标题: 应用于24 GHz 连续调频雷达之低功耗压控振荡器与低闪烁杂讯次谐波混频器
Low Power VCO and Low Flicker Noise Sub-Harmonic Mixer for 24GHz FMCW Radar Applications
作者: 林郁凯
Lin, Yu-Kai
钟世忠
Chung, Shyh-Jong
电信工程研究所
关键字: 振荡器;混频器;射频晶片设计;oscillator;mixer;RF IC design
公开日期: 2010
摘要: 本论文提出两个应用在 24 GHz 车用雷达系统收发机中的射频前端电路:
8 GHz 新式压控振荡器与16 GHz 低闪烁杂讯次谐波混频器,均以TSMC 0.18 μm 1P6M CMOS 制程实现。
8 GHz 新式压控振荡器,是以电流再利用为主要架构,透过串叠型式的交连
耦合对以及额外引入的可调式小尺寸交连耦合对,将差动两端的电晶体各别给予
不同的偏压电压以及偏压电流,藉此平衡差动两端不匹配的电晶体转导,改善原
本电流再利用架构之差动两端输出振幅不匹配的问题,可以将差动振幅精准匹配
至仅有0.15%的误差。其相位杂讯在1 MHz 位移时为-114 dBc/Hz,输出功率最
高为-2dBm,调频范围从7.707 GHz 至8.047 GHz,功耗为2.995 mW,FoM 可达
-187.1 dBc/Hz。
16 GHz 低闪烁杂讯次谐波混频器,以水平式次谐波混频器为基础电路架
构,采取大尺寸 PMOS 电晶体组成开关级,并利用折叠架构将转导级与开关级
之偏压电流分开设计,得以降低次谐波混频器中开关级电晶体的直流电流大小,
最后再加入电流补偿技术,使开关级直流电流可以进一步缩小,将闪烁杂讯转角
频率由原本8 MHz 降低至200 KHz。其转换增益为6.573 dB,IP1dB 为-14 dBm,
IIP3 为-4.08 dBm,白色杂讯指数为12.7 dB,直流功耗17.02 mW。
The thesis proposes two RF front-end circuits: a 8GHz novel VCO and a 16 GHz low flicker noise sub-harmonic mixer (SHM). Both can apply to 24GHz FMCW radar
applications and were fabricated with TSMC 0.18μm 1P6M process.
The proposed VCO adopts current-reused structure with a cascode cross-coupled pair and an additional tunable small size cross-coupled pair, giving different bias voltage and current to the differential MOSFETs, to reduce the inherently differential
transconductance mismatch with current-reused VCO. This strategy can exactly balance the differential amplitude with only 0.15% error. The phase noise equals to -114 dBc/Hz at 1MHz offset while consuming 2.995 mW and achieving a tuning
range from 7.707 to 8.047GHz.
The proposed SHM is based on SHM structure with PMOS switch stage, applying folded skill to separately design the DC current in switch stage form transconductance stage, to reduce the DC current in switch stage. In the end, this chip uses the current bleeding technique to more reduce the DC current. The flicker noise corner then could be restrained to 200 kHz from original 8 MHz. The Conversion Gain is 6.573 dB with IP1dB of -14 dBm, IIP3 of -4.08 dBm and White Noise Figure of 12.7 dB while consuming 17.02 mW。
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT079713631
http://hdl.handle.net/11536/44648
显示于类别:Thesis


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