Linearized level-shifting amplifier

Details Linearized level-shifting amplifier Linearized level-shifting amplifier

1992-07-27

1994-04-26

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330260, H03F 345

Patent

active

053070240

ABSTRACT:
An all NPN transistor level-shifting differential amplifier has first and second identical amplifier halves, in which each amplifier half includes a passive voltage-shifting network coupled between a load and a current source. A main amplifier has a single-ended voltage input and an output coupled to the first node of the voltage shifting network. An output amplifier has a single-ended current output and an input coupled to the second node of the voltage shifting network. The main amplifier and output amplifiers are coupled together such that a portion of the bias and signal currents flowing through the output amplifier is reused and flows through the main amplifier, reducing bias current and power requirements. The first and second amplifier halves are coupled together with a gain-setting emitter resistor. In addition to reducing the power requirements of the amplifier, the feedback configuration of the level-shifting amplifier also increases linearity over prior art level-shifting amplifiers.

REFERENCES:
patent: 3622903 (1971-11-01), Steckler

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