DocumentCode
1968800
Title
The Application of Negative Feedback to Microwave Bipolar Transistor Amplifiers
Author
Walker, J.L.B. ; Hughes, E. ; Wilson, K.
Author_Institution
General Electric Co. Ltd., Hirst Research Centre, Wembley, Middlesex, England.
fYear
1976
fDate
14-17 Sept. 1976
Firstpage
530
Lastpage
533
Abstract
It is shown that RLC feedback between the base and collector of a microwave bipolar transistor enables one to design a single-stage unbalanced amplifier with a two-octave bandwidth (0.5 - 2.0 GHz). Over this bandwidth the measured terminal v.s.w.r.´s are within 2:1, the gain variation is ±1dB and a noise figure ¿4.6 dB has been achieved. The advantages of feedback are: (i) circuit design is simplified (ii) it is more economical than a balanced approach (iii) the gain of the amplifier can be varied by 3 dB by altering the collector current without degrading the terminal matches (iv) feedback reduces the effect of changes in transistor s-parameters (v) the amplifier is immune to parametric overload instabi1ities[1].
Keywords
Bandwidth; Bipolar transistors; Circuit synthesis; Degradation; Gain measurement; Microwave amplifiers; Negative feedback; Noise figure; Noise measurement; Scattering parameters;
fLanguage
English
Publisher
ieee
Conference_Titel
Microwave Conference, 1976. 6th European
Conference_Location
Rome, Italy
Type
conf
DOI
10.1109/EUMA.1976.332331
Filename
4130997
Link To Document