Sharif Digital Repository

A new class of design has been introduced in the RF circuits and Frequency Synthesizers, which is based on the digital circuits. Implementation of the digital synthesizers suppresses the need to use loop filter and thus reduces the loop lock time. In this thesis different topologies of digitally controlled oscillators using inductor and capacitor tank and all digital architectures used in high frequency all digital synthesizers in 0.18um CMOS technology has been inspected and simulated. Novel techniques introduced to improve the ring oscillator-based design’s specifications which doesn’t need inductor. Using the introduced techniques, the phase noise has been lessened acceptably with respect... 

With the advancement of the technology, Design of low power devices such as biomedical systems, wireless sensor network, portable devices and … has received more attention. Digitally controlled oscillator (DCO) is one of the sub-blocks in systems such as all digital phase locked loop (ADPLL) which consumes the major power of the system. Therefore, Design of a low power DCO will decrease the power consumption of the system significantly.
In this thesis, a digital control oscillator which is ultra low power is design for system on chip applications. Coarse-Fine architecture is used with binary weighted cells in this design. For the Coarse tuning stage, a new delay cell is proposed which...