Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1996-09-19
1999-08-03
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330261, H03F 345
Patent
active
059330546
ABSTRACT:
A bipolar OTA having a wide input voltage range is provided without increasing the circuit scale and current consumption. This OTA includes a first differential pair of emitter-coupled first and second bipolar transistors, a second differential pair of emitter-coupled third and fourth bipolar transistors, a common current source or sink connected to the coupled emitters of the first to fourth transistors. The first to fourth transistors are driven by a common tail current produced by the common current source or sink. A first input voltage as an input signal to be amplified is differentially applied across the bases of the first and second transistors. A second input voltage, which is produced by attenuating the first input voltage, is differentially applied across the bases of the third and fourth transistors. First and second dc offset voltages are applied to the bases of the third and fourth transistors, respectively. An output current as an amplified output signal is differentially derived from collectors of the first and second transistors. A fifth bipolar transistor driven by the common current source or sink may be additionally used for applying a third input voltage.
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H. Tanimoto, et al., "Realization of a 1-V Active Filter Using a Linearization Technique Employing Plurality of Emitter-Coupled Pairs", IEEE Journal of Solid-State Circuits, vol. 26, No. 7, Jul. 1991, pp. 937-945.
Mullins James B.
NEC Corporation
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