Fine gain tuning
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United States of America Patent
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Feb 24, 2015
Grant Date -
Jun 7, 2012
app pub date -
Jul 16, 2010
filing date -
Jul 31, 2009
priority date (Note) -
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Abstract
A circuit tuneable between first and second frequencies comprising gain control circuitry operable to control the gain of the circuit between the first and second frequencies, the gain control circuitry comprising a resistor network having: at least two resistor lines arranged in parallel, each resistor line comprising one or more resistors; and for each resistor line, a switch operable to select or deselect the corresponding resistor line; the resistor lines and switches being arranged such that the net resistance of the resistor network is the parallel sum of each of the selected resistor lines; and logic circuitry configured to control said switches so as to minimize the variation in gain of the circuit between the first and second frequencies.
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