Global Patent Index - EP 0893880 B8

EP 0893880 B8 20040303 - Amplifier stage with constant input impedance

Title (en)

Amplifier stage with constant input impedance

Title (de)

Verstärkerstufe mit konstanter Eingangsimpedanz

Title (fr)

Etage amplificateur à impédance d'entrée constante

Publication

EP 0893880 B8 20040303 (DE)

Application

EP 98112141 A 19980630

Priority

DE 19731459 A 19970722

Abstract (en)

[origin: EP0893880A1] The amplifier stage has an arrangement for setting the operating point of the amplifier stage that is connected on one side to the base connections of third and fourth transistors (T3, T4) and on the other side to a first reference potential (M). A third current source is connected, on one side, to the base connections of the third and fourth transistors and on the other side to a second reference potential (Vcc). The collectors of the first to fourth (T1-T4) transistors are the outputs of the amplifier stage.

IPC 1-7

H03F 3/45

IPC 8 full level

H03F 3/45 (2006.01)

CPC (source: EP)

H03F 3/45479 (2013.01)

Designated contracting state (EPC)

DE FR GB SE

DOCDB simple family (publication)

EP 0893880 A1 19990127; EP 0893880 B1 20031126; EP 0893880 B8 20040303; DE 59810241 D1 20040108; US 5973562 A 19991026

DOCDB simple family (application)

EP 98112141 A 19980630; DE 59810241 T 19980630; US 12060498 A 19980722