Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1980-01-29
1981-05-05
Safourek, Benedict V.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358158, 330257, 307352, H04N 504
Patent
active
042662451
ABSTRACT:
A differential amplifier is provided, including first and second emitter coupled transistors responsive to an input signal applied to one of their base electrodes, and a current source transistor having its collector-to-emitter path serially coupled between the coupled emitters of the first and second transistors and a point of reference potential. A current repeater circuit is coupled between the collector electrodes of the first and second transistors which comprises a current mirror for replicating the collector current of the first transistor. The current mirror includes third and fourth transistors having respective collector electrodes coupled to the collector electrodes of the first and second transistors, respectively, the base electrode of the third transistor being coupled to the base electrode of the fourth transistor, and a resistor for coupling the emitter electrode of at least one of the third and fourth transistors to a source of supply voltage. The collector current of the first transistor is substantially replicated by the collector current of the fourth transistor. A fifth transistor has its collector-to-emitter path serially coupled between the base electrodes of the third and fourth transistors and the resistor, and is biased to conduct a given magnitude of current when the third and fourth transistors are nonconductive and to lessen its conduction when the third and fourth transistors are conducting current.
REFERENCES:
patent: 3815037 (1974-06-01), Wheatley
patent: 3863080 (1975-01-01), Steckler
patent: 3927331 (1975-12-01), Nakashima
patent: 4093963 (1978-06-01), Uchida
patent: 4144545 (1979-03-01), Fernsler
patent: 4159482 (1979-06-01), Apeldoorn
patent: 4216396 (1980-08-01), Balaban
Balaban Alvin R.
Steckler Steven A.
Masinick Michael A.
Meagher W. H.
Rasmussen P. J.
RCA Corporation
Safourek Benedict V.
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