Low noise amplifier

Details Low noise amplifier Low noise amplifier

1998-01-07

1999-08-31

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including plural stages cascaded

330148, H03F 304, H03F 300

Patent

active

059458801

ABSTRACT:
An amplifier, suitable for radio frequency applications, has good noise properties because of a special transistor configuration. A pair of transistors is connected in a cascode configuration, to overcome the Miller effect. The transistors have their bases driven by a common current source. The main current paths from ground to each of the output terminals are essentially noise-free. One of the transistors, acting as a transconductance amplifier, does introduce some noise though this is minimized by the use of an inductor. A third transistor forms a current source for the current path to one of the output terminals. A differential output is achieved at the output terminals because the pair of transistors has complementary outputs. In another embodiment, a capacitor is connected across the collector and base electrodes of one of the transistors to introduce a further stage of gain.

REFERENCES:
patent: 3972003 (1976-07-01), Schroeder
patent: 4049977 (1977-09-01), Radovsky
patent: 4159489 (1979-06-01), Braitberg
patent: 4485351 (1984-11-01), Schemmel et al.
patent: 4956615 (1990-09-01), Bohme et al.

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