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  • 1
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    Correcting For Capacitance In Tests Of Solar Cells (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Modified procedure for testing solar photovoltaic cells and modified software for processing test data provide corrections for effects of cell capacitance. Procedure and software needed because (a) some photovoltaic devices (for example, silicon solar cells with back-surface field region) store minority charge carriers in cell junction and thus exhibit significant capacitance, (b) capacitance affects current-vs.-voltage (I-V) measurements made when transient load connected to cell, and (c) transient load used in unmodified version of test procedure. Corrected I-V curve obtained in test of solar cell according to modified procedure approximates true cell voltage vs. cell current more closely.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-19516 , NASA Tech Briefs (ISSN 0145-319X); 19; 10; P. 14a
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Wideband Linear Phase Modulator (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Phase modulator for transmission in X band provides large phase deviation that remains nearly linear with voltage over relatively wide range. Operates with low loss over wide frequency band and with stable characteristics over wide temperature range. Phase modulator contains two varactor-diode phase shifters coupled via circulators. Separate drive circuit applies modulating voltages to varactor diodes. Modulation voltages vary in accordance with input to drive circuit.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-18602 , NASA Tech Briefs (ISSN 0145-319X); 18; 4; P. 44
    Format: text
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    NASA TECHNICAL REPORTS
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