Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1999-02-22
2000-08-08
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330261, H03F 345
Patent
active
061007595
ABSTRACT:
A low noise integrated differential AC amplifier includes a cascode differential input stage comprising first and second branches. The first branch includes a first input transistor and the second branch includes a second input transistor. Each transistor has a collector and an emitter, and the emitters being connected together to define a common emitter node. The amplifier also includes two output stages connected to respective outputs of the first and second branches. Each output stage may include a common collector transistor stage including a bias current generator and a feedback circuit. A first biasing circuit forces a first biasing current through the first input transistor by injecting the first biasing current on the collector thereof. A second biasing circuit forces a second biasing current through the first input transistor by injecting the second biasing current on the collector thereof. A resistance is connected between the common emitter node of the first and second input transistors and a common supply node of the circuit. The low noise amplifier may be used in a radio frequency receiver.
REFERENCES:
patent: 5057788 (1991-10-01), Ushida et al.
patent: 5552742 (1996-09-01), Perkins
patent: 5610547 (1997-03-01), Koyama et al.
Palmisano Giuseppe
Sirna Guglielmo
Galanthay Theodore E.
Nguyen Khanh Van
Pascal Robert
STMicroelectronics S.r.l.
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