Transconductance circuit for piezoelectric transducer
AssigneeSuren Systems, Ltd.
InventorEric Scott Micko
Life of this patent
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Abstract
A transconductance monitoring and amplifying circuit for a piezoelectric transducer that may be used in, e.g., a motion detector system includes a FET, with the transducer (and, hence, the signal voltage reference) floating between the gate and source of the FET, as opposed to being connected to the common ground of the circuit. This permits the development of a larger detector signal and concomitantly the use of a relatively inexpensive FET instead of a relatively more expensive high impedance operational amplifier as must be used in conventional transconductance circuits. The FET and transducer can be held in a single four-pin package. A discrete time sampled operational amplifier may also be used.
Claims17
A piezoelectric detector, comprising:
- a piezoelectric transducer;
- and
- a transconductance circuit electrically connected to the transducer and including a field effect transistor (FET), the transconductance circuit including a transconductance resistor connected to the gate of the FET, the circuit including at least one discrete time sampled operational amplifier circuit.
A piezoelectric detector package, comprising:
- a housing;
- a piezoelectric transducer in the housing;
- and
- at least one discrete time sampled operational amplifier-based transconductance circuit operably engaged with the piezoelectric transducer.
A discrete time sampled operational amplifier (DTSOA)-based transconductance circuit, comprising:
- at least one input line;
- a piezoelectric transducer in the input line;
- an amplifier circuit receiving signals on the input line and generating an output;
- and
- at least one feedback element through which the output is sent back to the input line.
A transconductance circuit-driven discrete time sampled operational amplifier (DTSOA)-based differentiator circuit, comprising:
- at least one input line;
- an operational amplifier-based transconductance circuit in the input line;
- and
- a DTSOA-based differentiator (“delta-modulator”) circuit receiving signals on the input line and generating an output.
A transconductance circuit-driven discrete time sampled operational amplifier (DTSOA)-based differentiator circuit, comprising:
- at least one input line;
- a FET-based transconductance circuit in the input line;
- and
- a DTSOA-based differentiator (“delta-modulator”) circuit receiving signals on the input line and generating an output.
Dependencies are inferred from the claim text.