Monotonic and voltage supply independent automatic gain control amplifier
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United States of America Patent
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Feb 22, 2011
Grant Date -
Apr 24, 2008
app pub date -
Oct 18, 2006
filing date -
Oct 18, 2006
priority date (Note) -
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Abstract
A method and circuit are provided wherein the magnitude of an RF signal provided by RF circuit is used to derive a control set point of the RF circuit via an intermediate controller circuit. This controller circuit having the specific function of providing the actual voltage applied to the control point of the RF circuit, via the use of a charge pump, regulator or combination thereof. In this manner the controller limits the maximum applicable voltage set by the limiting characteristics of the charge pump, voltage regulator, or combination thereof. Such limiting characteristics allow the control of the RF circuit to be stabilized against a variety of external factors such as ambient temperature, battery voltage, circuit aging, amongst other factors in a manner exploiting a minimum of additional electronics thereby providing for such performance enhancements with minimum additional die footprint and power consumption.
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