Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1986-05-08
1987-10-27
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330260, 330261, 307555, 307567, H03F 345
Patent
active
047032847
ABSTRACT:
The invention relates to a high-frequency amplifier which comprises only two cascaded differential stages. The collectors of the transistors (T.sub.1, T.sub.2) of the differential input stage are connected to the emitters of two transistors (T.sub.3, T.sub.4) which have feedback between their collectors and bases and which are biased by means of resistors (R.sub.1, R.sub.2). This input stage forms a resonant circuit. The differential output stage comprises transistors (T.sub.6 and T.sub.7) whose emitters are interconnected by a phase-lead capacitor (C.sub.1) and two resistors (R.sub.8, R.sub.9). Such an arrangement enables a high gain to be obtained over the entire operating frequency range of the amplifier and in particular for high frequencies.
REFERENCES:
patent: 3660773 (1972-05-01), Free
patent: 4418321 (1983-11-01), Bohme
patent: 4547744 (1985-10-01), Kasperkovitz
Briody Thomas A.
Mullins James B.
Rich Marianne R.
Streeter William J.
U.S. Philips Corporation
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