设计了一种应用于X波段本振移相的新型矢量合成移相器,该新型矢量合成移相器主要由4个3bit的子移相器组成,可以实现5bit的移相精度.该移相器降低了对可变增益放大器（Variable Gain Amplifier,VGA）的精度要求.可变增益放大器的可变增...
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设计了一种应用于X波段本振移相的新型矢量合成移相器,该新型矢量合成移相器主要由4个3bit的子移相器组成,可以实现5bit的移相精度.该移相器降低了对可变增益放大器（Variable Gain Amplifier,VGA）的精度要求.可变增益放大器的可变增益通过一组开关控制增益单元来实现,从而避免了传统正交矢量合成移相器中VGA偏置电流改变造成的线性度波动和漏源波动问题,故应用于本振移相时可以实现较小的移相增益误差和相位误差.为了验证该移相器的本振移相性能,设计了一个混频器作为测试电路.本设计采用0.13μm CMOS工艺实现,电源电压为1.2V.测试结果表明,在9-12GHz内,混频器在本振移相器驱动下的平均转换增益为-0.5-7dB,移相器的移相精度为5bit,均方根增益误差最大值为0.8dB,均方根相位误差最大值为4°.直流功耗为40mW.
A complete closed-loop third order s-domain model is analyzed for a frequency synthesizer. Based on the model and root-locus technique, the procedure for parameters design is described, and the relationship between th...
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A complete closed-loop third order s-domain model is analyzed for a frequency synthesizer. Based on the model and root-locus technique, the procedure for parameters design is described, and the relationship between the process,voltage,and temperature variation of parameters and the loop stability is quantitatively analyzed. A variation margin is proposed for stability compensation. Furthermore,a simple adjustable current cell in the charge pump is proposed for additional stability compensation and a novel VCO with linear gain is adopted to limit the total variation. A fully integrated frequency synthesizer from 1 to 1.05GHz with 250kHz channel resolution is implemented to verify the methods.
An accurate 1.08GHz CMOS LC voltage-controlled oscillator is implemented in a 0.35μm standard 2P4M CMOS process.A new convenient method of calculating oscillator period is *** this period calculation technique,the f...
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An accurate 1.08GHz CMOS LC voltage-controlled oscillator is implemented in a 0.35μm standard 2P4M CMOS process.A new convenient method of calculating oscillator period is *** this period calculation technique,the frequency tuning curves agree well with the *** a 3.3V supply,the LC-VCO measures a phase noise of -82.2dBc/Hz at a 10kHz frequency offset while dissipating 3.1mA *** chip size is 0.86mm×0.82mm.
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