| 摘要 |
<p>An amplifier circuit arrangement comprises first and second long-tailed pairs of transistors 16, 17, each including an inductor 20, 23 to provide a constant current source for their respective transistor pair. Each of the transistors 18, 19, 21 and 22 is provided with a bias current on its base electrode. A differential input signal is applied between the base electrode of a transistor 18, via a dc blocking capacitor 29 and an input terminal 28, and the base electrode of the transistor 22, via a dc blocking capacitor 30 and an input terminal 31. A differential output signal is provided between output terminals 32 and 33. The collector electrodes of the transistors 18 and 21 are connected together and to the output terminal 32. The collector electrodes of the transistors 19 and 22 similarly are connected together and to the output terminal 33. This connection of the collectors of the transistors, which can be described as parallel connection, provides summation of the differential signals provided by the transistor pairs 16 and 17. <IMAGE></p> |
