Amplifiers – With periodic switching input-output
Patent
1989-09-29
1990-07-17
Mullins, James B
Amplifiers
With periodic switching input-output
330 51, 330301, H03F 102
Patent
active
049423673
ABSTRACT:
A switched-capacitance amplifier has a common terminal and an input signal terminal for receiving an input signal voltage therebetween, and it has an inverted output signal terminal for supplying, during each of a second series of separated time intervals interleaved without overlap with a first series of separated time intervals, an output voltage that is the negative of its input signal voltage. The switched-capacitance amplifier includes first and second capacitors. The switched-capacitance amplifier also includes a differential-input amplifier, having an output connection to the inverted output signal terminal, having a non-inverting input connection to the common terminal, having an inverting input connection, and having an input port between its non-inverting and inverting input connections. During each of the first series of separated time intervals the first and second plates of the first capacitor are respectively connected to the common terminal and to the input signal terminal, for charging the first capacitor to the input signal voltage; and the first and second plates of the second capacitor are respectively connected to the common terminal and to the inverting input connection of the differential-input amplifier, for charging the second capacitor to the input offset voltage error of that amplifier. During each of the second series of separated time intervals the first capacitor, the second capcitor and the input port of the differential input amplifier are connected in series between the inverted output signal terminal and the common terminal.
REFERENCES:
patent: 4543534 (1985-09-01), Temes et al.
"Switched-Capacitor Neural Networks", Electronics Letters, vol. 23, No. 18, pp. 958-959, 27 Aug. 1987.
"High-Frequency Switched-Capacitor Filter Using Unity Gain Buffers", A delaPlaza, IEEE Journal of Solid State Circuits, vol. SC-21, No. 3, pp. 470-477, Jun. 1986.
Davis Jr. James C.
General Electric Company
Limberg Allen L.
Mullins James B
Snyder Marvin
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