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Class Information
Number: 330/174
Name: Amplifiers > Interstage coupling > With electromechanical transducer (e.g., piezoelectric crystal)
Description: Subject matter wherein the coupling circuit between the two cascaded amplifier devices includes means to convert the electric signal to mechanical vibrations and means further to convert the mechanical vibrations back to electric signals, such means, generally, serving as either time or phase delay means or means to determine the transmission frequency of the coupling network.










Patents under this class:

Patent Number Title Of Patent Date Issued
8680918 High voltage driver amplifier for piezo haptics Mar. 25, 2014
8674761 Digital charge amplifier and method for converting charge signals into digital signals Mar. 18, 2014
8525591 Signal level conversion circuit, physical quantity detection device and electronic apparatus Sep. 3, 2013
8508217 Output circuit of charge mode sensor Aug. 13, 2013
8446220 Method and apparatus for increasing the effective resolution of a sensor May. 21, 2013
8242840 Capacitive sensor Aug. 14, 2012
7800443 Circuit arrangement for providing an analog signal, and electronic apparatus Sep. 21, 2010
7505600 Processor control of an audio transducer Mar. 17, 2009
7414466 Apparatus for reducing offset voltage drifts in a charge amplifier circuit Aug. 19, 2008
7049729 Amplifier converting charge signal May. 23, 2006
7042288 Charge amplifier for piezoelectric pressure sensor May. 9, 2006
6972619 Amplifier with a gain proportional to power source voltage Dec. 6, 2005
6781457 Drop amplifier housing with multiple tiers Aug. 24, 2004
6714070 Differential charge amplifier with built-in testing for rotation rate sensor Mar. 30, 2004
6624693 Amplification circuit for electric charge type sensor Sep. 23, 2003
6621341 Diagnostic medical ultrasound systems having a method and circuitry for front-end gain control Sep. 16, 2003
6459245 Voltage supply for a sensor unit and acceleration sensor unit with such a voltage supply Oct. 1, 2002
6392477 Amplification circuit for electric charge type sensor May. 21, 2002
6246287 Amplifier for piezoelectric acceleration sensor Jun. 12, 2001
6218898 Circuitry for measuring piezoelectric signals Apr. 17, 2001
6107881 Electronic interface circuit between a piezoelectric transducer and a circuit for processing a measuring signal provided by the transducer Aug. 22, 2000
6025762 Delay line incorporating a surface acoustic wave ladder filter and method of providing same Feb. 15, 2000
5446415 Intermediate frequency amplifier circuit Aug. 29, 1995
5130669 Apparatus for driving a mechanical resonator from a high impedance source Jul. 14, 1992
4492928 Comb filter Jan. 8, 1985
4381487 Resonator coupled differential amplifier Apr. 26, 1983
4268807 Band-pass filter and gain stage May. 19, 1981
4247827 Surface acoustic wave filter arrangement Jan. 27, 1981
4227156 Circuit for at least two frequencies Oct. 7, 1980
4021761 Filter circuit having an acoustic surface-wave filter device May. 3, 1977
4006437 Frequency filter Feb. 1, 1977











 
 
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