Amplifiers – Signal feedback – Amplifier in signal feedback path
Patent
1984-03-22
1985-09-24
Mullins, James B.
Amplifiers
Signal feedback
Amplifier in signal feedback path
330108, 330107, H03F 368
Patent
active
045435367
ABSTRACT:
A charge amplifier includes an operational amplifier having first and second voltage dividers across its output connected to a capacitor and a resistor, respectively, in an R-C network returned to one input for magnifying the apparent value of the impedance of the capacitor and of the resistance of the resistor. Its output is also connected to an integrating network including another operational amplifier having its output supplied to a third voltage divider supplying signal to another input of the first operational amplifier. A pair of differentially coupled piezoelectric charge sources supply signal to the amplifier through filters and the second voltage divider has a portion shunted by a parallel connection of back-to-back diodes and another resistor for effectively attenuating response to low frequency signals.
REFERENCES:
patent: 4227155 (1980-10-01), Lerma
Cook, George and Elder, William F., "Feedback T Yields High Input Impedance", Electronics, Apr. 17, 1967, p. 91.
Camasto Nicholas A.
Fisher Controls International Inc.
Kubly Dale A.
Mottola Steven J.
Mullins James B.
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