Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1988-07-20
1989-12-05
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330292, 341159, H03F 114, H03F 345
Patent
active
048855480
ABSTRACT:
Wideband amplifier having a differential amplifier or single-ended amplifier and having a capacitaqnce compensation circuit is disclosed. The amplifier detects the voltage variations of a signal input node or a signal output node, generates a compensation current equal in magnitude and opposite in direction to a current flowing in a parasitic capacitance such as a transistor junction capacitance, and cancels the parasitic capacitance associated with a node by supplying the compensation current in a reverse phase to the node to which the parasitic capacitance is attached. As a result, a wideband amplifier is achieved, and it can also be used as a high-speed comparator. Further, harmonic distortions causing from the voltage dependency of the parasitic capacitance can be reduced by flowing the compensation current corresponding to a voltage impressed to the junction capacitance.
REFERENCES:
patent: 3678405 (1972-07-01), Avins
patent: 4646002 (1987-02-01), Tuszyski
Benson et al., "DC Amplifier Having Fast Response to Step Waveform Inputs", IBM Technical Disclosure Bulletin, vol. 10, No. 8, Jan. 1968, pp. 1148-1149.
Turner, "Boostrap Boosts Gain of Low-Noise RF Preamp", Electronics, May 24, 1971, p. 57.
IEE Journal of Solid-State Circuits, vol. Sc-14, No. 4, pp. 734-741.
International Journal of Electronics, vol. 34, No. 3, 1973, pp. 423-427.
Akazawa Yukio
Wakimoto Tsutomu
Mullins James B.
Nippon Telegraph and Telephone Corporation
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