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Temperature variations effects in BJT amplifier circuits at Radio Frequencies Scientia Research LibraryJournal of Engineering and Technology Research2348 - 0424201753 Kamaljeet Singh* A V Nirmal Page No. 1-7 1 Bias stability is an important parameter in amplifier design as small shift renders oscillations in the circuits beside shift in the desired operating value. Transistor DC points are prone to changes due to temperature variations as temperature effects the intrinsic parameters of the transistor rather than the extrinsic parameters. The bias point shifts due to hot and cold temperature variations which is due to the Quiescent-point shifting to the upper and lower side of the load line causing clipping and distortion of the waveform. Variation in the temperature and operating conditions in the amplifier for on-board systems results in the degradation of the gain and noise figure. This article details the various parameters of transistor affected by the temperature variation and further shows the practical analogy for the same. Keywords : Transistor, temperature, bias point, stability. http://www.scientiaresearchlibrary.com/archive-abs.php?arc=569http://www.scientiaresearchlibrary.com/archive/JETR-2017-5-3-137-1-7.pdf