Method for eliminating mirror image interference in low-intermediate frequency receiver and relevant apparatus

A low-IF receiver and mixer technology, applied to electrical components, transmission systems, etc., can solve problems such as easy completion and energy consumption

Inactive Publication Date: 2004-08-25
MEDIATEK INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the common patent that mainly uses digital methods to correct the mismatch of a pair of quadrature signals to eliminate mirror images, Glas et al., in US Patent 6,330,290, "Digital I/Q imbalance compensation", proposed the use of test signals (Test Signal) and The compensation (Compensation) mechanism corrects the phase (Phase) and amplitude (Amplitude) of a pair of quadrature signals in a digitally controlled manner, and the correction method is to multiply a pair of quadrature signals by a complex preset value The purpose of image elimination is achieved by fine-tuning...

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  • Method for eliminating mirror image interference in low-intermediate frequency receiver and relevant apparatus
  • Method for eliminating mirror image interference in low-intermediate frequency receiver and relevant apparatus
  • Method for eliminating mirror image interference in low-intermediate frequency receiver and relevant apparatus

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Embodiment Construction

[0022] refer to figure 2 , figure 2 is a schematic diagram of one embodiment of a low-IF receiver 30 according to the present invention. Low intermediate frequency receiver 30 comprises: additional filter 32, low noise amplifier (Low NoiseAmplifier, LNA) 34, mixer (Mixer) 36, programmable amplitude adjuster 44,46 (the first programmable amplitude adjuster 44 and the second Two programmable amplitude regulator 46), programmable phase regulator 48, complex filter 38, and analog-to-digital converter (Analog-to-digital Converter, ADC) 40, wherein, will figure 2 with descriptions of common techniques figure 1 After comparison, it can be seen that figure 2 The additional filter 32, low-noise amplifier 34, mixer 36, complex filter 38, and analog-to-digital converter 40 and other components and basic structures in the embodiment are similar to the common low-IF receiver 30, wherein the low-IF receiver The machine 30 also includes a frequency synthesizer 50, which is used to pr...

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Abstract

This invention provides a method for eliminating an amplitude mismatch and a phase mismatch in a pair of quadrature signals to eliminate image interference, in which, the said pair of quadrature signals includes an in-phase signal and a quadrature-phase signal. The said method includes compensating part of the in-phase signals into the quadrature-phase signals to make the compensated phase differ from the phase of in-phase signal by 90 deg. to eliminate phase difference of the pair and regulate the amplitude of the in-phase signal and the quadrature phase signal to a same value to eliminate its amplitude difference.

Description

technical field [0001] The present invention provides a novel image interference analysis and correction method, especially a method for eliminating the amplitude difference (Amplitude Mismatch) and phase difference (Phase Mismatch) in a pair of quadrature signals (Quadrature Signal), so as to eliminate Image interference in low-IF receivers. Background technique [0002] In the radio frequency transmission structure of the current wireless communication system, there are currently two types of receiver structures that can achieve high integration and multi-mode, one is a low intermediate frequency (Low IF) receiver, and the other is a direct conversion (Direct Conversion) receiver. ), or called zero intermediate frequency (Zero IF) receiver, both have advantages and disadvantages, and both have been widely valued and applied in the industry. The former can avoid the problems of DC offset and low-frequency noise, but it will be interfered by the image signal (Image Signal)....

Claims

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Application Information

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IPC IPC(8): H04B1/10
Inventor 汪重光林建志
Owner MEDIATEK INC
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