Broadband phase-looked loop frequency synthesizer

A frequency synthesizer and phase-locked loop technology, applied in digital transmission systems, electrical components, transmission systems, etc., can solve the problems of high system hardware overhead, achieve wide tunable range, low power consumption, and avoid current backflow Effect

Inactive Publication Date: 2004-01-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, this structure has the following problems: To achieve broadband tuning, a voltage-controlled oscillator with a large adjustable range is necessary
In addition, using switch technology to achieve a large tunable range also has the disadvantage of high system hardware overhead

Method used

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  • Broadband phase-looked loop frequency synthesizer
  • Broadband phase-looked loop frequency synthesizer
  • Broadband phase-looked loop frequency synthesizer

Examples

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Embodiment Construction

[0022] A kind of phase-locked loop frequency synthesizer that the present invention proposes is described in detail as follows in conjunction with accompanying drawing and embodiment:

[0023] The phase-locked loop frequency synthesizer structure of the present invention is as Figure 4 shown. It is composed of seven parts: frequency and phase detector, logic level conversion circuit, charge pump, loop filter, voltage-controlled oscillator, frequency divider and digital control module. These seven modules are connected in sequence to form a closed loop. Its connection relationship is: its input signal is the crystal oscillator reference input frequency f ref , control the clock CLK required for data input, control data DATA and address ADR; the output signal is the output F of the voltage controlled oscillator out =Nf ref . The input signal (clock CLK, data DATA and address ADR) of the frequency synthesizer is connected to the input terminal of the digital control module; ...

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Abstract

This invention relates to phase-locked loop frequency synthesizer containing a discriminator, a charge pump, ring filter, a voltage controlled oscillato, a frequency divider and a digit control module connected in sequence forming a closed ring circuit characterizing in a logic level converting circuit connected between the discriminator and the charge pump, solving the problem of limited adjustable frequency sphere met with using CMOS technique integrated phase-locked loop frequency synthesizer and adopting two sets of different powers to enlarge the voltage variance sphere of the VCO to broad band adjustment an low power loss of the frequency synthesizer, suppressing flow-back of the VCO module.

Description

technical field [0001] The invention belongs to the technical field of wireless transceivers, in particular to the structural design of an intermediate frequency synthesizer. Background technique [0002] A frequency synthesizer is a key building block in wireless transceiver and clock generation circuits. The function of the frequency synthesizer is: with a certain frequency point as the center, within a certain frequency range near the center point, any frequency within the frequency range can be generated through a certain control method. Generally, the requirement for the adjustable range of a frequency synthesizer is: the adjustable range reaches 20% of the center frequency, which is used to compensate the performance change caused by the frequency synthesizer integrated chip in the semiconductor production process and the use of the frequency synthesizer integrated chip The impact of ambient temperature changes on system performance. For broadband applications or mul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/16H04L7/033
Inventor 李永明陈弘毅王海永
Owner TSINGHUA UNIV
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