Amplifiers – Signal feedback – Phase shift means in loop path
Patent
1993-01-14
1994-12-06
Mullins, James B.
Amplifiers
Signal feedback
Phase shift means in loop path
123425, 330294, 330 85, 330108, 330109, H03F 136
Patent
active
053714725
ABSTRACT:
A charge amplifier for sensors outputting electrical charge, particularly for piezoceramic pressure sensors, includes a voltage integrator having an output, an integration capacitor and a resistor connected parallel to the integration capacitor. A current-to-voltage converter is connected upstream of the voltage integrator and has an input. A negative feedback branch has a series circuit of a farther voltage integrator and a voltage-to-current converter. The negative feedback branch is connected between the output of the voltage integrator and the input of the current-to-voltage converter.
REFERENCES:
patent: 4398104 (1983-08-01), Podhrasky
patent: 4543536 (1985-09-01), Pederson
patent: 4760345 (1988-07-01), Busser et al.
Roger Melen, Tunable active filter maintains constant Q, Electronics Jul. 19, 1971 p. 72.
Electronics Today vol. 10 #11 Nov. 1981 titled "State Variable Filter".
Electronic Engineering, Oct. 1972 titled Low Power Triple Op Amp Siliconix L144.
IEE Proceedings Sections A a I, vol. 130(1983)Jun. No. 3, Part G, Old Woking, Surrey, Great-Britain, P. S. R. Diniz et al: "High-Performance Integrators and Applications in 2-Integrated Loop Biquads".
Dudek James
Greenberg Laurence A.
Lerner Herbert L.
Mullins James B.
Siemens Aktiengesellschaft
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