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- Title
STABILITY OF SEVERAL TYPES OF HIGH FREQUENCY RING OSCILLATORS DEPENDING ON CIRCUIT CONFIGURATIONS AND PARAMETERS.
- Authors
FĂRCAȘ, Călin; AGRIJAN, Ramona; HINTEA, Sorin
- Abstract
This paper proposes studying the performance of the PLL loop depending on the configurations of the voltage-controlled oscillators used and on the types of ring oscillators. The oscillation frequency depends on the oscillator structure, the size of the CMOS transistors, the supply voltage, the control voltage, and the load capacity. In several configurations, ring oscillators and VCOs were used, with several gate types and several sizes of CMOS transistors. We also added an inverter to the output of the studied oscillators and demonstrated the increase of the robustness of a PLL loop in a larger frequency range. By measurements, we have shown that the oscillation frequency is no longer influenced by the variation of the load capacity. We measured the phase-locked time for the PLL loops and demonstrated that by using the inverter at the oscillator's output to the load, we obtain the shortest time. The implementation and simulation of the circuits used in this paper were performed in the LT Spice XVII simulator. The simulations were performed transiently, with the duration set in such a way that the results are interpreted properly.
- Subjects
PHASE-locked loops; FREQUENCIES of oscillating systems; VOLTAGE-controlled oscillators; VOLTAGE control; COMPLEMENTARY metal oxide semiconductors; TRANSISTORS
- Publication
Acta Technica Napocensis. Electronica-Telecomunicatii, 2021, Vol 61, Issue 1, p7
- ISSN
1221-6542
- Publication type
Article