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Combination circuit structure consisting of phase detection discriminator and charge pump applied to phase-locked loop

A technology of phase detector and frequency detector and combined circuit, which is applied in the field of phase detector and frequency detector and charge pump combined circuit structure, can solve the problems of harsh phase-locked loops and cannot meet the requirements of wireless transceivers, etc., and achieves the effect of eliminating charge sharing

Active Publication Date: 2012-06-27
北京中科微投资管理有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these improvements cannot meet the increasingly stringent requirements for phase-locked loops in wireless transceivers.

Method used

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  • Combination circuit structure consisting of phase detection discriminator and charge pump applied to phase-locked loop
  • Combination circuit structure consisting of phase detection discriminator and charge pump applied to phase-locked loop
  • Combination circuit structure consisting of phase detection discriminator and charge pump applied to phase-locked loop

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0025] figure 2 A schematic diagram of the circuit structure of the phase-frequency discriminator and the charge pump provided by the present invention is shown, which is formed by connecting the phase-frequency discriminator and the charge pump circuit in sequence, and the charge pump includes a bias circuit, a reference circuit and a main circuit.

[0026] The phase and frequency discriminator in the present invention is as image 3 As shown, the output signal state is determined by the rising edge of the input signal. When the reference signal fref leads the feedback signal fdiv, the output upx is high and will be reset by the rising edge of the subsequent feedback signal fdiv; when the signal fdiv leads the referenc...

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Abstract

The invention discloses a combination circuit structure consisting of a phase detection discriminator and a charge pump applied to a phase-locked loop. The combination circuit structure consists of the phase detection discriminator and the charge pump which are connected in turn, wherein the phase detection discriminator is used for discriminating a phase difference and a frequency difference between a reference signal fref and a feedback signal fdiv so as to generate a phase difference or frequency difference signal and a sign bit; and the charge pump supplies charging or discharging currentto a loop filter with a low-pass characteristic according to the output of the phase detection discriminator. The structure has the advantages of overcoming charge sharing, charge injection and clockfeedforward caused by the switch-on / switch-off of the conventional charge pump, eliminating the output time delay difference of the conventional phase detection discriminator and improving the frequency spectrum performance of the phase-locked loop.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a combination circuit structure of a phase-detection-frequency discriminator and a charge pump applied to a phase-locked loop. Background technique [0002] The phase-locked loop is a key module in the design of the wireless transceiver. It outputs a series of high-precision frequency signals to provide local oscillator signals for the frequency conversion of the transceiver. Among various phase-locked loop structures, the charge pump phase-locked loop is widely used because of its excellent characteristics of low power consumption, high speed, low jitter and low cost. The charge pump phase-locked loop structure is as figure 1 As shown, it consists of a phase frequency detector, a charge pump, a loop filter, a voltage controlled oscillator and a frequency divider connected in sequence, and the frequency divider is connected between the input terminal of the phase frequency...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/085H03L7/08
Inventor 黄水龙王小松张海英
Owner 北京中科微投资管理有限责任公司
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