Differential VCO design with a wide frequency tuning range

Lin, Liang; Wang, Yin; Mao, Jun‐Fa; Wang, Yuyang

doi:10.1109/apmc.2006.4429578

Cited by 1 publication

(2 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in literature [1][2][3][4][5][6][7], traditional differential delay units can only function as inverter unit and cannot be used for fixed delay unit. If the traditional differential delay unit has a fixed delay function, it can be controlled to perform inverter unit or fixed delay unit.…”

Section: Design a New Differential Delay Unitmentioning

confidence: 99%

“…Differential ring oscillator are used in baseband signal generation, modulation, demodulation, and other functions to assist baseband signals in rapid changes in code rate and code phase. Currently, the most mature frequency adjustment methods for differential ring oscillators include changing the number of stages of differential inverter units or the delay time of inverter units by combining them with analog switch [1][2][3], using ring oscillators based on voltage-controlled oscillators to adjust frequency [1,[4][5], and reconfigurable PUFRO [6]. Changing the number of stages of differential delay units need to add analog switch, which can affect the oscillation frequency and duty cycle.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design of a fixed number stage programmable differential ring oscillator

cai,

liang,

chen

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

View full text Add to dashboard Cite

Aiming at the problem that the frequency and phase adjustment of ring oscillator requires changing the number of inverter stages and analog switch's selection position, a fixed number stages programmable differential ring oscillator is proposed. By adding an exclusive-OR gate to the input of the traditional differential delay unit, a new differential delay unit is designed. The new differential delay unit can be programmed to perform inverter unit or fixed delay unit functions. Through the derivation of the truth table of the new differential delay unit, when the input logic level of the exclusive-OR gate is low, the new differential delay unit performs the inverter unit function. When the input logic level of the exclusive-OR gate is high, the new differential delay unit performs the fixed delay unit function. Using a fixed number stages, multiple stages in series, and closed-loop feedback connection, a fixed number stages programmable differential ring oscillator is designed. By programming the number of high and low logic levels at the input of the exclusive-OR gate, the number of inverter units and fixed delay units of the programmable differential ring oscillator is controlled. So the programmable differential ring oscillator can achieve the frequency and phase adjustment. Taking a four stages programmable ring oscillator as an example, the principle of how to achieve frequency adjustment and phase adjustment of is introduced. In the multisim software, the circuit simulation of the four stages programmable differential ring oscillator is performed, achieving and phase adjustment. Frequency adjustment include 1, 2, and 4 divisions. It is verified that the fixed number stages programmable ring oscillator can achieve frequency adjustment and phase adjustment without reconfiguring the circuit.

show abstract

Section: Design a New Differential Delay Unitmentioning

confidence: 99%