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Feedforward loop circuit synchronous detection device

A synchronous detection and loop technology, applied in the field of electronics and wireless communication, can solve the problems of high test cost and complexity

Inactive Publication Date: 2008-07-09
FUJIAN SUNNADA COMM
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Problems solved by technology

[0012] The main purpose of the present invention is to solve the defects of complexity and high test cost in existing test methods, and provide a simple, effective and low-cost test method, which can not only test whether the feedforward power amplifier loop system is synchronous, but also automatically Calculate the amplitude shift ΔA and phase shift Δφ of the two channels of the feedforward loop, which makes debugging the synchronization of the feedforward power amplifier loop simple and effective, reduces the difficulty of debugging, and has low test cost, which is suitable for debugging in mass production

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  • Feedforward loop circuit synchronous detection device

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Embodiment Construction

[0020] The block diagram of the phase noise signal source is shown in Figure 3. The reference frequency oscillation provides a reference frequency for the phase-locked loop and a reference for the phase-locked loop. The function of the phase-locked loop is to make the loop in a stable state with adjustable oscillation frequency under the action of the reference frequency, so that the voltage-controlled oscillator can stably output a sinusoidal signal, which is output after being modulated by the phase modulator; the noise generator generates a Random noise voltage, which injects the noise voltage into the phase modulator after passing through a band-pass filter, and converts the noise voltage into phase noise through the phase modulator, so that the phase of the sinusoidal signal generated by the phase-locked loop can be changed randomly, increasing the noise voltage increases the phase noise. This method has no limitation on the loop filtering bandwidth of the PLL. In order t...

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Abstract

The invention belongs to the field of electronic and wireless communication technology and relates to a feed-forward loop synchronous detection circuit, which is characterized in that the device comprises a phase noise signal source, a feed-forward loop to be measured and a measurement and analytic calculation circuit; the phase noise signal source is outputted by two circuits through a phase modulator; the feed-forward loop to be measured outputs the phase noise signal to the input terminal of a power divider of the feed-forward loop; the power divider divides the phase noise signal into two portions, which are respectively amplified and delayed and converged at a counteraction position; and the two signal portions are transmitted to the measurement and analytic calculation circuit portion to measurement and analytic processing. The invention has the advantages of simple structure, high efficiency, lowered measurement cost and production cost, simple operation and high efficiency, and is suitable for batch production and debugging of feed-forward amplifier.

Description

technical field [0001] The invention belongs to the technical field of electronics and wireless communication, in particular to a feedforward loop synchronous detection circuit. Background technique [0002] Modern wireless communication is developing rapidly towards the direction of increasing information capacity, improving channel spectrum utilization and improving linearity. This puts forward higher requirements on the frequency bandwidth, linearity and efficiency of the high-frequency power amplifier. Commonly used linearization techniques include: power back-off, predistortion, feedforward, etc. Among them, the feedforward technique, due to its advantages of high calibration accuracy, high stability, and not limited by bandwidth, has become an important method to improve the linearity of wideband signals. main technologies used. [0003] Feedforward technology is to extract the intermodulation distortion signal from the amplified output signal, and then mix it with t...

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Application Information

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IPC IPC(8): G01R31/28H03F1/34
Inventor 李卫校林凯
Owner FUJIAN SUNNADA COMM
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