Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1998-10-14
2000-04-25
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330261, 330310, H03F 345, H03F 304
Patent
active
060548975
ABSTRACT:
In a differential amplifier comprising a non-linear distortion compensating circuit including a differential emitter follower, and a first group of current sources having a first differential pair of transistors having bases receiving a pair of emitter currents of the differential emitter follower, respectively, so that the first group of current sources are controlled by the pair of emitter currents of the differential emitter follower, and a differential buffer including a second differential pair of transistors having bases receiving signals outputted from the non-linear distortion compensating circuit, respectively, there is provided a base current compensating circuit for supplying to emitter nodes of the differential emitter follower, a current for reducing a non-linear distortion caused by base currents of the transistors of the second differential pair in the differential buffer and the transistors of the first differential pair in the first group of current sources.
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patent: 5101126 (1992-03-01), Butler et al.
patent: 5399988 (1995-03-01), Knierim
patent: 5532644 (1996-07-01), Nakagawara
patent: 5742248 (1998-04-01), Vorenkamp et al.
T. Kumamoto et al., "A 1-bit 50MS/s 500m W A/D Converter with Differential-Voltage Subconverter", Technical Report of IEICE (in Japan), ED93-47, ICD93-96 (Jun. 1994), pp. 17-22.
NEC Corporation
Nguyen Patricia T.
Pascal Robert
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