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Low and intermediate frequency wireless receiver with calibrating circuit

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

Inactive Publication Date: 2006-07-12
南京紫宸鼎芯微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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Embodiment Construction

[0017] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0018] Such as image 3 As shown, in the present invention, the output of the voltage controlled oscillator is connected to the clock injection terminal of the high-speed frequency divider. Such as Figure 4 As shown, a conventional high-speed divider-by-two consists of a clock injection stage (Q 1 -Q 2 ), quadrature oscillator stage (Q 3 -Q 6 ), load level (R 1 -R 4 ) and a bias circuit. Such as Figure 5 As shown, the present invention has a low-IF wireless receiver with a calibration circuit, wherein the high-speed frequency divider has increased two groups of bias current adjustable arrays on the traditional high-speed frequency divider, which are respectively located at the clock injection pole (Q 1 , Q 2 ) between the base and the DC voltage source, the two bias current adjustable arrays are composed of n...

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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 invention relates to a wireless communication receiving device, in particular to a low intermediate frequency wireless receiver. Background technique [0002] With the advancement of technology level and the improvement of system integration requirements, the low-IF receiver ( figure 1 ) research and design more and more. The low-IF receiver converts the RF signal to a low-IF and then to baseband, which not only overcomes the DC interference problem of the zero-IF receiver, but also reduces the quality factor requirements of the filter at low IF, so that the filter can be implemented on-chip and overcomes the The shortcomings of low integration of traditional receivers are eliminated. [0003] The biggest defect of the low-IF receiver is the low interference rejection of the image frequency. The image frequency interference and the radio frequency signal are centered symmetrically with the local oscillator frequency on the spectrum, and the diff...

Claims

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Application Information

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Patent Type & Authority Applications(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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