Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1981-04-03
1983-10-04
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330310, H03F 345
Patent
active
044081677
ABSTRACT:
A multi-stage current mode differential amplifier is disclosed in which each cascaded stage includes a pair of input transistors which have their bases connected to a common voltage source and a pair of control transistors which have their emitters connected to a common current source. A diode-like device is inserted between the collector of a control transistor in one stage and the emitter of an input transistor of the succeeding stage which increases the input impedance seen by the control transistor, thereby permitting an increase in amplification for that stage. In both embodiments, the current signal is amplified at a higher rate than the rate of increase of the bias currents supplied to the emitters of the control transistors in each stage. In one embodiment, the arrangement of the diode in the collector circuit of the control transistor permits the voltage sources connected to the bases of the input transistors to remain substantially constant for each cascaded stage in contrast to prior art devices where the voltages had to be increased for each additional stage.
REFERENCES:
patent: 3689752 (1972-09-01), Gilbert
Nagaikin, "Wideband Amplifiers With Diode Interstage Coupling", Instruments and Experimental Techniques, vol. 20, No. 3, 1977, New York, pp. 754-756.
Rogers Dennis L.
Widmer Albert X.
Cummins Richard E.
International Business Machines - Corporation
Mullins James B.
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