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US 10,656,006 B2Granted
Sensing circuit comprising an amplifying circuit and an amplifying circuit
AssigneeSonion Nederland B.V.
InventorAdrianus Maria Lafort
Life of this patent
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Abstract
A sensing system with an AC feedback to the non-signal and non-biased terminal of the transducer. An impedance element, such as two anti-parallel diodes, are provided at the amplifier input, and the amplifier gain is negative and has a size sufficient to ensure that the input on the one terminal does not exceed the forward voltage of the diode.
Claims15
A sensing system comprising:
- a transducer having a first output terminal and a second output terminal,
- a first voltage supply configured to supply a first voltage to the first output terminal,
- an amplifier having an amplifier input and an amplifier output,
- a connection element connecting the first output terminal to the amplifier input, the connection element comprising an impedance element connected also to a predetermined voltage, the impedance element having:
- a first impedance, when a voltage over the impedance element is below a threshold voltage and
- a second impedance, lower than the first impedance, when a voltage over the impedance element exceeds the threshold voltage, the first impedance exceeding the second impedance and
- a filter circuit blocking DC but transferring AC, the circuit connected to the amplifier output configured to feed an AC signal to the second output terminal,
- where the amplifier amplifies the signal from the connection element into an amplified signal fed to the filter circuit, the amplifier having a negative amplification with an absolute value higher than or equal to the first voltage divided by the threshold voltage, the absolute value being at least 2.
5 more elements
Dependencies are inferred from the claim text.