Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1986-10-08
1988-01-05
Wan, Gene
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330254, H03F 345
Patent
active
047178876
ABSTRACT:
Differential amplifier stage, having circuit elements for setting the gain to zero, includes a first transistor and a second transistor, whose bases are respectively connected to the positive terminal of a voltage source by a first current generator and a second current generator and are also respectively connected to the emitters of a third and a fourth transistor via a first and a second diode. The emitters of the first and second transistors are both coupled to the negative terminal of the voltage source by means of a third current generator. The collectors of the third and fourth transistors are connected to the negative terminal of the voltage source. The base terminals of the third and fourth transistors respectivlely form first and second input terminals. On the other hand, the collector terminals of the first and second transistors form first and second output terminals. The differential amplifier stage includes a fifth transistor whose collector is respectively connected to the bases of the first and second transistors via a third and a fourth diode, and whose emitter is connected to the negative terminal of the voltage source. The base terminal of this fifth transistor forms an inhibit terminal for setting the gain of the amplifier stage to zero.
REFERENCES:
patent: 4575687 (1986-03-01), Moore, Jr.
Botti Edoardo
Stefani Fabrizio
SGS Microelettronica SpA
Wan Gene
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