Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1994-08-05
1995-11-07
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330258, 330305, 330311, H03G 330, H03F 345
Patent
active
054650720
ABSTRACT:
An amplifier capable of being tuned to provide linear gain over a selected input signal range is disclosed herein. The amplifier includes an input stage for receiving an input signal. The amplifier further includes a tuning circuit, connected between the input stage and an amplifier output stage, for controlling gain of the amplifier by adjusting a tuning current supplied to the amplifier output stage. The tuning circuit may be realized with a differential transistor pair connected to a pair of transistors within the output stage. In a preferred implementation the input and output stages are arranged in a folded-cascode configuration so as to improve the output impedance and input common-mode signal range of the amplifier.
REFERENCES:
patent: 3731215 (1973-05-01), Peil et al.
patent: 5111159 (1992-05-01), Arakawa
patent: 5166635 (1992-11-01), Shih
patent: 5168243 (1992-12-01), Feliz et al.
Liu, "Differential Variable-Gain Amplifier" IBM Technical Disclosure Bulletin, vol. 15, No. 5 Oct. 1972, pp. 1444-1445.
M. Koyama et al., "A 10.7 MHz Continuous-Time Bandpass Filter Bipolar IC", Reprinted from IEEE Proc. CICC, pp. 25.2.1-25.2.4, 1989.
Linear Technology Corporation
Mullins James B.
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