Czasopismo | ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA | Rocznik 2013 - zeszyt 12

Low-power wide-frequency-range ring oscillator for temperature-controlled oscillator

nr katalogowy: 81423

Voltage-Controlled Oscillators (VCO s) are commonly used circuits in modern electronics and have many different applications, for example in PLLs (Phase-Locked Loops) or DPM (Dynamic Power Management) systems such as DFS (Dynamic Frequency Scaling). Growing requirements of these applications result with need of power-efficient oscillators with very wide tuning range and possibly small phase noise [1-3]. The paper describes structure and presents some simulation results of voltage-controlled ring oscillator with variable ring length. The circuit was designed in UMC CMOS 0.18 μm technology using full-custom technique and has very wide tuning range and small current consumption. Described generator is a part of Temperature-Controlled Oscillator (TCO ) which is a DFS-based DPM system. Related works In modern microelectronics the oscillator circuits are present in almost every project. There is plenty of applications for such circuits. Microprocessors and other digital circuits which are designed nowadays contain built-in PLLs. Radio transmitters and receivers for portable devices, which are becoming important part of the market of electronics, are also based on generators. As a result a lot of researcher’s attention has been put to design lowpower and wide-frequency-range oscillators in late years. The most popular choices of circuit structures with examples of applications will be shortly described in this section. Very frequently used structure of generator is resonant crosscoupled circuit [1][2]. Popularity of this type of circuit comes from the fact, that it is very well-known and it is quite easy to obtain high frequency of oscillations. What is additional advantage - LC circuit should produce accurate sinusoidal wave which means very low phase noise [3]. Usage of varactors in resonant circuit results with extremely easy control of the generated frequency by scaling voltage connected between the diodes. Unfortuna[...]

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