Browsing by Author "Ryan, RD"

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    Cooled preamplifiers with diode current leak
    (Australian Atomic Energy Commission, 1970-09) Ryan, RD
    A high resolution voltage sensitive cooled preamplifier for semiconductor radiation detectors has been operated with a Schottky barrier diode as the current leak. A resolution of less than 300 eV (fwhm Si) was realised.
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    Cooled preamplifiers with N- or P-silicon JFET's
    (Australian Atomic Energy Commission, 1970-09) Ryan, RD
    A voltage sensitive cooled preamplifier has been operated with comparable resolution from n- and p-Si junction field effect transistor's (JFET's). To obtain optimum JFET operating conditions it is necessary to consider in detail the inter-related parameters of device thermal resistance, the variation of JFET noise with temperature and of gate current with drain voltage. Measurement and optimisation procedures are described.