一种新型低压低功耗伪差分环形压控振荡器设计

摘要

A novel low-voltage and low-dissipation pseudo ring voltage-controlled oscillator (VCO) was proposed,based on cross coupling technology.The schematic includes the pseudo-differential ring VCO core and output shaping buffer.An inverter controlled by tail current source was used as the delay cell,which composed the novel low-voltage and low-dissipation pseudo-differential ring VCO.Moreover,linear technology was applied to improve the tuning linearity.Utilizing the output buffer circuit to trim the ring VCO's wave form,the proposed circuits eliminate the limitation of output swing which cannot reach the rail-to-rail output swing.The circuit was designed by 0.13 μm standard CMOS process,and simulated by the spectre in cadence under the supply voltage of 1.2V.The pre-simulation results show that the VCO's phase noise is only-100.58 dBc/Hz@1MHz,the power dissipation is 0.92 mW,the design shows a good tuning linearity between the voltage range from 0.45 to 1V,the frequency tuning range is from 0.303 to 1.63 GHz,and it can also work at 1V supply voltage.%基于交叉耦合技术提出了一种新型低压低功耗伪差分环形压控振荡器(VCO).电路整体包括新型伪差分环形压控振荡器、输出整形缓冲(buffer)电路两个部分.在VCO电路中采用了尾电流源控制的反相器为基本延时单元,实现了一种新型低压低功耗伪差分环形振荡器设计,并采用线性化技术改善调节线性度.利用输出buffer对VCO输出波形进行整形,消除了这种结构下输出摆幅受到尾电流源影响而不能达到轨到轨摆幅的限制.基于0.13 μm标准CMOS工艺,利用cadence spectre进行仿真验证,前仿真结果表明在电源电压为1.2V时,该VCO相位噪声为-100.58dBc/Hz@1 MHz,功耗为0.92 mW,在0.45～1V的电压范围内,频率调谐范围宽达0.303～1.63 GHz,具有非常好的调节线性度,在电源电压为1V时仍然能正常工作.