809570, Country of ref document: Though the circuit 800, at first glance, does not resemble a delta- modulator, it yet can be seen, with the understanding that the buffered transducer output impedance is much lower than R9, that the comparator input still receives the sum of the transducer voltage and capacitor C8 voltage and that the comparator still controls the voltage on C8 by feedback via R9, thus preserving the delta-modulator function. 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. [78] Figure 14 shows a circuit 200 in which an operational amplifier-based transconductance circuit 202 drives the input of a discrete-time-sampled operational amplifier-based (DTSOA) differentiator circuit 204. When the ceramic of the piezoelectric transducer 22 experiences mechanical strain, electrical charge migrates from one plate to the other plate. activate an audible or visual alarm 21 or other output device such as an activation system for a door, etc. reference. BR. [86] As has been illustrated in Figures 12 and 13, a DTSOA can be included in the feedback control loop of a transconductance circuit. [94] The DC component of the digital output from circuit 600 is a quiescent duty cycle (whatever duty cycle is necessary to create the DC voltage to satisfy the DC feedback loop). The DTSOA is operated as a delta-modulator, with C8 as its input capacitor. [20] The details of the present invention, both as to its structure and operation, can best be understood in reference to the accompanying drawings, in which like reference numerals refer to like parts, and in which: [21] Figure 1 is a block diagram of a motion sensing system architecture using a piezoelectric transducer detector system; [22] Figure 2 is a schematic diagram of a first embodiment of a piezoelectric transducer transconductance circuit; [23] Figure 3 is a schematic diagram of a second embodiment of a piezoelectric transducer transconductance circuit; [24] Figure 4 is a schematic diagram of a third embodiment of a piezoelectric transducer transconductance circuit; Author links open overlay panel Liang Wang a b Viktor Hofmann b Fushi Bai b Jiamei Jin a Jens Twiefel b. The transconductance circuit's (AC) gain can be set by means of feedback voltage divider R8/R7, which provides a much smaller feedback rectangular wave than a DTSOA circuit's usual full-supply-voltage "high" and "low" wave (e.g. RU, Ref document number: Such transducers may be fitted with either an amplifier, or, more commonly, with an FET 510, as an output voltage buffer device. However, in circuit 500, the DTSOA circuit employs a low-cost, low-impedance comparator 504 with an FET 510 providing a high impedance summing node input for the piezoelectric transducer transconductance circuit. Moreover, it is not necessary for a device or method to address each and every problem sought to be solved by the present invention, for it to be encompassed by the present claims.

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