Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1988-12-29
1989-09-05
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330268, 330310, H03F 326
Patent
active
048642495
ABSTRACT:
A nonslewing amplifier comprises two push-pull voltage-amplification stages each having a complementary pair of grounded-emitter transistors. The first stage has a load impedance connected to each of the transistor collectors. A pair of feedback compensation capacitors are each connected from the collector output to the base input of a respective transistor of the second stage. When a large fast signal causes slewing in one half of these stages due to insufficient current from the respective load impedance to charge the associated compensation capacitor at the rate required by the signal, the transistor in the other half of the first stage draws enough current to discharge the other compensation capacitor at a rate fast enough to transmit an undistorted signal to the second stage where it is amplified and transmitted to the following drive stage. Slew limiting and transient intermodulation distortion are thereby avoided.
REFERENCES:
patent: 3537023 (1970-10-01), Myer
patent: 4622482 (1986-11-01), Ganger
patent: 4728903 (1988-03-01), Reiffin
patent: 4814723 (1989-03-01), Botti
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