Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1996-03-04
1998-10-20
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330255, 330311, 330260, H03F 345
Patent
active
058252444
ABSTRACT:
An amplifier circuit having four variable impedance nodes is provided. The amplifier has split transconductance current paths. Each half of the amplifier has two such current paths and each current path has a node which may be either a high impedance or low impedance node. Connected between the two nodes is a transistor which is utilized in driving the nodes to their either high or low impedance state. The invention is particularly useful in a folded cascode amplifier used for driving loud speakers. However, the circuitry may also be used in other amplifiers or other applications. Further, the linearity of the amplifier's transfer curve may be improved to provide improved performance for high resistive loads. Thus, a class A-B amplifier is provided which can drive a wide range of resistive loads with varying linearity requirements. Moreover, the amplifier can be programmed to provide a high linearity region depending on the desired application.
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Crystal Semiconductor
Egan Richard D.
Mullins James B.
Violette J. P.
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