Low offset envelope detector and method of use
AssigneeAxiom Microdevices, Inc.
InventorsIchiro Aoki, Setu Mohta, Morten Damgaard
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Abstract
A system for processing a signal is provided. The system includes a differential amplifier receiving a radio-frequency input signal at a first differential input. A rectifying device such as a transistor has a control terminal that is coupled to an output of the differential amplifier and an output that is coupled to a second differential input of the differential amplifier. The second differential input of the differential amplifier receives a low frequency feedback signal from the output of the rectifying device, such as by damping the frequency response at the output of the rectifying device using a capacitor and a current source coupled to the output of the rectifying device.
Claims20
A system for processing a signal comprising:
- a differential amplifier receiving a radio-frequency input signal at a first differential input;
- a rectifying device having a control terminal coupled to an output of the differential amplifier and an output coupled to a second differential input of the differential amplifier;
- wherein the second differential input of the differential amplifier receives a low frequency feedback signal from the output of the rectifying device.
A method for processing a signal comprising:
- generating an output based on the difference between a radio frequency input and a low frequency feedback input;
- controlling a control terminal of a rectifying device using the differential output;
- and
- utilizing a nonlinearity of the rectifying device to generate the low frequency feedback signal from the output of the rectifying device.
A system for processing a signal comprising:
- means for receiving a radio-frequency input signal and a low frequency feedback signal and generating an output based on the difference between radio frequency input and the low frequency feedback signal;
- means for receiving the output and generating a rectified signal;
- and
- means for receiving the rectified signal and generating the low frequency feedback signal.
Dependencies are inferred from the claim text.