Download Low Power Vco Design In Cmos by Marc Tiebout PDF

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By Marc Tiebout

The functionality of voltage managed oscillators (VCO) is of maximum value for any telecommunication or facts communique approach. This sensible advisor develops a scientific, fully-integrated LC-VCO layout for low energy and occasional part noise, particularly helpful to fulfill the calls for on cellular units resembling mobile phones. The proposed VCO layout techniques are experimentally established with a number of totally built-in CMOS VCOs. The concise presentation is accessible in 3 components (VCO layout; CMOS units for VCO layout; and fully-integrated CMOS VCor GSM) and supplemented via an appendix summarizing the state-of-the-art.

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5 Inductor Scaling and Reuse 51 Fig. 15. Coil scaling testchip photograph and 4 to decrease the series resistance. The staggered winding widths further decrease the series resistance, while conserving the differential self-resonance frequency. A comparison between measured and predicted model parameters for the 6 windings layouts is shown in Fig. 21. A very good fit between predicted and extracted values is obtained. The deviation for the smallest coil series resistance is due to increased via resistances at the winding crossings.

3 Leeson’s Empirical Phase Noise Expression In 1966 Leeson [33, 67] set up the following empirical expression for the phase noise of a resonator-based VCO: L (ωc , ∆f ) = 10 log 2F kT 1+ Psig ωc 2QL ∆ω 2 1+ ∆ω1/f 3 |∆ω| . 10) 1 ∆ω2 1 ∆ω3 where QL is the loaded quality factor of the tank, ∆ω = 2π∆f is the angular frequency offset, and F is called the device noise excess factor or simply noise factor. ∆ω1/f 3 describes the flicker noise corner frequency and is not equal to the device flicker noise corner frequency.

Since we assume static parasitic components, the resistances and capacitances to the substrate can be split into two equal parts to complete the equivalent electrical circuit. 11 shows the resulting electrical circuit. In [29, 46, 69, 93] detailed CL P+ PCOx1 C Sub1 L RSub1 RS RSub2 COx2 C Sub2 Fig. 11. Low-order equivalent circuit methods and algorithms for the calculation of these lumped components can be found. For simple spiral coils CL normally can be neglected as the voltage difference between neighboring windings is small.

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