在射頻收發機裡,壓控振盪器的相位雜訊好壞會有3種影響,(1)增加數位通訊位元錯誤率,(2)降低收發機的靈敏度,(3)造成訊號抖動,所以把壓控振盪器雜訊的降低,是很重要的事.
首先,本論文先做一個互補式考畢茲壓控振盪器,在供應電壓1.5V時,振盪器在10.2GHz時相位雜訊為-118.7dBc/Hz,FOM是-191.72dBc/Hz.功耗為5.2mW.可調範圍有1.8GHz,從10.04GHz到11.84GHz,控制電壓從0V到1.5V.接著設計互補式考畢茲四相位壓控振盪器.在供應電源1.5V時,總功耗是6.72mW.可調頻率比有15.37%,可調範圍由10.24到11.98GHz可調電壓由0V到1.5V.此四相位壓控振盪器由台積電0.18製程晶片面積為0.811 1.38 .量測相位雜訊-116.39dBc/Hz在10.24GHz.FOM為-188.3dBc/Hz.
其次,提出一個優質的LC tank 四相位壓控振盪器,在供應電壓0.7V時,功耗是2.58mW.可調範圍從5.15GHz到5.55GHz,可調電壓從0V到0.7V. 在振盪頻率5.28GHz下量測到的相位雜訊-120.88dBc/Hz.FOM為-191.21dBc/Hz.
最後一個晶片為雙頻帶四相位壓控振盪器,使用Sige18製程,在供應電壓為1.6V下,總核心功耗為11.52mW.低頻和高頻的可調範圍從3/6.14GHz到2.65.71GHz可調電壓從0/1.4V到1.3/2V.在振盪頻率2.99/6.07GHz下量測到的相位雜訊是-128.97/-123.47dBc/Hz,在高底頻的FOM都是-188dBc/Hz.

In the RF transceiver, the VCO’s phase noise is good or bad will have the effect to (1) increase of digital communication bit error rate, (2) reduce the sensitivity of the transceiver, (3) increase signal jitter,so reduced voltage-controlled oscillator’s phase noise is a very important.
First, this thesis designs complementary Colpitts voltage controlled oscillator, At the supply voltage of 1.5 V, the output phase noise of the VCO is -118.7dBc/Hz at 1MHz offset frequency from the carrier frequency of 10.2 GHz, and the figure of merit is -191.72dBc/Hz. The VCO core power consumption is 5.2 mW. Tuning range is about 1.8GHz, from 10.04 to 11.84 GHz, while the control voltage was tuned from 0 V to 1.5 V. And we design complementary Colpitts QVCO. At the supply voltage of 1.5 V, the total power consumption is 6.72 mW. The free-running frequency tuning range is 15.37 %, tunable from 10.24 to 11.98 GHz as the tuning voltage is varied from 0.0 V to 1.5 V. The QVCO has been implemented with the TSMC 0.18 μm CMOS technology and the die area is 0.811 ×1.38 mm2. The measured phase noise at 1 MHz offset is -116.39 dBc/Hz at the oscillation frequency of 10.24 GHz and the figure of merit (FOM) of the proposed QVCO is about -188.3 dBc/Hz.
Secondly, we propose a high-quality LC tank quadrature voltage-controlled oscillator. At the supply voltage of 0.7 V, the total power consumption is 2.58 mW. The free-running frequency of the QVCO is tunable from 5.15 GHz to 5.55 GHz as the tuning voltage is varied from 0 V to 0.7 V. The measured phase noise at 1 MHz frequency offset is -120.88 dBc/Hz at the oscillation frequency of 5.28 GHz and the figure of merit (FOM) of the proposed QVCO is -191.21 dBc/Hz.
Finally,chapter is a dual band QVCO, useing 0.18 μm SiGe technology, At the supply voltage of 1.6 V, the total core power consumption is 11.52 mW. The low-/high-band free-running frequency of the QVCO is tunable from 3/6.14 GHz to 2.6/5.71 GHz as the tuning voltage is varied from 0.0/1.4 V to 1.3/2 V. The measured phase noise at 1MHz frequency offset is -128.97/-123.47 dBc/Hz at the oscillation frequency of 2.99/6.07 GHz and the high-/low-band figure of merit (FOM) of the proposed QVCO is about -188.0dBc/Hz.

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