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The IUP Journal of Electrical and Electronics Engineering:
A Study on CMOS Noise and Noise Reduction Techniques
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Noise reduction is important whenever the amplitudes of the processed signals are similar to those of the existing noise and noise considerations become very important in low frequency analog circuit design. Today’s analog designers constantly deal with the problem of noise because it trades with power dissipation, speed and linearity. The paper presents the types of CMOS noises and their modeling. The most important noise in today’s consideration is flicker noise because it increases at low frequencies so it is discussed in detail with the thermal noise. The techniques presented in this paper are for mainly reduction of intrinsic noises. Noise cannot be removed completely but we can only minimize the noise for a particular level such that it effects less than that of normal operation. Proper understanding of noise reduction techniques is important for analog designer to design an analog circuit for optimized performance.

 
 

From a historic point of view, people working in the field of analog circuits were the first to be concerned with the noise problem. Since 1955, Van der Ziel noted that from a conceptual standpoint, the term, “spontaneous fluctuation” is more appropriate than “noise”. Later, Rheinfelder (1964), followed by Hartmann (1976), proposed definitions similar to that given by IEEE. They pointed out that “unwanted signal” means a signal which does not convey useful information. In 1966, Chenette elaborated on the definition on noise by insisting on the fact that the “unwanted disturbances” must be described in terms of their statistical properties.

 
 
 

Electrical and Electronics Engineering Journal, CMOS noise, Thermal noise, Flicker noise, Modeling of CMOS noise, Noise reduction techniques