Low and intermediate frequency wireless receiver with calibrating circuit

A wireless receiver and calibration circuit technology, applied to electrical components, transmission systems, etc., can solve the problems of quadrature interference amplitude and phase mismatch, image frequency interference signal cannot be completely offset, etc., to improve the suppression of image frequency interference Effect

Inactive Publication Date: 2009-03-25
南京紫宸鼎芯微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the asymmetry of the circuit and layout and the error of the process will lead to the mismatch of the amplitude and phase of the quadrature interference output by the mixer, so that the image frequency interference signal cannot be completely offset

Method used

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  • Low and intermediate frequency wireless receiver with calibrating circuit
  • Low and intermediate frequency wireless receiver with calibrating circuit
  • Low and intermediate frequency wireless receiver with calibrating circuit

Examples

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Embodiment Construction

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Such as image 3 As shown, in the present invention, the output of the voltage controlled oscillator is connected to the clock injection end of the high speed divider. Such as Figure 4 As shown, the traditional high-speed diogram is injected from the clock (Q 1 -Q 2 ), Orthogonal oscillation level (Q 3 -Q 6 ), Load level (R 3 -R 6 ) And bias circuits. Such as Figure 5 As shown, the present invention has a low intermediate wireless receiver of the calibration circuit, wherein the high-speed divider adds two sets of bias current adjustable array on a conventional high-speed frequency divider, located in the clock injection pole (Q). 1 , Q 2 Between the base and DC voltage sources, the two-bias current adjustable array is composed of N (n ≥ 1) strip-switched current source, and fine-tune Q by controlling switch 1 , Q 2 The bias voltage changes the duty cycle of the quadrature output orthogonal vibration, thereby chan...

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Abstract

The invention discloses a low-intermediate frequency wireless receiver with calibration circuit, which comprises: a high-speed frequency divider with an added differential offset current tunable array to change local oscillator duty ratio by fine tuning offset current and realize coarse tuning for image frequency interference phase, and a frequency mixer with a resistive load tunable array to eliminate amplitude mismatch as image frequency interference and a switch capacity load tunable array to realize fine tuning for image frequency interference phase. This invention improves the mismatch from asymmetry and technology error and suppression function to interference.

Description

Technical field [0001] The present invention relates to a wireless communication receiving apparatus, and more particularly to a low intermediate frequency wireless receiver. Background technique [0002] With the advancement of process levels and the improvement of system integration requirements, low-frequency receivers ( figure 1 The research and more and more design is more. The low tall-frequency receiver converts the RF signal to the low intermediate frequency, converted to the baseband, but not only overcomes the DC interference problem of zero intermediate frequency receiver, but the low intermediate frequency to reduce the quality factor of the filter, so that the filter can be implemented, but also overcome The shortcomings of traditional receiver integration. [0003] The maximum deficiencies of low tall-frequency receivers are low in mirror interference. The mirror interference with the radio frequency signal in the spectrum with the intermediate frequency frequency ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10H04B1/16
Inventor 谢婷婷张钊锋倪文海
Owner 南京紫宸鼎芯微电子有限公司
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