Devices and methods for radio-frequency voltage detection
a technology of voltage detection and devices, applied in the direction of transmission, instrumentation, transmission, etc., can solve the problem that the practical implementation of this approach does not provide an exact measurement of the voltage level of the input signal
Inactive Publication Date: 2020-05-21
SKYWORKS SOLUTIONS INC
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AI Technical Summary
Benefits of technology
The present patent is for a circuit that uses a sigmoid function to improve the output of a detector. The detector produces a signal that is then corrected using the sigmoid function. This helps to make the detector better and more accurate. The sigmoid function is a mathematical function that has an S-shape, which can be easily obtained in some electronic circuits. It is used in detectors to make them work better and more efficiently.
Problems solved by technology
As the derived error term is only an approximation to the true error in a detector, practical implementations of this approach do not provide an exact measurement of the voltage level of the input signal, particularly for low voltage levels, having a non-linear response to the voltage level of the input signal.
Method used
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Embodiment Construction
[0051]Although described in the present disclosure with particular reference to detecting the output of a power amplifier, detectors according to the present disclosure can be implemented in any system where it is desirable to use a peak detector for measuring a peak voltage of a signal. While detectors embodying aspects of the present disclosure find particular application for detecting RF input signals, such detectors may be used to detect the peak voltage of a lower frequency signal.
[0052]FIG. 1 is a schematic diagram of a circuit according to Meyer's approach and comprises two bipolar NPN transistors QA and QB. Collector terminals of QA and QB are connected directly to a supply voltage at Vcc. The base of QB is connected to Vcc via resistor RB and the base of QA is also connected to Vcc via resistor RA. The emitter of QA is connected to ground via, in parallel, current source IA and capacitor CA. The emitter of QB is connected to ground via, in parallel, current source IA and ca...
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Methods and apparatus are provided for detection of voltage levels of RF signals. A first voltage correction is provided based on a thermal voltage and a second voltage correction is provided based on a voltage difference between a detection transistor, used for the rectification of the RF signal, and a reference transistor, to which the RF signal is not supplied. Based on the first and second voltage corrections, a more accurate detector with greater linearity may be obtained. In an embodiment, the second voltage correction may be generated proportional to a hyperbolic tangent of the voltage difference between two transistors, obtained using an additional pair of transistors configured as a differential pair. Applications include the control of a power amplifier output in a wireless device.
Description
CROSS-REFERENCE TO RELATED APPLICATION(S)[0001]This application is a continuation of U.S. patent application Ser. No. 15 / 207,485, filed Jul. 11, 2016, entitled “RADIO-FREQUENCY VOLTAGE DETECTION,” which claims priority to U.S. Provisional Application No. 62 / 191,473, filed Jul. 12, 2015, entitled “RADIO-FREQUENCY VOLTAGE DETECTION,” the disclosure of which is hereby expressly incorporated by reference herein in its entirety.BACKGROUNDField[0002]The present disclosure relates to detectors of radio-frequency (RF) signals.Description of the Related Art[0003]In many radio-frequency (RF) applications it is advantageous to be able to detect the power level of a signal. An approach is to detect the envelope of a signal or its peak voltage.[0004]For example, in some applications it is desirable to know the voltage level of a signal outputted from a power amplifier (PA) to provide feedback for controlling the outputted signal level. This may be incorporated into automatic gain control, wherei...
Claims
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IPC IPC(8): G01R19/04G01R19/32
CPCG01R19/04G01R19/32G01R21/14H04B17/318
InventorWHITTAKER, EDWARD JOHN WEMYSS
OwnerSKYWORKS SOLUTIONS INC