| 摘要 |
Amplifier of electric signals of extremely low amplitudes and/or electric signals contained in environment considerably filled with noise is electronic device that in the basic performance has fixed differencial amplification, that equals Ad = 1 + R1/R2 = 1 + R4/R3 while the amplifing of a signal of medium value minimizes by adjusting ballance of resistance bridge R1-R2=R3-R4 and in the most simple way, by changing one from that four resistance. The entrance resistance of amplifier is very high and restricted by entrance resistance of used operational amplifiers. New construction of amplifier enables great simplification of the very process of production of this type of amplifier, with the very fact that it is not necessary any more to take highly coupled resistances, and neither operational resistances made as dual operational resistances, as well as the number of components, in comparison to instrumental amplifier mentined in the state of art, considerably reduced. |
