A 3.2-to-7.3GHz Quadrature Oscillator with Magnetic Tuning

Cusmai, G.; Repossi, Matteo; Albasini, G.; Svelto, F.

doi:10.1109/isscc.2007.373603

Cited by 18 publications

(11 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previously implemented magnetically tuned VCOs [4], [6], [8] each used two multi-turn spiral inductors in a transformer configuration to achieve a high coupling coefficient. In this work however, multiple single-turn inductors are switched, which results in a higher and lower parasitic capacitance between the coils at the expense of a slight increase in area.…”

Section: Die Areamentioning

confidence: 99%

“…Note that the VCOs presented in [4], [6], [8] also employ magnetic coupling between the inductors. The VCO in [4] switches between the two modes of the capacitively loaded transformerbased resonator.…”

Section: Vco Measurementsmentioning

confidence: 99%

“…As indicated in [4], the high-frequency mode has a significantly lower , which explains the high phase noise of the VCO in that mode. In addition, the VCO in [6] is continuously tuned by varying the amplitude of the current in the secondary coil. Such continuous tuning across a wide range results in a large , which makes the VCO susceptible to noise.…”

Section: Vco Measurementsmentioning

confidence: 99%

“…The use of magnetic tuning has been proposed to increase the TRs of conventional VCOs in some recent publications [4]- [9]. Magnetic tuning can be achieved by switching extra inductors that are coupled to the primary inductor as in [8], or by discretely or continuously controlling the current in the secondary winding of a transformer as in [4] and [6], respectively. Even though the magnetically tuned VCOs described in the literature provide greater TRs than conventional VCOs, they have significantly higher phase noise and/or power dissipation.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Design of Wide Tuning-Range CMOS VCOs Using Switched Coupled-Inductors

Demirkan

Bruss

Spencer

2008

IEEE J. Solid-State Circuits

118

View full text Add to dashboard Cite

Two designs of voltage-controlled oscillators (VCOs) with mutually coupled and switched inductors are presented in this paper to demonstrate that the tuning range of an LC VCO can be improved with only a small increase in phase noise and die area in a standard digital CMOS process. Particular attention is given to the layout of the inductors to maintain across the tuning range. In addition, different capacitive coarse-tuning methods are compared based on simulated and measured data obtained from test structures. Implemented in a 90 nm digital CMOS process, a VCO with two extra coupled inductors achieves a 61.9% tuning range with an 11.75 GHz center frequency while dissipating 7.7 mW from a 1.2 V supply. This VCO has a measured phase noise of 106 dBc/Hz at 1 MHz offset from the center frequency resulting in a higher figure-of-merit than other recently published VCOs with similar operating frequencies. In addition, the area overhead is only 30% compared to a conventional LC VCO with a single inductor.Index Terms-Integrated transformers, phase noise, radio-frequency (RF) CMOS, switched coupled inductor, tuning range, voltage-controlled oscillator (VCO).

show abstract

Section: Die Areamentioning

confidence: 99%

Section: Vco Measurementsmentioning

confidence: 99%

Section: Vco Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of Wide Tuning-Range CMOS VCOs Using Switched Coupled-Inductors

Demirkan

Bruss

Spencer

2008

IEEE J. Solid-State Circuits

118

View full text Add to dashboard Cite

show abstract

“…Although variable inductors are more commonly used for impedance matching, their application in voltage-controlled oscillators (VCO) is also becoming a frequent topic in literature [3][4][5]. Many publications consider the variable inductor as a means to extend the tuning range of a VCO.…”

Section: Introductionmentioning

confidence: 99%

RF VCO tuning using MEMS piezoelectric actuated variable inductors

Casha

Grech

Micallef

et al. 2011

Analog Integr Circ Sig Process

View full text Add to dashboard Cite

This paper presents a study on the use of microsystems technology in the design of radio frequency voltage-controlled oscillators. In particular, the application of a micro-electro-mechanical systems (MEMS) based variable inductor for frequency tuning purposes is presented. Although traditionally a MEMS variable inductor is considered as a means to extend the tuning range, in this work it is shown that with correct inductor design it is also possible to facilitate and improve the voltage-controlled oscillator design in terms of phase noise response and power consumption in comparison to a design based on standard capacitive tuning.

show abstract

Frequency-Tunable Capability

Fabbro

Kayal

2010

Analog Circuits and Signal Processing

View full text Add to dashboard Cite

A 3.2-to-7.3GHz Quadrature Oscillator with Magnetic Tuning

Cited by 18 publications

References 2 publications

Design of Wide Tuning-Range CMOS VCOs Using Switched Coupled-Inductors

Design of Wide Tuning-Range CMOS VCOs Using Switched Coupled-Inductors

RF VCO tuning using MEMS piezoelectric actuated variable inductors

Frequency-Tunable Capability

Contact Info

Product

Resources

About