Orthogonal mismatch calibration method and device of direct frequency conversion transmitter

A technology for quadrature mismatch and calibration devices, applied in transmitter monitoring, transmission monitoring, electrical components, etc., can solve the problems of many components, large power consumption, and large amount of calculation

Active Publication Date: 2013-12-18
GUANGZHOU RUNXIN INFORMATION TECH
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  • Abstract
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Problems solved by technology

[0009] The purpose of the present invention is to propose a method and device for calibrating quadrature mismatch of a direct conversion tra

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  • Orthogonal mismatch calibration method and device of direct frequency conversion transmitter
  • Orthogonal mismatch calibration method and device of direct frequency conversion transmitter
  • Orthogonal mismatch calibration method and device of direct frequency conversion transmitter

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Embodiment Construction

[0050] Hereinafter, the present invention will be further described with reference to the accompanying drawings and specific embodiments.

[0051] like Figure 3 to Figure 11 As shown in the figure, a quadrature mismatch calibration device of a direct conversion transmitter, which is applied to such as figure 1In the shown direct-conversion transmitter, the direct-conversion transmitter includes a baseband signal in-phase channel, a baseband signal quadrature channel, a passive mixer 107 with a duty cycle of 25% local oscillator, a frequency synthesizer 104, a divide-by-two Frequency divider 105, 25% duty cycle local oscillator generator 106, variable gain power amplifier 109 and antenna 118, the baseband signal in-phase channel includes a first digital-to-analog converter 101I and a first reconstruction low-pass filter 102I , the baseband signal quadrature channel includes a second digital-to-analog converter 101Q and a second reconstruction low-pass filter 102Q.

[0052] T...

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Abstract

The invention relates to an orthogonal mismatch calibration method and device of a direct frequency conversion transmitter. The orthogonal mismatch calibration device comprises a first voltage comparator, a second voltage comparator, a first switching circuit, a second switching circuit, a digital state machine, a low-pass filter, a gain fine-tuning circuit and a phase fine-tuning circuit. The output end of a passive frequency mixer is connected with the input end of the low-pass filter, and the output end of the low-pass filter is connected with a first input end of the second voltage comparator. The gain error and the phase error between same-phase/orthogonal channels of the direct frequency conversion transmitter are measured with the orthogonal mismatch calibration method and device; the optimal calibration value is obtained through successive approximation, the self-calibration capacity of orthogonal mismatch of the direct frequency conversion transmitter can be improved, and dependency, complexity and power consumption of a calibration system are lowered.

Description

technical field [0001] The present invention relates to a method and device for calibrating quadrature mismatch of a direct frequency conversion transmitter. Background technique [0002] Among wireless communication transmitters, direct-conversion transmitters are widely used in the field of radio frequency integrated circuits because of their simple circuit structure and easy integration. Direct-conversion transmitters using passive mixers with a duty cycle of 25% local oscillator have gradually become mainstream technologies due to their high linearity, low noise, and low power consumption. However, the quadrature mismatch problem of the direct-conversion transmit architecture has always been one of its main drawbacks. The quality of the transmitted signal is degraded due to the image interference of the transmitted signal caused by the mismatch. Direct conversion transmitters must be calibrated for quadrature mismatch. [0003] exist figure 1 and figure 2 The typic...

Claims

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Application Information

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IPC IPC(8): H04B1/04H04L27/36H04B17/00H04B17/11
Inventor 张伟锋石磊
Owner GUANGZHOU RUNXIN INFORMATION TECH
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