Frequency synthesizer is a key building block of fully-integrated wireless communications systems. Design of a frequency synthesizer (FS) requires the understanding of not only the circuit-level but also of the transceiver system-level considerations. The FS design challenge involves strong trade-offs, and often conflicting requirements. In this tutorial, the general implementation issues and r...

The aim of this thesis is to investigate techniques for, and applications of automatic sound synthesizer programming. An automatic sound synthesizer programmer is a system which removes the requirement to explicitly specify parameter settings for a sound synthesis algorithm from the user. Two forms of these systems are discussed in this thesis: tone matching programmers and synthesis space expl...

In this paper, a new pure-digital frequency synthesizer Fout=(X/Y)•Fin for square-waves with controlled precision is described. Given that Fin is the input reference frequency provided by a stable crystal oscillator, Fout is the synthesized frequency; X and Y are two co-prime integer numbers. The purpose is to demonstrate that with exclusively simple digital techniques, a frequency synthesizer ...

The paper reports the implementation of a frequency synthesizer for system-on-chip (SOC) design. The epi-digital CMOS process is used to provide SOC solution. This work focuses on low-power consumption to achieve longer life-time of batteries. A 2.4GHz frequency synthesizer has been fabricated in 0.18μm epi-digital CMOS technology for ZigBee applications, which consumed 7.95mW from 1.8V supply....

This paper presents an efficient indirect fractional frequency synthesizer architecture based on the time delay digital tanlock loop. The indirect type frequency synthesis systems incorporate a low complexity high performance adaptation mechanism that enables them to remain in a locked state following the division process. The performance of the proposed fractional-N synthesizer under various i...

Synthesizers have become commonplace in music production due to their ability create a diverse and unique timbre. However, many users find it difficult control synthesizer the complexity of relationship between synthesis parameters output sound. As such, sound matching task focuses on estimation that recreate target as closely possible within capabilities synthesizer. In this paper, we introduc...

This paper presents a complete noise analysis of a ΣΔ-based fractional-N phase-locked loop (PLL) based frequency synthesizer. Rigorous analytical and empirical formulas have been given to model various phase noise sources and spurious components and to predict their impact on the overall synthesizer noise performance. These formulas have been applied to an integrated multiband WLAN frequency sy...

Frequency synthesis has many applications in today’s commercial electronic and telecommunications system design. Some techniques exist which can be used to generate a frequency that is an integer or fractional multiple of a reference frequency. This paper describes architecture a new pure digital frequency synthesizer based on generators, counters and a register. The technique described here is...

This paper discusses a hybrid audio synthesis method employing both additive synthesis and DPCM audio playback, and the implementation of a miniature synthesizer system that accepts MIDI as an input format. Additive synthesis is performed in the frequency domain using a weighted overlap-add filterbank, providing efficiency gains compared to previously known methods. The synthesizer system is im...