本文關(guān)鍵詞：10GHz自適應(yīng)鎖相技術(shù)的研究　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 自適應(yīng) 鎖相技術(shù) 相位噪聲 鑒相

【摘要】：鎖相技術(shù)自被提出以來,以其優(yōu)越的性能優(yōu)勢(shì)廣泛被應(yīng)用于各個(gè)領(lǐng)域。模擬鎖相環(huán)擁有高頻、頻譜特性好等數(shù)字鎖相環(huán)不具有的優(yōu)勢(shì),而近年提出的自適應(yīng)鎖相技術(shù)還克服了傳統(tǒng)模擬鎖相環(huán)壓控振蕩器輸出振蕩頻率會(huì)出現(xiàn)較大相位瞬變的缺點(diǎn),因此該技術(shù)在高品質(zhì)振蕩器技術(shù)方面正得到廣泛應(yīng)用。本文研究的自適應(yīng)鎖相技術(shù),與傳統(tǒng)的鎖相系統(tǒng)利用參考信號(hào)與壓控振蕩器輸出對(duì)比進(jìn)行鑒相不同,該方法先對(duì)壓控振蕩器輸出的信號(hào)經(jīng)過放大后,再按一定比例分成兩部分進(jìn)行處理,最后進(jìn)行鑒相。其中一部分信號(hào)通過使用外差法的高載波抑制組件進(jìn)行處理,得到低噪聲誤差信號(hào),輸入到作為鑒相器的二極管雙平衡混頻器的射頻端口,而另一部分信號(hào)通過可變移相器,其相位被調(diào)節(jié)到與射頻端口信號(hào)相位相差90°后輸入到混頻器的本振端口。兩路信號(hào)混頻之后輸出一個(gè)電平,該電平能夠準(zhǔn)確反應(yīng)壓控振蕩器的輸出頻率與被鎖參考信號(hào)的頻率偏移。該電平信號(hào)被環(huán)路濾波器濾除高頻部分后,得到一個(gè)電壓近似與頻率偏移成線性關(guān)系的低頻信號(hào)。該信號(hào)與一可調(diào)直流偏壓通過加法器合成后得到壓控振蕩器的調(diào)諧電壓后送入壓控調(diào)諧端完成鎖相。該方法所使用的鑒相器是高性能二極管混頻器,因此其調(diào)幅和調(diào)相噪聲相對(duì)于壓控振蕩器的噪聲低,可忽略不計(jì)。系統(tǒng)的相位噪聲主要來自放大器、高載波抑制的組件和移相器。本文基于上述理論對(duì)鎖相系統(tǒng)進(jìn)行了設(shè)計(jì)和仿真,并對(duì)系統(tǒng)中需要使用的關(guān)鍵部件如壓控振蕩器、定向耦合器、移相器、混頻器、加法器、環(huán)路濾波器等進(jìn)行了制作和測(cè)試,最后將這些器件指標(biāo)代入鎖相環(huán)路模型完成了仿真和相位噪聲的計(jì)算。仿真結(jié)果表明系統(tǒng)是穩(wěn)定的,計(jì)算出的相位噪聲也優(yōu)于傳統(tǒng)鎖相技術(shù)的實(shí)現(xiàn)結(jié)果,初步證明了自適應(yīng)鎖相技術(shù)的可行性。
[Abstract]:Since it was proposed, PLL has been widely used in various fields because of its superior performance advantages. Analog PLL has the advantages of high frequency, good spectrum characteristics and other digital PLL does not have the advantages. The adaptive phase-locked technique proposed in recent years also overcomes the shortcoming of the traditional analog phase-locked loop voltage-controlled oscillator that the frequency of output oscillation will be large phase transient. Therefore, this technology is widely used in high quality oscillator technology. The adaptive phase-locking technology studied in this paper is different from the traditional phase-locked system using reference signal and VCO output to detect phase. This method first amplifies the output signal of the VCO and then divides it into two parts according to a certain proportion. Some of the signals are processed by using the high carrier suppression component of the heterodyne method to get the low noise error signal and input to the RF port of the diode dual balance mixer as the phase discriminator. The other part of the signal is controlled by a variable phase shifter whose phase is adjusted to the local oscillator port of the mixer after the phase difference between the phase of the radio frequency port and the radio frequency port signal is 90 擄, and a level is output after the two signals are mixed. The level can accurately reflect the deviation of the output frequency of the voltage controlled oscillator from the frequency of the locked reference signal, which is filtered out of the high frequency part by the loop filter. A low frequency signal with a linear relationship between voltage and frequency offset is obtained. The signal is synthesized with an adjustable DC bias through adder to obtain the tuning voltage of the voltage-controlled oscillator and then sent to the voltage-controlled tuning terminal to complete the phase-locking. The phase discriminator is a high performance diode mixer. Therefore, the noise of amplitude modulation and phase modulation is lower than that of voltage-controlled oscillator. The phase noise of the system is mainly from the amplifier. High carrier suppression components and phase shifters. Based on the above theory, this paper designs and simulates the phase-locked system. The key components of the system such as VCO, directional coupler, phase shifter, mixer are designed and simulated. The adder and loop filter are fabricated and tested. Finally, the simulation and phase noise calculation are completed by inserting these device parameters into the PLL model. The simulation results show that the system is stable. The calculated phase noise is also better than that of the traditional phase-locked technique, which proves the feasibility of the adaptive phase-locked technique.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN911.8

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 歐陽璽;高性能抗輻射壓控振蕩器設(shè)計(jì)與實(shí)現(xiàn)[D];國防科學(xué)技術(shù)大學(xué);2011年

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本文編號(hào)：1397430