Abstract
Experimental investigation of the developed eye tumors diagnostic system has revealed the tasks of system improvement, like reduction of the noise level of the preamplifier. The reliable solution is selection of analogue components of the preamplifier possessing as low noise level as available in the market of electronic components supply. Simultaneously, well known techniques of noise reduction should be used during the process design also. This paper discuses the design and development of the ultra-low noise preamplifier for medical applications. For the preamplifier schematic the principle of low frequency amplification with reduced the amplifier noise by n , where n is the number of amplifiers, is proposed. Using the final design of the preamplifier the noise factor value of 0.46 dB with gain of 48 dB and bandwidth of 2-35 MHz has been achieved.
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