Adaptable voltage control for a variable gain amplifier
AssigneeBroadcom Corporation
InventorsMario Caresosa, Guangming Yin
Life of this patent
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Abstract
A method and apparatus for adaptively controlling a variable gain amplifier (VGA). The operation of the VGA is separated into a low gain mode and a high gain mode and the mode in which the VGA is currently operating in is adaptively sensed. A threshold voltage is compared to a control voltage of the VGA; if the VGA is currently operating in the low gain mode and the control voltage is higher than the threshold voltage, the VGA is switched from the low gain mode to the high gain mode; and if the VGA is currently operating in the high gain mode and the control voltage is lower than the threshold voltage, the VGA is switched from the high gain mode to the low gain mode.
Claims25
A method for adaptively controlling a variable gain amplifier (VGA), the method comprising:
- separating the operation of the VGA into a low gain mode and a high gain mode;
- adaptively sensing which mode the VGA is currently operating in;
- comparing a threshold voltage to a control voltage of the VGA;
- if the VGA is currently operating in the low gain mode and the control voltage is higher than the threshold voltage, switching the VGA from the low gain mode to the high gain mode;
- and
- if the VGA is currently operating in the high gain mode and the control voltage is lower than the threshold voltage, switching the VGA from the high gain mode to the low gain mode.
An apparatus for adaptively controlling a variable gain amplifier (VGA) having a low gain mode of operation and a high gain mode of operation, comprising:
- a circuit for adaptively sensing which mode the VGA is currently operating in;
- a comparator for comparing a threshold voltage to a control voltage of the VGA;
- and
- a control logic for switching the VGA from the low gain mode to the high gain mode if the VGA is currently operating in the low gain mode and the control voltage is higher than the threshold voltage, and for switching the VGA from the high gain mode to the low gain mode if the VGA is currently operating in the high gain mode and the control voltage is lower than the threshold voltage.
An electronic circuit for adaptively controlling a variable gain amplifier (VGA) having a low gain mode of operation and a high gain mode of operation, comprising:
- means for adaptively sensing which mode the VGA is currently operating in;
- means for comparing a threshold voltage to a control voltage of the VGA;
- means for switching the VGA from the low gain mode to the high gain mode if the VGA is currently operating in the low gain mode and the control voltage is higher than the threshold voltage;
- and
- means for switching the VGA from the high gain mode to the low gain mode if the VGA is currently operating in the high gain mode and the control voltage is lower than the threshold voltage.
Dependencies are inferred from the claim text.