Improvements in or relating to amplifying circuit arrangements comprising a plurality of transistors

摘要

740,333. Transistor amplifying circuits. PHILIPS ELECTRICAL INDUSTRIES, Ltd. April 26, 1954 [April 29, 1953], No. 11986/54. Class 40 (6). In a cascaded grounded base amplifier the amplification is increased by the use of a resistor rp between the collector lead 6 of one transistor and the common base lead 4 of the transistors. It is shown that this requirement is met if rp=k(αrb-rb-re) and rp is smaller than 1/ 5 rm where k is a constant lying between 1.2 and 3, rb=total base resistance, re=the total emitter impedance and rm=the transmission impedance. A resistor 12 may be included in the base lead to provide a stabilizing effect on the transistor characteristics and also to bias the base relative to the emitter.