Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1990-01-12
1991-06-04
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, H03F 345
Patent
active
050217445
ABSTRACT:
In a differential amplifier the input signal is applied between a first input terminal (1), formed by the bases of a first (T1) and a third (T3) transistor, and a second input terminal (2), formed by the bases of a second (T2) and a fourth (T4) transistor. The emitters of the third and the fourth transistor are coupled to a first supply-voltage terminal (Vee) by means of a first (J1) and a second (J2) current source, respectively, and to the mutually coupled emitters of the first and the second transistor by means of a first (R1) and a second (R2) resistor. The collectors of the third and the fourth transistor are coupled to a second supply voltage terminal (Vcc) by means of both a fifth resistor (R5) and the base-collector junction of a fifth transistor (T5). The collectors of the first and the second transistors constitute the first (3) and the second (4) output terminal, respectively, and are coupled to the emitter of the fifth transistor by means of a third (R3) and a fourth (R4) resistor. By providing a correct bias, the output voltages will exhibit class-A behaviour so that both a single-ended and a differential signal can be readily obtained.
REFERENCES:
patent: 4547744 (1985-10-01), Kasperkovitz
patent: 4951003 (1990-08-01), De Jager et al.
Franzblau Bernard
Mottola Steven
U.S. Philips Corporation
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