Method and apparatus for changing the gain of a radio frequency signal
AssigneeMaxlinear Asia Singapore PTE LTD
InventorsPaulius Mosinskis, Omkar Joshi
Life of this patent
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Abstract
A method and electronic circuit for changing the gain of a radio frequency signal. The apparatus is an electronic circuit comprising one or more variable gain electronic elements, and one or more adjustable phase shifting elements. The method comprises the steps of receiving a radio frequency signal, varying the gain of the variable gain electronic element while the variable gain electronic element changes the amplitude of the radio frequency signal, and adjusting an adjustable phase shifting element to generate a reverse phase shift in the radio frequency signal in response to the associated phase shift from the step of varying the gain.
Claims20
An electronic circuit comprising:
- a variable gain amplifier (VGA), wherein the VGA is operable to introduce an unwanted phase shift in an analog radio frequency (RF) signal, the unwanted phase shift being dependent on a gain of the VGA;
- and
- a phase shifter operably coupled to the VGA, wherein the phase shifter is operable to introduce a phase shift in an analog RF signal, the phase shift being dependent on a capacitance of the phase shifter, the capacitance of the phase shifter being initially set to a maximum level, thereafter, the capacitance of the phase shifter being reduced to offset the unwanted phase shift.
A system comprising:
- a variable gain amplifier (VGA), wherein the VGA is operable to introduce an unwanted phase shift in an analog radio frequency (RF) signal, the unwanted phase shift being dependent on a gain of the VGA, the gain of the VGA being controlled by a resistive circuit;
- and
- a phase shifter operably coupled to the VGA, wherein the phase shifter is operable to introduce a phase shift in an analog RF signal, the phase shift being dependent on a capacitance of the phase shifter, the capacitance of the phase shifter being initially set to a maximum level, thereafter, the capacitance of the phase shifter being reduced to offset the unwanted phase shift.
Dependencies are inferred from the claim text.