Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1988-05-17
1990-04-03
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330306, 331108B, H03F 345, H03B 524
Patent
active
049144014
ABSTRACT:
The invention can be related to the technical field of implementation and control of electricity controllable active fibers.
In accordance with the invention filters are controlled and implemented with the aid of a differential gain stage. Said stage includes pairs of like amplification components (Q.sub.I11 and Q.sub.I21, Q.sub.I12 and Q.sub.I22, Q.sub.I13 and Q.sub.I23), and groups of series-connected diode components as well as at least one current generator (Q1, Q2, Q3). The forward voltage drop of the diode components has the same current responsiveness as the base-emitter voltage of the amplification components. A filter of the first order includes a differential gain stage with a capacitive component (C) connected across the output of said stage or to its amplification components. A filter of the second order can include two differential gain stages, each with its capacitive component (C1, C2) in circuit. An oscillator for controlling filters can comprise three series-connected lowpass filters each including its differential gain stage.
REFERENCES:
patent: 3453553 (1969-07-01), Overbeek et al.
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patent: 4288754 (1981-09-01), Okada et al.
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patent: 4306198 (1981-12-01), Okada
patent: 4379268 (1983-04-01), Nagata
patent: 4605906 (1986-08-01), Miller
Mullins James B.
Telefonaktiebolaget L M Ericsson
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