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RF power sensing circuit

A technology of radio frequency power and radio frequency voltage, applied in the field of radio frequency transmission, can solve the problems of unable to explain the phase mismatch of RF voltage and insufficient power determination.

Active Publication Date: 2009-12-30
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the determination of the RF voltage also does not account for the phase mismatch between the RF voltage and the RF current
Thus, the resulting power determination is deficient

Method used

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Embodiment Construction

[0050] figure 1 A schematic block diagram of an electronic circuit 100 of the present invention is shown. The electronic circuit 100 is used to measure the output power of an RF power amplifier. The electronic circuit 100 has a detection module 120 , a coherent detector module 110 , a low-pass filter 112 , two current mirrors 114 , 115 , a logarithmic converter 116 , an amplifier 118 , and an output 130 . The sense module 120 has a current sense transistor 104 and a DC offset transistor 106 . The components of the detection module 120 are used to detect and extract the RF current and DC offset of the RF power amplifier 102 . The RF power amplifier 102 is preferably an RF transistor with its base serving as the input to the power amplifier. The collector of RF transistor 102 is preferably connected to output 103 of a power amplifier for coupling the amplified signal to a load.

[0051] Components 104 and 106 of detection module 120 are coupled to RF transistor 102 by differ...

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Abstract

The present invention provides an electronic circuit for measuring of an output power of a RF power amplifier. The electronic circuit comprises a current sensing transistor for sensing the RF current of the power amplifier and a voltage sensing module for sensing the voltage of the RF power amplifier. The electronic circuit further comprises a coherent detector for multiplying the sensed current and the sensed voltage in the time domain. In this way a signal is generated that is directly indicative of the power provided by the power amplifier irrespective of its actual load. Preferably, the coherent detector is implemented as a Gilbert quad and provides a differential output that effectively allows for DC offset compensation.

Description

technical field [0001] The present invention relates to the field of radio frequency transmission, and in particular is not limited to the power detection of radio frequency power amplifiers. Background technique [0002] Wireless communication systems are generally based on the transmission of radio frequency (RF) signals. Mobile stations, such as mobile cellular telephones, must provide sufficient RF signal amplification to ensure reliable communication links with telecommunication components of the mobile telecommunications network, such as mobile nodes. Typically, mobile stations feature circuitry that detects the RF power delivered by the mobile station's power amplifier. The determination of RF power is important for the control of RF power amplifiers. The load coupled with the RF amplifier may fluctuate strongly, which may have a severe impact on the work of the amplifier. For example, the loading variation of the RF power amplifier may result from the interaction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G3/30G01R21/06H04B7/005
CPCH03F3/45744H03F2200/462H03G3/3042H03F3/45968H03F2200/465H03F2200/471H04W52/52
Inventor 翁诺·M·库依杰肯
Owner NXP BV