Amplifiers – Bootstrap coupling
Patent
1990-12-03
1992-08-18
Mullins, James B.
Amplifiers
Bootstrap coupling
330260, 330294, H03F 134
Patent
active
051402793
ABSTRACT:
A high speed feedback amplifier is frequency compensated utilizing circuitry that does not cause distortion in the amplifier nor does it limit the slew rate of the amplifier. In one embodiment compensation circuitry drives one side of the compensation capacitor forcing the signal voltage across the compensation capacitor to zero while still providing bandwidth compensation. Since no current gets driven into the capacitor, no distortion or slew limitations are created by the compensation. In a second embodiment the voltage across the compensation capacitor is allowed to change, however the signal current for the compensation capacitor is supplied by a linear charging circuit which removes this charging requirement from the amplifier. Therefore, as in the first embodiment, no distortion or slew limitation is created by the addition of the frequency compensation.
REFERENCES:
patent: 4405900 (1983-09-01), van de Plassche
patent: 4739281 (1988-04-01), Doyle
Data Sheet for the OP-05 Instrumentation Operational Amplifier, PMI Data Book Precision Analog Integrated Circuits, pp. 5-46 through 5-54, 1988.
Data Sheet for the OP-01 Inverting High-Speed Operational Amplifier, PMI Data Book Precision Analog Integrated Circuits, pp. 5-24 through 5-29, 1988.
Data Sheet for the LM118/LM218/LM318 Operational Amplifiers. Linear Data Book National Semiconductor Corporation, pp. 3-165 through 3-171, 1982.
Erdi, George, et al., "A Precision FET-Less Sample-and-Hold with High Charge-to-Droop Current Ratio," IEEE Journal of Solid-State Circuits, vol. SC-13, No. 6, Dec. 1978, pp. 864-873.
Precision Monolithics, Inc., Data Sheet for the OP-05 Instrumentation Operational Amplifier, Jun. 1987.
Precision Monolithics, Inc., Data Sheet for the OP-01 Inverting High-Speed Operational Amplifier, Jun. 1987.
National Semiconductor Data Sheet for the LM118/LM218/LM318 Operational Amplifiers. 1982 National Semiconductor Data Book.
Crystal Semiconductor Corporation
Mullins James B.
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