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Low Voltage Oscillator Design with the Lowest Reported Phase Noise in the 1/F3 Region at 3.6 GHzTitle
,
M.Sc. Thesis
Sharif University of Technology
;
Fotowat Ahmady, Ali
(Supervisor)
;
Akbar, Fatemeh
(Supervisor)
Abstract
Oscillators are an important building block in the design of synthesizers for RF system applications. State-of-the-art operation defines that an oscillator should have the best spectral purity while consuming a low amount of power. In recent years, several methods have been presented for reducing phase noise separately in the 1/f2 and 1/f3 regions. As CMOS technology advances, the amount of power supplies decreases, which worsens the inherent flicker noise. In this thesis, it has been tried, while investigating the existing methods in the phase noise in this region, it presents the proposed oscillator which is based on a three-coupled transformer. This voltage bias oscillator operates at a...
Enhancement Of the Quality In PET Brain Images Using AutoGANcoder Algorithms
, M.Sc. Thesis Sharif University of Technology ; vosoughi, Naser (Supervisor) ; Ghafarian, Pardis (Co-Supervisor) ; Attari, Ali Akbar (Co-Supervisor)
Abstract
Positron Emission Tomography (PET) is a cutting-edge medical imaging technique that enables the examination of functional activities in different regions of the body, particularly the brain. This technique involves injecting a radiopharmaceutical into the body, which emits gamma rays that are subsequently detected by the PET scanner to generate images. However, a significant challenge in PET imaging is the degradation of image quality due to noise and photon scattering, which can lead to diagnostic errors, especially in sensitive applications such as detecting brain diseases. Various image reconstruction techniques have been developed in the past to mitigate attenuation and scattering...