PLL loop bandwidth switching circuit and method for wireless communication system

A wireless communication system and loop bandwidth technology, applied in transmission systems, electrical components, automatic control of power, etc., can solve problems such as short pause, large phase noise, and long switching time.

Inactive Publication Date: 2006-09-06
南京紫宸鼎芯微电子有限公司
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  • Abstract
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Problems solved by technology

[0011] The object of the present invention is to provide a phase-locked loop loop bandwidth switching circuit and method for wireless communication systems, to overcome the inability of the two key indicators of switching time and phase noise when the current wireless communicati

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  • PLL loop bandwidth switching circuit and method for wireless communication system
  • PLL loop bandwidth switching circuit and method for wireless communication system
  • PLL loop bandwidth switching circuit and method for wireless communication system

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Embodiment Construction

[0020] The following is based on image 3 with Figure 4 , a preferred embodiment of the present invention is given and described in detail, so that the functions and features of the present invention can be better understood.

[0021] see first image 3 , the PLL loop bandwidth switching method for a wireless communication system of the present invention is to divide the PLL locking process into two stages: fast lock and slow lock. On the premise that the order of the loop filter and the parameters of the components are determined, when the phase-locked loop switches from one channel to another, that is, the switching point in the figure, it enters the fast-lock stage, which uses a large charge pump current , since the loop bandwidth is proportional to the charge pump current, a large loop bandwidth and fast locking speed are obtained, so that the output frequency of the loop quickly reaches the target locking frequency; after the locking time required by the system, it ent...

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Abstract

The present invention relates to a phase locked loop bandwidth switching circuit and method used for wireless communication system. Said circuit includes timer control circuit and trigger circuit, when wireless communication equipment is switched from one channel to another channel, trigger circuit setting charge pump current as heavy current to obtain large loop bandwidth and quick lockout speed, to make loop circuit frequencies of printout rapid reaching target locking frequency, through system required locking time, timer control circuit recovering charge pump current as low current, due to loop bandwidth reducing, outband phase noise changed better, receiving end neighboring trace signal selectivity and transmitting terminal neighboring trace power leakage rejection ratio all relatively changed better.

Description

technical field [0001] The invention relates to a phase-locked loop bandwidth switching circuit and method, in particular to a phase-locked loop bandwidth switching circuit and method in a wireless communication transceiver system adopting seamless switching technology. Background technique [0002] When using a wireless communication device to make a call, the base station needs to transmit the signal. The signal coverage of a base station has a certain range. In order to allow wireless phones to make calls in a large area, many base stations are needed to enable the signal to cover this area. In this way, when the user is talking while moving, handover will occur. Normally, this switching takes 1 to 2 seconds, and sometimes it feels like a short pause. As long as other base stations with stronger signals can be searched in advance before the handover occurs, and the channel can be seized quickly when the original link is broken, the call can be guaranteed to be smooth, a...

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Application Information

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IPC IPC(8): H03L7/08H04B1/38H04B1/40
Inventor 张钊锋杨光辉吴珺刘欢艳杨隽
Owner 南京紫宸鼎芯微电子有限公司
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