1 F NOISE IN POLYMER THICK-FILM RESISTORS

1/f noise properties of carbon black/polyesterimide and (carbon black + graphite)/polyesterimide thick-film resistors are studied. In resist ive inks either high-structure carbon black or medium-structure carbon black was used. The influence of the content p of carbon black and gr aphite in resistive inks and curing temperature on sheet resistance R- square and noise intensity C is considered. It is shown that a higher curing temperature causes a decrease in the resistor's volume and infl uences R-square and C indirectly, via changes of the parameter p. It i s then found that an increase in p leads to a simultaneous decrease of sheet resistance R-square and noise intensity C. The relation C simil ar to (R-square)'' is found in this case for all measured resistors. T he values of noise exponent eta are estimated and a comparison with th e noise properties of conventional cermet thick-film resistors is made . It is shown that the noise intensities of carbon black/polyesterimid e resistors are comparable to those of cermet resistors.