Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1998-11-27
2000-08-22
Shingleton, Michael B
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330259, 330261, 330296, H03F 114
Patent
active
061078840
ABSTRACT:
The invention is an improvement to an amplifier configuration employing an amplification stage (e.g., an operational amplifier) biased via biasing terminals and a follower stage (e.g., an emitter-follower BJT pair), the follower stage being capable of producing the same voltage as the amplification stage but at a higher current. The improvement consists of feeding a fraction of the output voltage of the follower stage to the biasing terminals of the amplification stage. Specifically, the output of the follower stage is connected to the biasing terminals via a common bootstrap resistor and respective capacitors. The capacitors behave as a DC block and as an AC short-circuit. The biasing terminals are then connected to respective biasing resistors which could then be connected to respective supply voltage sources. In this way, the maximum permitted amplitude of the output voltage is increased, leading to less distortion and less frequent saturation of transistors in the amplification stage.
REFERENCES:
patent: 3961280 (1976-06-01), Sampei
patent: 4001707 (1977-01-01), Iguchi
patent: 4484147 (1984-11-01), Metz
patent: 5315263 (1994-05-01), Mudra et al.
patent: 5786729 (1998-07-01), Smith
Nortel Networks Corporation
Shingleton Michael B
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