Such variations are found that due to applied magnetic field from the substrate . the aspect and brightness of the glow and the self - bias voltage for the target changes significantly . further measurements for the deposited films indicate that the appearance and the deposition rate of the films also vary
12.
The traditional bandgap reference circuit was improved in the design , which includes the applying of self - bias structure and cascode structure , output of the opamp was used as self - bias voltage , saving bias circuit , and then it was helpful to get low power consumption . through using poly resistance of high value with low temperature coefficient , we reduced the influnce to circuit , if power supply did not change , we must decrease operating current to decrease power consumption , and increasing value of resistor could decrease the operating current efficiently . poly resistance of high value had large value of squared resistor , so we could save layout area
