Class 330/174 - With electromechanical transducer (e.g., piezoelectric crystal)

Subclass of Class 330 - Amplifiers
Definition: Subject matter wherein the coupling circuit between the
No. of patents: 25
Last issue date: 09/21/2010

Number	Title	Issue Date
7800443	Circuit arrangement for providing an analog signal, and electronic apparatus A circuit arrangement for providing an analog signal is disclosed. The circuit arrangement comprises a biasing resistor; an analog input arrangement; and a signal output, wherein the biasing resistor and the analog input arrangement are connected in series between a...	09/21/2010
7414466	Apparatus for reducing offset voltage drifts in a charge amplifier circuit An apparatus for reducing offset voltage drifts in a charge amplifier circuit is disclosed. The apparatus includes a charge amplifier circuit and a bias current compensation circuit. The bias current compensation circuit supplies bias current to lower any offset vol...	08/19/2008
7049729	Amplifier converting charge signal A positive charge of a sensor element is charged in a signal converting circuit, is converted into a positive voltage, and is outputted. When the polarity of the charge of the sensor element is inverted to the negative and an output of the signal converting circuit ...	05/23/2006
7042288	Charge amplifier for piezoelectric pressure sensor An object of the present invention is to provide a charge amplifier which can be operated at low cost so that electric charge generated in a piezoelectric pressure sensor having one end grounded is converted into a voltage signal. In the charge amplifier (...	05/09/2006
6972619	Amplifier with a gain proportional to power source voltage In order that an amplifier with a gain proportional to source voltage is obtained, the drain-source voltages of first and second P-channel MOS-FETs are zero-biased, and a voltage shifted higher by the amount of the threshold voltage of the P-channel MOS-FET on the b...	12/06/2005
6917245	Absolute power detector A method and apparatus is provided for detecting the output power of a power amplifier. The output power is detected by detecting the absolute values of the voltage and current at the output of the amplifier and mixing the detected voltage and current to generate a ...	07/12/2005
6781457	Drop amplifier housing with multiple tiers An amplifier housing assembly is disclosed. The housing assembly includes a first section including a first plurality of holes; and a second section including a second plurality of holes. The first and second sections are interconnected. The first and second section...	08/24/2004
6714070	Differential charge amplifier with built-in testing for rotation rate sensor Differential charge amplifier for processing charge signals from a rotation rate sensor, with a test signal being applied to the differential charge amplifier so that during normal operation the output of the amplifier corresponds to the test signal as well as to th...	03/30/2004
6624693	Amplification circuit for electric charge type sensor An amplification circuit for electric charge type sensor has a simple circuit configuration in which a common mode noise is adequately cancelled. In the acceleration sensor amplification circuit, the inversion input terminal of an operational amplifier is...	09/23/2003
6621341	Diagnostic medical ultrasound systems having a method and circuitry for front-end gain control A system and method of processing received signals in an ultrasound imaging system is disclosed. In the system, the received signals are amplified by means of a gain controlled amplifier, and the gain of the amplifier is varied, by varying the load capaci...	09/16/2003
6459245	Voltage supply for a sensor unit and acceleration sensor unit with such a voltage supply A voltage supply unit which operates at an internal switching frequency and has a capacitor connected in parallel with its output is connected to the input of a sensor unit operating at an internal switching frequency. The connecting line contains a resis...	10/01/2002
6392477	Amplification circuit for electric charge type sensor An amplification circuit for electric charge type sensor has a simple circuit configuration in which a common mode noise is adequately cancelled. In the acceleration sensor amplification circuit, the inversion input terminal of an operational amplifier is...	05/21/2002
6246287	Amplifier for piezoelectric acceleration sensor An amplifier having an operational amplifier, and in which an output terminal of an acceleration sensor is connected to the non-inverting input terminal of the operational amplifier, a leakage resistor R1 is connected between a non-inverting input termina...	06/12/2001
6218898	Circuitry for measuring piezoelectric signals A circuitry for measuring piezoelectric signals for a piezotransducer/charge amplifier combination with a range capacitor including a voltage divider with a switch element providing a feedback signal to the measuring input of a charge amplifier. The switc...	04/17/2001
6107881	Electronic interface circuit between a piezoelectric transducer and a circuit for processing a measuring signal provided by the transducer An electronic circuit serving as an interface between a piezoelectric transducer and a circuit for processing a measuring signal provided by said transducer, said electronic interface circuit serving for providing a constant direct current to said piezoel...	08/22/2000
6025762	Delay line incorporating a surface acoustic wave ladder filter and method of providing same A method (100) of providing a time delay to a signal utilizing a surface acoustic wave ladder filter includes a first step (102) of providing a piezoelectric substrate. A second step (104) includes disposing series and shunt coupled surface acoustic wave ...	02/15/2000
5446415	Intermediate frequency amplifier circuit In an intermediate frequency amplifier circuit having a crystal filter and a transistor amplifier, a tuning circuit including a coil and a capacitor is provided therebetween, and a current feedback resistor and a voltage feedback resistor are connected to...	08/29/1995
5130669	Apparatus for driving a mechanical resonator from a high impedance source The present invention concerns a high impedance signal source driving a relatively low input impedance mechanical resonating device such as a ceramic filter having an input impedance which varies with frequency. The high impedance source is further loaded...	07/14/1992
4492928	Comb filter Comb filter having a comb like band pass characteristic curve by using an ultrasonic delay line (9) is improved to reduce its size. An input signal is given through an impedance element 13 to a single terminal 10a of an improved delay line 9, wherein the ...	01/08/1985
4381487	Resonator coupled differential amplifier In differential amplifier circuits of the type having first and second transistors, the emitter of each transistor is connected to a different current source and the emitters are coupled by a ceramic filter tuned to 455 KHz. In one embodiment, wherein the...	04/26/1983
4268807	Band-pass filter and gain stage A band-pass filter and gain stage which produces a desired passband at a preselected center frequency. The present invention can be characterized as being a very passive frequency door whose output is lightly coupled to a broad band frequency amplifier ha...	05/19/1981
4247827	Surface acoustic wave filter arrangement A surface acoustic wave filter arrangement is provided in which both filter and associated driving amplifier are arranged in the same integrated circuit package....	01/27/1981
4227156	Circuit for at least two frequencies A circuit for at least two frequencies comprises a high frequency filter and a low frequency filter and a pair of series connected terminating resistors, the high frequency filter being connected to a first terminating resistor and directly to a common ci...	10/07/1980
4021761	Filter circuit having an acoustic surface-wave filter device A filter circuit includes an acoustic surface-wave filter device having an input transducer comprised of a set of interleaved electrodes disposed on a first portion of a body of piezo-electric material adapted to propagate acoustic surface waves for produ...	05/03/1977
4006437	Frequency filter A band-pass filter comprising a plurality of coupled electromechanical filters is disclosed. Each electromechanical filter has a frequency pass-band centered about a fundamental frequency and a plurality of higher frequency pass-bands which are centered a...	02/01/1977

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Class 330/174 - With electromechanical transducer (e.g., piezoelectric crystal)