RF DETECTOR WITH CREST FACTOR MEASUREMENT
First Claim
1. A power detector comprising:
- an input configured to receive an input signal;
a variable gain detection subsystem including at least one detector coupled to the input and which detects the input signal and provides a detector output signal;
an integrator coupled to the variable gain detection subsystem and configured to receive the detector output signal and a reference signal and to provide an integrator output signal which is representative of an average power level of the input signal; and
an instantaneous power processing device coupled to the variable gain detection subsystem and configured to receive the detector output signal and to provide at an output of the power detector an instantaneous power output signal which is representative of the instantaneous power level of the input signal normalized to the average power level of the input signal;
wherein the variable gain detection subsystem is configured to receive the integrator output signal and to adjust the detector output signal to a level approximately that of the reference signal.
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Accused Products
Abstract
An RF detector configured to provide two outputs, one being a function of the true RMS power level of an RF input signal, and the other being a function of the instantaneous/peak power of the RF input signal, normalized to the average power level. The RF detector includes a variable gain detection subsystem including a single detector or detector array that provides a representation of the power level of the RF input signal. The detector or detector array is common to both the RMS power detection channel and the instantaneous/peak power detection channel of the RF detector. A method of RF detection includes providing representations of the RF input signal at different gain levels, selecting one or more of the representations, and averaging the selected signals. The gain levels of the selected representations is adjusted to provide information about the average power level of the RF input signal.
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Citations
18 Claims
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1. A power detector comprising:
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an input configured to receive an input signal; a variable gain detection subsystem including at least one detector coupled to the input and which detects the input signal and provides a detector output signal; an integrator coupled to the variable gain detection subsystem and configured to receive the detector output signal and a reference signal and to provide an integrator output signal which is representative of an average power level of the input signal; and an instantaneous power processing device coupled to the variable gain detection subsystem and configured to receive the detector output signal and to provide at an output of the power detector an instantaneous power output signal which is representative of the instantaneous power level of the input signal normalized to the average power level of the input signal; wherein the variable gain detection subsystem is configured to receive the integrator output signal and to adjust the detector output signal to a level approximately that of the reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power detector comprising:
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an input configured to receive an input signal; a variable gain detection subsystem including only one squaring detector coupled to the input and which detects the input signal and provides a detector output signal; an integrator coupled to the variable gain detection subsystem and configured to receive the detector output signal and a reference signal and to provide an integrator output signal which is representative of an average power level of the input signal; and an instantaneous power processing device coupled to the variable gain detection subsystem and configured to receive the detector output signal and to provide at an output of the power detector an instantaneous power output signal which is representative of the instantaneous power level of the input signal normalized to the average power level of the input signal; wherein the variable gain detection subsystem further includes a bias control circuit coupled between the integrator and the squaring detector, the bias control circuit being configured to receive the integrator output signal and to provide a detector gain control signal to the squaring detector; and wherein the variable gain detection subsystem is further configured to control a scaling factor of the squaring detector based on the integrator output signal to adjust the detector output signal to a level approximately that of the reference signal.
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14. A method of power detection comprising:
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receiving an input signal at an input of a detector; detecting with the detector a power level of the input signal to provide a detected signal; subtracting from the detected signal a signal not related to the input signal to reduce effects of temperature and fabrication process variations at an output of the detector and to provide an output signal; comparing the output signal with a reference signal to provide an error signal; integrating the error signal to provide an integrated signal which is representative of an average power level of the input signal; providing an instantaneous power output signal responsive to the output signal, the instantaneous power output signal being representative of the instantaneous power level of the input signal normalized to the average power level of the input signal; and adjusting the output signal to a level approximately that of the reference signal. - View Dependent Claims (15, 16, 17, 18)
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Specification