US 6,982,598 B2
Differential amplifier
Ralph Oppelt, Uttenreuth (Germany)
Assigned to Siemens Aktiengesellschaft, Munich (Germany)
Filed on Nov. 06, 2003, as Appl. No. 10/702,035.
Claims priority of application No. 102 51 702 (DE), filed on Nov. 06, 2002.
Prior Publication US 2004/0145414 A1, Jul. 29, 2004
Int. Cl. H03F 3/45 (2006.01)
U.S. Cl. 330—256 4 Claims
OG exemplary drawing
 
1. A differential amplifier, comprising:
two amplifier transistors arranged in parallel paths and having emitters, respectively;
a compensation resistor connecting the emitters of said two amplifier transistors and having a negative temperature coefficient;
a common emitter line connected to the emitters of said two amplifier transistors; and a current source, connected to said common emitter line, to produce a quiescent current independent of temperature.