Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2005-11-08
2005-11-08
Mottola, Steven J. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S257000, C330S261000
Reexamination Certificate
active
06963244
ABSTRACT:
A common mode linearized input stage comprises NPN and PNP differential pairs biased with respective tail currents at respective common emitter nodes, with each pair connected to receive a differential input signal. A tail current modulation circuit generates complementary output currents as a function of the voltage difference between the common emitter nodes, and first and second tail current sources generate the tail currents as a function of the complementary output currents. The tail current modulation circuit and the first and second tail current sources are arranged such that the magnitudes of the tail currents increase with an increasing differential input signal.
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patent: 6486737 (2002-11-01), Carter
“The Multi-tanh Principle, A Tutorial Overview”, Barrie Gilbert, IEEE Journal of Solid-State Circuits, vol. 33, No. 1, Jan. 1998, pp. 2-17.
If Amplifiers For Monolithic Bipolar Communications Systems, Barrie Gilbert, Analog Devices, Inc. 1996, pp. 36-37.
Analog Devices Inc.
Koppel, Jacobs Patrick & Heybl
Mottola Steven J.
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