Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1994-04-01
1995-07-11
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330308, 330110, H03F 345, H03F 308
Patent
active
054324742
ABSTRACT:
An improved method and circuitry for processing high-impedance (current mode) input signals for use in translinear and other mode circuits in a manner that avoids the signal dependent bandwidth variations that occur in the prior art. A non-linear feedback structure using a transconductance gain element is employed to extend the bandwidth and/or suppress bandwidth variations encountered in the prior art. One application of this invention is the extension of Gilbert amplifier topologies, with their attendant normalization and integrated circuit implementation advantages, for operation with very low input signal levels to high bandwidth applications. A further extension in this invention allow this transconductance to be electrically adjusted to allow active bandwidth control or to compensate for signal sources with different input capacitances. The invention is particularly suitable for use as a preamplifier for pairs of sensed photodetector current signals.
REFERENCES:
patent: 3931583 (1976-01-01), Gilbert
patent: 4396891 (1983-08-01), Johansson et al.
patent: 4492931 (1985-01-01), Deweck
patent: 4502017 (1985-02-01), Van De Plassche et al.
patent: 4608542 (1986-08-01), Siegel
patent: 4881043 (1984-11-01), Jason
patent: 4902982 (1990-02-01), Moore et al.
patent: 5254957 (1993-10-01), Lauffenburger
patent: 5276407 (1994-01-01), Mead et al.
"Current-mode Circuits From A Transliner Viewpoint: A Tutorial" by B. Gilbert, pp. 11-19 and 55-64 of Ch. 2 of Analogue IC Design: the current-mode approach, C. Toumazou, F. J. Lidgey & D. G. Haigh, eds., published by Peter Peregrinus Ltd., London (1990).
"A New Wide-Band Amplifier Technique," by Barrie Gilbert, IEEE Journal of Solid-State Circuits, vol. SC-3, No. 4, pp. 194-206 (Dec. 1968).
Lauffenburger James H.
Moore George S.
Armijo Dennis F.
Honeywell Inc.
Johnson Kenneth J.
Mottola Steven
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