Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1993-06-18
1994-09-06
Logan, Sharon D.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
330252, 341159, 341158, H03M 114, H03M 134, H03M 136, H03F 345
Patent
active
053452372
ABSTRACT:
The present invention is directed to improvement of a differential amplifier an its peripheral components employed in an A/D converter to enhance an accuracy of the A/D converter. The differential amplifier has an amplifying element comprised of a pair of differential transistors Q1 and Q2, emitter resistances 2a and 2b, and collector resistances 2c and 2d. The differential amplifier has transistors Q3 and Q4 constituting an emitter follower for applying an output amplified in the differential amplifying element to the outside. The differential amplifier includes transistors Q5 and Q6 having their respective base electrodes connected to input terminals 4a and 4b and serially connected to the transistors Q3 and Q4, and resistances 2e and 2f interposed between emitter electrodes of the transistors Q5 and Q6 so as to relieve any influence of variations in base-emitter voltages of the transistors Q3 and Q4. Effectively an output from the emitter follower can be improved and a gain of the differential amplifier and linearity can be also improved.
REFERENCES:
patent: 4890067 (1989-12-01), Lamb
patent: 4928073 (1990-05-01), Arai et al.
patent: 5138318 (1992-08-01), Matsuzawa
IEEE Journal of Solid-State Circuits, vol. 24, No. 1, Feb. 1, 1989, pp. 13-20, Shimizu, et al., "A 10-bit 20-MHz Two-Step Parallel A/D Converter with Internal S/H".
"Transistor Gijutsu", Dec. 1990, p. 512, FIG. 2(a).
Kouno Hiroyuki
Kumamoto Toshio
Miki Takahiro
Logan Sharon D.
Mitsubishi Denki & Kabushiki Kaisha
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