Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1991-10-04
1993-01-05
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330255, 330257, 330295, H03F 345
Patent
active
051774500
ABSTRACT:
A CMOS power amplifier is disclosed having a differential input amplifying stage for amplifying differential input signals, a high-gain amplifying stage, and an output stage. The high-gain amplifying stage includes a first amplifying section and a second amplifying section. The first amplifying section drives a first output section of the output stage when the voltage difference between the two inputs of the differential input amplifying stage exceeds a certain voltage value. The second amplifying section drives a second output section of the output stage when the voltage difference between the two inputs is below a certain voltage value. The output stage includes a first output section and a second output section, and the first output section consists of plural pairs of transistors for receiving the output signals of the first amplifying section of the high-gain amplifying stage, and serves as a class B push-pull amplifier. The second output section has pairs of transistors for receiving output signals of the second amplifying section of the high-gain amplifying stage to their gates, and serves as a class AB push-pull amplifier. According to the present invention, DC operating point current is decreased, and an output power equal to the supply voltage swing is produced to a low-impedance load at low current.
REFERENCES:
patent: 4480230 (1984-10-01), Brehmer
patent: 4794349 (1988-12-01), Senderowicz et al.
Bae Ylsung
Lee Bang-won
Mullins James B.
Samsung Electronics Co,. Ltd.
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