High frequency amplifier in an integrated circuit

H - Electricity – 03 – F

Patent

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Details

H03F 3/195 (2006.01) H03F 3/26 (2006.01) H03F 3/30 (2006.01) H03F 3/343 (2006.01)

Patent

CA 2485657

The invention relates to an amplifier in an integrated circuit at a power of several hundreds of milliwatts and frequencies of from 1 to several gigahertz. The last stage of the amplifier comprises two inputs for signals for amplification (E and E'), differentially receiving an amplification signal and four principal transistors of the same conductivity type, each having a base, emitter and collector, amongst which are a first transistor or output transistor (Q1), wired with common emitter, the collector of which is connected to an output (S) of the integrated circuit, a second transistor (Q2), wired as a voltage follower, between the point (E) and the base of the output transistor, a third transistor (Q3), wired with common emitter, having the collector thereof connected to the base of the output transistor, a fourth transistor (Q4), wired as a voltage follower, with the base thereof connected to the point (E') and the emitter thereof connected to the base of the third transistor. Said circuit further comprises a first current source (M2), connected to the base of the first transistor and a second current source (M4) connected to the base of the third transistor and to the emitter of the fourth transistor.

L'invention concerne un amplificateur en circuit intégré, apte à fournir un signal amplifié sous une puissance de quelques centaines de milliwatts à des fréquences de un à quelques gigahertz. Le dernier étage de l'amplificateur comprend deux points d'entrée de signal à amplifier E et E' recevant en différentiel un signal à amplifier, et quatre transistors principaux de même type de conductivité, ayant chacun une base, un émetteur et un collecteur, parmi lesquels un premier transistor ou transistor de sortie (Q1) monté en émetteur commun, dont le collecteur est relié à une sortie (S) du circuit intégré, un deuxième transistor (Q2) monté en suiveur de tension entre le point E et la base du transistor de sortie, un troisième transistor (Q3) monté en émetteur commun, ayant son collecteur relié à la base du transistor de sortie, un quatrième transistor (Q4) monté en suiveur de tension ayant sa base reliée au point E' et son émetteur relié à la base du troisième transistor, le circuit comprenant encore une première source de courant (M2) reliée à la base du premier transistor et une deuxième source de courant (M4) reliée à la base du troisième transistor et à l'émetteur du quatrième transistor.

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