Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1988-12-22
1990-04-24
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330311, H03F 345
Patent
active
049203215
ABSTRACT:
An amplifier circuit wherein the output signal of an npn long-tailed transistor pair amplifier stage (1) is referenced to a first power supply point (5). In order to transfer this signal to the input of a second npn stage without using pnp transistors and without noise on the first supply point becoming superimposed on the signal, an intermediate stage (2) is provided. The intermediate stage comprises a current mirror (10) to the input and output of which are coupled the respective collectors of the pair transistors (3,4) via respective emitter followers (13,15) and respective resistors (14,16). The values of these resistors, the load resistors (6,7) of the pair transistors, and the current gains of the emitter followers and the current mirror are chosen such that any change in the potential on the output (17) of the intermediate stage (2) relative to a second power supply point (8), which would otherwise result from a change in the potential on the first supply point (5) relative to that on the second supply point, is compensated for by a change in the mirror output current, thus producing changes in the currents through two of the resistors (7,16).
REFERENCES:
patent: 4600893 (1986-07-01), Sugimoto
patent: 4710728 (1987-12-01), Davis
patent: 4839609 (1989-06-01), Hara et al.
Franzblau Bernard
Mottola Steven
U.S. Philips Corporation
LandOfFree
Amplifier circuit arrangement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Amplifier circuit arrangement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Amplifier circuit arrangement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-36141