Low offset envelope detector and method of use
First Claim
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1. A system for processing a signal comprising:
- a differential amplifier receiving a radio-frequency input signal at a first differential input;
a non-linear 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;
amplification circuitry, coupled to the output of the differential amplifier and the control terminal of the non-linear rectifying device, having higher gain at radio frequency than at low frequency; and
wherein the second differential input of the differential amplifier receives a low frequency feedback signal from the output of the rectifying device.
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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.
143 Citations
20 Claims
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1. A system for processing a signal comprising:
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a differential amplifier receiving a radio-frequency input signal at a first differential input; a non-linear 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; amplification circuitry, coupled to the output of the differential amplifier and the control terminal of the non-linear rectifying device, having higher gain at radio frequency than at low frequency; and 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)
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9. A method for processing a signal comprising:
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generating an output based on the difference between a radio frequency input and a low frequency feedback input; amplifying the output with an amplifier circuit having higher stain at radio frequency than at low frequency; controlling a control terminal of a rectifying device using the amplified 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)
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15. A system for processing a signal comprising:
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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 amplifying the output with an amplifier circuit having higher gain at radio frequency than at low frequency; means for receiving the amplified 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)
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Specification