Device for neutralizing a signal obtained by modulating, on to a high frequency carrier, a useful signal delivered by a system
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United States of America Patent
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Mar 11, 2014
Grant Date -
Dec 13, 2012
app pub date -
Jun 7, 2012
filing date -
Jun 10, 2011
priority date (Note) -
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Abstract
The invention relates to a device for neutralizing a signal obtained by modulating, on to a high frequency carrier, a useful signal delivered by a system comprising a parasitic capacitance Cp that varies over time, the device comprising a neutralizing capacitance Cn, means for providing an adjustable gain G, said means being equipped with a JFET field-effect transistor (J1) equipped with a gate first electrode and drain and source second electrodes, and a control loop for providing gain G so that G×Cn permanently equals Cp by controlling the voltage on the gate first electrode of the transistor (J1). The neutralizing capacitance Cn comprises a first capacitor Cneutro1 and a second capacitor Cneutro2 placed in parallel at the output of said means for providing gain G.
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