This paper presents the design of a voltage controlled oscillator (VCO) with small VCO gain (Kvco) variation. To compensate large Kvco variation, a series varactor bank has been added to the conventional LC-tank with parallel capacitor bank array. Implemented in a 0.13m CMOS RF technology, the proposed VCO can be tuned from 4.6GH to 5.5GHz with the Kvco variation of less than 9.6%. While consu...

ADi erentially controlled monolithic LC-VCO along with a di erential charge pump are used to implement a di erential PLL for substrate noise immunity. The di erential VCO control is achieved with minimal increase in the power consumption and without sacri cing the tuning range. In a 0.5 m CMOS technology the measured VCO phase noise is -119dBc @1.0MHz and the tuning range is 26% of the 1.25GHz ...

by Yang Zhang, M.S. Washington State University December 2007 Chair: Deukhyoun Heo This thesis presents novel designs of low-phase-noise 0.18μm CMOS LC voltage controlled oscillator (VCO) and quadrature VCO (QVCO) for 5-6GHz wireless communications applications. Using a new capacitor tapping technique, the phase noise of CMOS LC oscillators is lowered based on the improvement of loaded-Q improv...

<p>In this research, we present a low phase noise (PN) and wide tuning range 175 GHz inductors capacitors (LC) voltage-controlled oscillator (VCO) based on differential Colpitts that was designed using 0.13 μm bipolar complementary metal oxide semiconductor (BiCMOS) simulated. The square of the tank Q-factor oscillation amplitude were both maximized to reduce PN. With an extensive examina...

We demonstrate the design of a novel voltage-controlled oscillator (VCO), which is based on a metal-oxide-semiconductor field-effect transistor (MOS) differential amplifier with active load. This VCO achieves low phase noise and wide tuning range. The phase noise is –120 dBc/Hz at 600 KHz offset from a 1.216 GHz carrier frequency. This value is comparable to that of a LC-based integrated oscill...

This paper describes the design and optimization of voltage controlled oscillators with quadrature outputs. Systematic design of fully integrated LC-VCOs with a high inductance tank leads to a cross-coupled double core LC-VCO as the optimal solution in terms of power consumption. Futhermore, a novel fully differential frequency tuning concept is introduced to ease high integration. The concepts...

The 402-405 MHz MICS (Medical Implant Communication Service) band has recently been allocated by the US Federal Communication Commission (FCC) with the potential to replace the low frequency inductive coupling techniques in implantable devices. This band was particularly chosen to provide full-integration, low-power, faster data transfer and longer communication range. This paper investigates t...

A new design for an ultra-low power, low phase noise differential 10 GHz LC voltage-controlled oscillator (VCO) which is biased in the subthreshold regime, is presented in the 0.18 μm CMOS process, for the first time. The designed circuit topology is an NMOS only cross-coupled LC-tank VCO which has an extra symmetric centre tapped inductor between the source ends of the cross-coupled transistor...

This paper describes 3-GHz and 7-GHz tunableinductance LC-tank voltage-controlled oscillators (VCOs) implemented in 0.18-μm CMOS technology. Unlike the traditional tuning method by a varactor, a tunable inductor is employed in the VCO by using a transformer to compensate for the energy loss. The VCO facilitates the tuning frequency and low noise of the output signals, together with a variable i...