MONOLITHIC JFET PREAMPLIFIER WITH NONRESISTIVE CHARGE RESET

This paper shows how a monolithic JFET preamplifier for spectrometry a pplications can be upgraded by introducing a nonresistive reset, It wa s found that the charge reset which employs a forward-biased gate-to-s ource junction of the input JFET suits this case best. The introductio n of the nonresistive feedback is important in two respects. First, it puts into better evidence the intrinsic noise limitations of the mono lithic preamplifier, Second, it opens up a new perspective in the desi gn of monolithic preamplifiers for very high-resolution X-ray applicat ions.