Abstract: A circuit has an input and a two-wire output. The circuit is designed for use with HTPE transducers and comprised of four stages. The first stage is a charge amplifier based on operational amplifier, the second stage is a 1-pole passive low-pass filter, the third stage is an active 2-pole low-pass filter based on two JFETs, and the fourth stage is an emitter follower comprising two bipolar junction transistors connected to each other in Darlington configuration.

Abstract: A circuit has an input and a two-wire output. The circuit is designed for use with HTPE transducers and comprised of four stages. The first stage is a charge amplifier based on operational amplifier, the second stage is a 1-pole passive low-pass filter, the third stage is an active 2-pole low-pass filter based on two JFETs, and the fourth stage is an emitter follower comprising two bipolar junction transistors connected to each other in Darlington configuration.

Abstract: A circuit includes at least one input node, at least one output node, a signal conditioning circuit, and an electrostatic discharge (ESD) circuit. The signal conditioning circuit is characterized by a transfer function and adapted to receive input signals from and provide conditioned output signals to the input and output node(s), respectively. The signal conditioning circuit processes the input signal and outputs the conditioned output signal as a function of the transfer function. The ESD protection circuit is adapted to the signal conditioning circuit (i) to suppress electrostatic discharge signals applied to at least one of the input or output node(s) to levels electrically non-destructive to the signal conditioning circuit and (ii) to interact with the signal conditioning circuit in a manner substantially maintaining the transfer function.

Abstract: A circuit includes at least one input node, at least one output node, a signal conditioning circuit, and an electrostatic discharge (ESD) circuit. The signal conditioning circuit is characterized by a transfer function and adapted to receive input signals from and provide conditioned output signals to the input and output node(s), respectively. The signal conditioning circuit processes the input signal and outputs the conditioned output signal as a function of the transfer function. The ESD protection circuit is adapted to the signal conditioning circuit (i) to suppress electrostatic discharge signals applied to at least one of the input or output node(s) to levels electrically non-destructive to the signal conditioning circuit and (ii) to interact with the signal conditioning circuit in a manner substantially maintaining the transfer function.

Abstract: A transducer circuit, method, and system for conversion of a high-impedance, broad frequency range signal from a sensor into two low-impedance signals, one containing high-frequency components and another containing low-frequency components of the input signal. The sensor can be a piezoelectric (PE) sensor 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 sensor's frequency band. The high-frequency output can contain the natural resonance frequency of the sensor. 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.