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设计了一种低功耗、宽频率调谐范围的伪差分环形压控振荡器(VCO)。电路设计分为振荡环路设计和电流源设计两部分。在振荡器的振荡环路部分,提出了一种新颖的降低功耗的方法,即通过动态地调节接入振荡环路的锁存器,减小驱动电流,降低功耗;在振荡器的控制电源部分,采用gain-boost结构,设计了一款理想的可控双电流源,实现了振荡器的宽频率调谐范围。基于SMIC 65 nm工艺,在1.8 V工作电压下,对振荡器进行了后仿验证。结果表明,在频率为900 MHz时,振荡器的功耗仅为3.564 m W;当控制电压在0.6~1.8 V变化时,振荡器的频率调谐范围可宽达0.495~1.499 GHz。
A pseudo-differential ring voltage controlled oscillator (VCO) with low power consumption and wide frequency tuning range is designed. Circuit design is divided into the oscillation loop design and current source design of two parts. In the oscillating loop part of the oscillator, a novel method for reducing power consumption is proposed, that is, by dynamically adjusting the latch connected to the oscillation loop, the driving current is reduced and the power consumption is reduced; in the control of the oscillator Power supply section, using gain-boost structure, designed an ideal dual current source control, to achieve a wide range of oscillator frequency tuning. Based on the SMIC 65 nm process, the oscillator is modeled after a 1.8 V operation. The results show that the oscillator consumes only 3.564 mW at 900 MHz and 0.495-1.499 GHz when the control voltage varies from 0.6 to 1.8 V.