Low offset envelope detector and method of use
First Claim
1. 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.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
20 Claims
-
1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. 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. - View Dependent Claims (10, 11, 12, 13, 14)
-
-
15. 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. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification