Amplifier arrangement having a relatively stable reference poten

Details Amplifier arrangement having a relatively stable reference poten Amplifier arrangement having a relatively stable reference poten

1994-03-18

1995-05-02

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330288, H03F 345

Patent

active

054123453

ABSTRACT:
In order to minimize signal influences on the reference potential in a rail-to-rail amplifier arrangement this arrangement comprises a first differential amplifier which comprises a first and a second transistor whose emitters are coupled to a reference potential via a common first resistor, the collector of the first transistor forming the output node of the amplifier arrangement, a second differential amplifier to whose input side the input signal of the amplifier arrangement is applied, whose output side is coupled to the base of the first transistor of the first differential amplifier, and having an inverting input coupled to the output node of the amplifier arrangement, a first current mirror circuit having an input transistor to which a reference current is applied, having an output transistor which is formed by the second transistor of the first differential amplifier, and having the emitter side of both transistors coupled to a reference potential, and a second current mirror circuit to whose input side the output signal of the first current mirror circuit is applied and whose output side is coupled to the output node of the amplifier arrangement, which second current mirror circuit has two transistors coupled to a supply potential at the emitter side, which transistors are scaled in such a manner that the current supplied by the amplifier arrangement at its output side is twice as large as the input current applied to the arrangement.

REFERENCES:
patent: 5266852 (1993-11-01), Shigenari et al.

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