Amplifiers – With semiconductor amplifying device – Including plural amplifier channels
Patent
1986-10-07
1988-11-08
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including plural amplifier channels
330255, 330257, 330261, H03F 345, H03F 368
Patent
active
047836377
ABSTRACT:
The front end of an operational amplifier having an improved slew rate and high gain current output capabilities. The amplifier includes a slew enhancement or large signal stage connected in parallel to a normal front end or small signal stage. The small signal stage supplies a transconductance output which is approximately linearly related to the input until its slew rate limit. The slew enhancement stage is designed to provide slew current when the small signal stage reaches a selected threshold such as its slew rate limit, thereby providing an increased output current response to an increasing differential input voltage beyond the slew rate of the small signal stage. The large signal stage can be optimized to provide a greater input linear dynamic range, faster slew rate and improved efficiency.
REFERENCES:
patent: 3801858 (1974-07-01), Grangaard
patent: 3922614 (1975-11-01), Van De Plassche
patent: 4227256 (1980-10-01), O'Keefe
patent: 4236120 (1980-11-01), White
patent: 4240040 (1980-12-01), Saari
patent: 4250460 (1981-02-01), Gasparik
patent: 4390850 (1983-06-01), Davis et al.
patent: 4446443 (1984-05-01), Johnson et al.
patent: 4531099 (1985-07-01), Nakane
Harris Corporation
Krawczyk Charles C.
Mullins James B.
Troner William A.
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