Local oscillator leakage automatic eliminator

A local oscillator leakage, automatic technology, applied in the direction of automatic power control, electrical components, transmission systems, etc., can solve the problems of communication interruption, communication interference, high bit error rate, etc., to achieve the effect of improving the effective power

Inactive Publication Date: 2008-04-16
BEIJING LHWT MICROELECTRONICS
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, due to the inherent mismatch and DC offset characteristics of the circuit, the main disadvantage of the zero-IF transmitter is the leakage of the local oscillator signal, and according to the wireless communication protocol (such as the protocol of IEEE802.11 WLAN), the large local oscillator leakage will affect the The performance of the entire communication system has a great impact, such as high bit error rate, communication interruption and communication interference, etc.

Method used

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Embodiment Construction

[0040] The specific implementation process of the present invention will be further described below in conjunction with the accompanying drawings:

[0041] 1. The structure of CMOS wireless radio frequency transceiver

[0042] 1. Transceiver

[0043] Such as figure 1 As shown, the CMOS wireless RF transceiver integrates a low-noise amplifier (LNA), an I / Q down-conversion mixer (mixer), an integrated phase-locked loop-based frequency synthesizer (synthesizer) (the frequency synthesizer can generate Orthogonal local oscillator signal) and baseband analog processing circuit, the baseband analog processing circuit includes a variable gain amplifier (VGA) and a low-pass filter (LPF). The signal processed by the baseband analog processing circuit reaches the analog-to-digital converter (ADC), and the output of the analog-to-digital converter is input to the baseband processor (BB). After the baseband processing, the received signal can be demodulated.

[0044] In the transmitter...

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Abstract

The invention discloses a local-oscillation leakage automatic removing device, comprising a coupling capacitance used to test the local-oscillation leakage signal, an amplifier used to amplify the detected local-oscillation leakage signal, a high-frequency peak detector used for demodulation of the amplified signal and output DC signal, a programmable lag comparator used to compare the DC signal and reference signal after demodulation. According to the result of comparison, the control signal is exported to control the programmable current source to export compensation signals to remove local-oscillation leakage, and at the same time, control the digital signal processing module of the programmable lag comparator to change the size of he lag window. The invention is capable to remove the local-oscillation leakage in a CMOS wireless radio-frequency transceiver, and improve the effective power of signals.

Description

technical field [0001] The invention relates to a wireless communication transceiver, in particular to a device for automatically eliminating local oscillator leakage in a CMOS wireless radio frequency transceiver. Background technique [0002] Recently, wireless local area network (WLAN, Wireless Local Area Network) systems have been widely used in homes and offices. The wireless local area network system based on IEEE 802.11b / g standard can provide the data rate from 1Mbps to 54Mbps in the frequency band of 2.4GHz. Low-cost and high-performance radio frequency transceivers are key components in the popularity of WLANs. On the other hand, RF CMOS has become the dominant IC process for non-cellular wireless applications, such as applications in Bluetooth, Global Positioning System (GPS, Global Positioning System) and wireless local area networks. [0003] CMOS wireless radio frequency transceivers are mainly used in low-cost wireless local area networks. In order to achie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/38H03L7/085H04B1/40
Inventor 王海永吴南健寿国梁
Owner BEIJING LHWT MICROELECTRONICS
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