Class B push-pull differential amplifiers of the single-end outp

Details Class B push-pull differential amplifiers of the single-end outp Class B push-pull differential amplifiers of the single-end outp

1998-07-09

1999-10-12

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330292, H03F 345, H03F 114

Patent

active

059660503

ABSTRACT:
A differential amplifier includes an input differential pair constituted by differential pair transistors whose common emitter is current-biased by a negative voltage source through a constant current source. An active load is formed by interconnecting through resistors input and output of a first and second current mirror circuit whose emitters serve as positive voltage sources. A collector output of each of the input differential pair is connected to each of the outputs of the first and second current mirror circuits. An output current amplifying stage comprises three emitter-grounded current amplifying stages whose emitters serve as positive voltage sources. The first current amplifying stage includes a capacity provided between the base and collector thereof and connected to one of current mirror outputs of the active load at the base thereof. The second and third current amplifying stages are connected to the other current mirror output of the active load at a common base. One of collector outputs thereof is connected to a negative voltage source through a resistor with a capacity provided between the base and collector. The other collector output is connected to the input of a third current mirror circuit whose emitters serve as negative voltage sources.

REFERENCES:
patent: 4783602 (1988-11-01), Viswanathan
patent: 4902984 (1990-02-01), Vinn et al.
patent: 5736892 (1998-04-01), Lee
patent: 5838149 (1998-11-01), Perraud

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