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A Low-Noise Amplifier

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3 Author(s)
Wallman, H. ; Massachusetts Institute of Technology, Cambridge, Mass. ; Macnee, Alan B. ; Gadsden, C.P.

This paper describes an amplifier circuit which yields very low noise factor, consisting of a grounded-cathode triode followed by a grounded-grid triode. The combination is entirely noncritical and provides the low noise factor of a triode with the high amplification and stability of a pentode. Noise factors averaging 0.25 db at a carrier frequency of 6 Mc. and 1.35 db at 30 Mc. have been achieved. Typical circuit details are given.

Published in:

Proceedings of the IRE  (Volume:36 ,  Issue: 6 )