H - Electricity – 03 – G
Patent
H - Electricity
03
G
330/23
H03G 3/30 (2006.01) H03G 1/00 (2006.01)
Patent
CA 1157921
PHN 9686 10 15.8.80 ABSTRACT: Variable-gain amplifier stage equipped with field-effect transistors. A variable gain amplifier stage equipped with field-effect transistors. Said stage comprises two field- effect transistor connected as a differential pair, using a controlled tail-current source as gain control, so that a slope control is obtained. The transistors connected as a differential pair each have a field-effect transistor operated in the triode region as a load, so that the sig- nal resistance of said transistors is a function of the tail current. As a result of this, the gain factor of the amplifier stage is determined by the slope of the ampli- fier transistor as a function of the tail current and by the signal-current resistance of the load transistors as a function of the control current, which over a compara- tively wide range of tail current yields a substantially linear relationship between the gain factor expressed in decibels and the tail current.
371288
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
LandOfFree
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