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Double-loop frequency synthesizer and phase noise analyzing method

A technology of frequency synthesizer and phase noise, which is applied in the field of frequency synthesizer to achieve the effect of simple and good phase noise characteristics

Inactive Publication Date: 2010-06-23
FUDAN UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Too many switched capacitor arrays, neither routing nor parasitics, are acceptable

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  • Double-loop frequency synthesizer and phase noise analyzing method
  • Double-loop frequency synthesizer and phase noise analyzing method
  • Double-loop frequency synthesizer and phase noise analyzing method

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Embodiment Construction

[0027] The specific implementation modes provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] Such as figure 2 as shown, figure 2 It is a structural schematic diagram of the first embodiment of the dual-loop frequency synthesizer of the present invention. A double-loop frequency synthesizer, comprising: phase frequency detector (PFD) 100, charge pump (CP 1 、CP 2 ) 110, 120, voltage controlled oscillator (VCO) 130, frequency divider (DIV) 150, resistor (R 1 ), capacitance (C 1 、C 2 、C 3). The above components together form the coarse adjustment loop 2 and the fine adjustment loop 1 of the dual-loop frequency synthesizer. Among them, PFD100 and DIV150 are shared by two loops. The VCO130 is also shared by the two loops, but the VCO130 has two input control terminals vc1 and vc2, which are respectively connected to the filter outputs in the coarse-tuning loop 2 and the fine-tuning loop 1. R 1 、C 1...

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Abstract

The invention relates to a double-loop frequency synthesizer and a phase noise analyzing method. The double-loop frequency synthesizer comprises a crude regulation loop and a fine regulation loop, wherein the crude regulation loop comprises a frequency and phase discriminator, a charge pump, a filtration capacitor, a voltage-controlled oscillator and a programmable divider sequentially connected with each other; and the fine regulation loop comprises a frequency and phase discriminator, a charge pump, a loop filter, a voltage-controlled oscillator and a programmable divider sequentially connected with each other; and the frequency and phase discriminator, the voltage-controlled oscillator, the programmable divider and the crude regulation loop are shared. The phase noise analyzing method of the double-loop frequency synthesizer obtains the noise transfer function of each noise source in the double-loop frequency synthesizer by obtaining the transfer function of a crude regulation branch, a fine regulation branch and a common loop. The phase noise of the double-loop frequency synthesizer is lower than that of a single-loop frequency synthesizer under the same condition.

Description

【Technical field】 [0001] The invention relates to a frequency synthesizer, in particular to a double-loop frequency synthesizer and a phase noise analysis method thereof. 【Background technique】 [0002] A frequency synthesizer is a device used to generate a stable, high-precision series of frequencies. There are two common frequency synthesizers: phase-locked loop (PLL)-based frequency synthesizers and direct digital frequency synthesizers. Among them, the frequency synthesizer based on the phase-locked loop has the characteristics of low cost and high performance, especially suitable for high frequency synthesis, and has been widely used in high-speed digital systems, digital mobile communication equipment and high-precision control systems to generate accurate frequency clocks signal and high frequency carrier signal. [0003] Such as figure 1 As shown, it is a typical structural diagram of a frequency synthesizer based on a phase-locked loop, which consists of five par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/23
Inventor 任俊彦陈丹凤傅海鹏李巍叶凡李宁
Owner FUDAN UNIV
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