789 research outputs found
Existence of positive decaying solutions for nonlinear singular second order equations
No full textWe study a singular boundary value problem for a second order equations under quite general assumptions. The conditions guaranteeing its solvability are given, which yield some of the existing results when the equation reduces to special forms
Performance of an X-ray spectroscopic system based on a double-gate double-feedback charge preamplifier
No full text
Double particle resolution in semiconductor drift detectors
No full textThe optimum signal processing of two close pulses produced by ionization of two close fast particles in a semiconductor drift detector is presented. The optimum is relative to the determination of charges produced by each particle and the average drift times for the released charges to reach the anode. The resolution of the charge and the drift time measurements in the presence of additive and nonadditive noises have been theoretically studied as functions of the distance between two fast ionizing particles and the amount of ionization produced by individual particles. Is it shown that the precision of the position determination of the individual particles remains good enough also in the case of a significant overlap of the two pulse
Novel p-JFET embedded in silicon radiation detectors that avoids preamplifier feedback resistor
No full textLow noise charge sensitive preamplifier dc stabilized without a physical resistor
No full textThe invention is a novel charge sensitive preamplifier (SCP) which has no resistor in parallel with the feedback capacitor. No resetting circuit is required to discharge the feedback capacitor. The DC stabilization of the preamplifier is obtained by means of a second feedback loop between the preamplifier output and the common base transistor of the input cascode. The input transistor of the preamplifier is a JFET with the gate-source junction forward biased. The detector leakage current flows into this junction. In particular, this invention, in addition to eliminating the feedback resistor, eliminates the need for external devices between the detector and the preamplifier, and it eliminates the need for external circuitry to sense the output voltage and reset the CSP. Furthermore, the noise level of the novel CSP is very low, comparable with the performance achievable with other more complex solutions
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