A Ka-Band Distributed Voltage-Controlled Oscillator With Constant 15-dBm Output Power

Chang, Sheng-Fuh; Wei, Muh‐Dey; Chang, Shuen-Chien; Chih, Ting-Yuen; Wu, Jen-Chieh; Chen, Jia‐Liang

doi:10.1109/istmwc.2007.4299199

Cited by 2 publications

(2 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A DVCO is based on a Distributed Amplifier (DA) operating in the reverse gain mode [9][10][11][12], or in the forward gain mode [13][14][15][16][17][18][19][20]. DVCOs are also known as travelling wave VCOs which belong to the class of wave-based oscillators wherein there are the rotary-travelling wave VCOs (also called closed-loop Distributed VCOs) and standing-wave VCOs [21].…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of wideband distributed VCOs based on switched-cells tuning technique

Cannone

Avitabile

2015

Analog Integr Circ Sig Process

View full text Add to dashboard Cite

The paper discusses a VCO belonging to the class of Distributed-VCOs (DVCOs) designed for wide tuning range operations. The trade-off between wide bandwidth and phase noise is central to the proposed design and the paper covers the DVCO topology and discusses its operations in detail, starting by the general conditions of oscillation and covering the applied tuning techniques. In particular the paper reports a description of the so called ''switched-cells tuning technique''. The design of a fully integrated DVCO is reported. It is based on the ''switched-cells tuning technique'' and provides the following measured tuning ranges over four sub-bands: 219 MHz around 900, 291 MHz around 1.5 GHz, 392 MHz around 1.8 GHz and 199 MHz around 2.4 GHz. The DVCO performances are discussed and compared with other similar implementation reported in the recent literature showing the potentialities of the proposed approach. According to the reported theory, the results show the applicability of the proposed Distributed VCOs for wide bandwidth applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Analysis and design of wideband distributed VCOs based on switched-cells tuning technique

Cannone

Avitabile

2015

Analog Integr Circ Sig Process

View full text Add to dashboard Cite

show abstract

“…Inspired by the distributed oscillator first presented in [75][76] a similar three section circuit was implemented in integrated form [94] achieving a 27 GHz (central frequency) tunable oscillator (26.4 GHz-27.4 GHz) with a 15 ± 0.9 dBm across the tuning range. Another contribution focused on an integrated DVCO exploiting MOS varactor pairs placed along the feedback path to provide frequency tuning, retaining a close analogy with a previously published work [86] for what concerns the layout technology (folded coplanar waveguides used as inductive elements) and the active devices used [95].…”

Section: State Of the Art In Distributed Oscillators And Vcomentioning

confidence: 99%

Nonlinear simulation and design of microwave, multi-device distributed autonomous circuits

Acampora

View full text Add to dashboard Cite

It is widely believed that many drawbacks in today's wireless communication paradigm might be relieved by enabling high carrier frequency transmission, and endowing both the network and the user equipment with some degree of reconfigurability. The urgency of a new framework in wireless digital transmission which should allow for higher bit rate, lower latency and tighter delay constraints, led us to investigate the fundamental building blocks which, at the circuital/device level, will foster a change towards more efficient communication schemes, delivering a more satisfactory end user experience. Specifically, this work deals with the inherently analog devices, found at the core of each transceiver module and capable of providing the carrier signal; these are the oscillators. In particular, two distinct classes of oscillators are regarded central to our contribution. One class is constituted by N-push oscillators, which thanks to coupling effect of N identical core oscillators allow N-fold harmonic generation (and thus high frequency transmission). The second class is constituted by wideband tunable oscillators, whose topology derives from a feedback distributed amplifier and therefore called distributed oscillators; by adequately altering the bias level at each section Distributed Voltage Controlled Oscillators can be implemented (which can scan a wide frequency range). The introductory part of this work, deals with their operation principles in great detail. As microwave oscillators are nonlinear devices, a full nonlinear analysis, synthesis, and optimization is considered for their implementation. Consequently, nonlinear numerical techniques have been reviewed in the second part of the thesis. Particularly, the role of Harmonic Balance simulations and the auxiliary generator/probe method for obtaining the oscillator solutions has been emphasized; the overall research goal of this dissertation is to show that the former techniques are very effective in obtaining detailed information about the periodic steady state behavior for the two class of circuits being investigated. A triple-push oscillator topology has been initially considered. Provided a certain phase distribution is maintained among the oscillating elements, the output power of the third harmonic increases while the lower order harmonics cancel out, which represents the default operating mode. Due to circuit symmetry, to the presence of delay in the coupling network and to unavoidable mismatches, unwanted oscillating modes might coexist with the intended one. A design strategy relying on the Harmonic Balance parametric analysis of the oscillating voltage at a selected node in the coupling network with respect to coupling phase and coupling strength is presented, to the aim of quenching undesired oscillation modes. Moreover the design of a four stage reverse mode distributed voltage controlled oscillator (DVCO) has been described. All the design steps have been reported, from a very idealized, purely behavioral design to a very concrete one, involving details derived from electromagnetic simulations. Harmonic Balance techniques were used to evaluate its tuning function, output power and DC current consumption, which have been completely characterized across the tuning bandwidth. Finally, a method for an optimized design with reduced variations in the output power has been presented. An alternative implementation, targeting wider tuning ranges/ higher oscillation frequencies was introduced. The measurements performed on the fabricated prototypes revealed good agreement with the simulation results, confirming the validity of the approach.

show abstract

A Ka-Band Distributed Voltage-Controlled Oscillator With Constant 15-dBm Output Power

Cited by 2 publications

References 12 publications

Analysis and design of wideband distributed VCOs based on switched-cells tuning technique

Analysis and design of wideband distributed VCOs based on switched-cells tuning technique

Nonlinear simulation and design of microwave, multi-device distributed autonomous circuits

Contact Info

Product

Resources

About