Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1989-10-10
1990-11-13
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330258, 330255, H03F 345
Patent
active
049704702
ABSTRACT:
An integrated-circuit (IC) transimpedance amplifier having a successive series of DC-coupled balanced symmetrical amplifier stages with overall current feedback. The input stage includes a pair of series-connected NPN/PNP transistor with common emitters serving as the inverting input terminal. The second stage includes a cross-coupled transistor quad with the bases of the first quad pair coupled to the collectors of the first stage transistors. The inter-stage coupling circuit includes a series string of diodes connected between the collectors of the first stage transistor pair. The input stage transistor pair is identical to the transistor pairs of the second stage quad, and all of those transistors carry identical DC currents. An output stage amplifier is driven by a signal from the collectors of the first transistor pair of the second stage quad. The second transistor pair of the quad is coupled to the output stage through current mirrors to augment the output signal.
REFERENCES:
patent: 3944944 (1976-03-01), Ellenbecker et al.
patent: 4229705 (1980-10-01), Tukahashi et al.
patent: 4595883 (1986-06-01), Nakayama
Analog Devices Incorporated
Mottola Steven
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