Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2011-01-25
2011-01-25
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S295000, C330S12400D, C330S009000
Reexamination Certificate
active
07876153
ABSTRACT:
A transconductor circuit, particularly according to the multi-tanh principle, having a first input node and a second input node, a first differential amplifier coupled to the first and second input nodes, and having a first offset voltage, and a second differential amplifier coupled to the first and second input nodes, and having a second offset voltage different from the first offset voltage. A first resistance circuit is coupled between the first differential amplifier and at least one current source, and a second resistance circuit is coupled between the second differential amplifier and the at least one current source. Varying of the current sources enables control of the transconductance without degrading linearity.
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Barrie, “The Multi-tanh Principle: A Tutorial Overview,” IEEE Journal of Solid-State Circuits, 3(1):2-17, Jan. 1998.
Jorgenson Lisa K.
Nguyen Patricia
Seed IP Law Group PLLC
STMicroelectronics Design and Application GmbH
Tarleton E. Russell
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