Low noise low cost ultra wideband N-push VCO

Rohde, Ulrich L.; Poddar, Ajay K.; Schoepf, Juergen; Rebel, R.; Patel, PP

doi:10.1109/mwsym.2005.1516884

Cited by 39 publications

(10 citation statements)

References 2 publications

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“…The dc subsystem contains a set of real equations, while the first harmonic subsystem is formed by complex equations. In the presence of the noise sources, the steady-state system (11) is perturbed in the following way: (12) In (12), the carrier modulation approach has been considered for the perturbation analysis [32]. The time-varying components , , and represent the perturbation components of the dc and first harmonic amplitudes, the first harmonic phases, and the oscillation frequency, respectively.…”

Section: A Semianalytical Formulationmentioning

confidence: 99%

“…Performing a first-order Taylor expansion of the (12) in the perturbation components, and neglecting higher order terms, the following algebraic system is obtained: (13) where the matrices are defined as (14) Equation (13) can be written in a more compact way as (15) where contains all the perturbation components. Due to the introduction of the frequency perturbation component , system (15) contains equations with unknowns.…”

Section: A Semianalytical Formulationmentioning

confidence: 99%

See 1 more Smart Citation

Stability Analysis of Oscillation Modes in Quadruple-Push and Rucker's Oscillators

Ramírez¹,

Pontón²,

Sancho³

et al. 2008

IEEE Trans. Microwave Theory Techn.

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Oscillator systems composed by sub-oscillators coupled through a symmetric linear network enable the combination of output power at the first or th harmonic component of the oscillation frequency of each sub-oscillator. However, they have the drawback of a possible coexistence of different oscillation modes, which limits their practical application. This paper presents an in-depth stability analysis of coexisting steady-state solutions in Rucker's oscillator and -push oscillators. Criteria are provided to avoid undesired oscillation modes. The coupled system is described by means of a semianalytical formulation based on numerical models of the active subcircuits, extracted from harmonic-balance (HB) simulations. Each active subcircuit is composed by the transistor(s), feedback elements, and termination load. The use of the HB numerical models allows a realistic prediction of the behavior of the globally coupled oscillator. Alternatively, a graphical technique is provided to obtain the different oscillation modes using full HB simulations. The perturbation of the reduced-order nonlinear system enables the stability and phase-noise analysis of the steady-state oscillatory solutions. In the derived formulation for phase-noise analysis, both flicker-and white-noise perturbations are considered. The different techniques have been applied to a Rucker's oscillator at 3.9 GHz and a quadruple-push oscillator at 15.6 GHz.

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Section: A Semianalytical Formulationmentioning

confidence: 99%

Section: A Semianalytical Formulationmentioning

confidence: 99%

Stability Analysis of Oscillation Modes in Quadruple-Push and Rucker's Oscillators

Ramírez¹,

Pontón²,

Sancho³

et al. 2008

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…Therefore, by analyzing the noise behaviors at near and far carrier frequency offset due to the device scaling, the designer can improve noise performance by optimizing conduction angle for a given size of the device [2]- [5]. The VCO design approach based on device scaling demonstrated in this work ( Figure 3) enables power-efficient (5V, 20mA), extended frequency operation, lower phase noise performance with minimum 5dBm power output over the band (2)(3)(4)(5)(6), which is attractive for present and future generation wireless applications.…”

Section: Scaled Device Coupled Resonator Rf Oscillator (2-6 Ghz)mentioning

confidence: 99%

Minimization of phase noise in scaled device coupled mode oscillators

Rohde

Poddar

2007

2007 6th International Conference on Antenna Theory and Techniques

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The performance of the electronic system strongly depends on the speed of devices, and device scaling has driven this momentum towards achieving faster speed and high level of integration. This paper describes the impact of phase noise in scaled SiGe HBTs coupled mode oscillators topology, which has recently emerged as a strong contender for RF and mixed signal applications. The relative contribution of the broadband (thermal and shot noise) and low frequency ( 1/ f noise) noise sources are examined with respect to the device scaling. A method of minimizing the phase noise with respect to the device scaling is discussed, and demonstrated for planar coupled resonators based VCO. The circuit topology is not limited to these frequencies, and easily amenable for integration in MMIC form.

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“…Due to the promising characteristics of low insertion loss, broadband operation, high quality factor, and high isolation, RF MEMS are of great interest for wireless applications, particularly in reconfigurable RF/microwave systems, such as tunable VCOs (voltage controlled oscillators), antennas, filters, switches, phase shifters, and impedance tuners [1][2][3][4].…”

Section: Rf Mems Device and Componentsmentioning

confidence: 99%

“…Similarly, transient current measured after the voltage pulse is removed is due to mainly trap discharging current. The injected charge densities in the dielectric can be described by [7] Q Z E Qi[Iexp(-ton I -r,)] exp(-tOff Td) (1 ) where Q, is the steady-state charge density of the th trap, c, and Td, are the charging and discharging time constants of the th trap, to., and toff are the ON and OFF times of the switch corresponding to the charging and discharging times.…”

Section: B Dielectric Charging Effectsmentioning

confidence: 99%

MEMS Enabled Signal Source For Wireless Communication Systems

Rohde

Poddar

2006

2006 3rd International Symposium on Wireless Communication Systems

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The application of RF MEMS (Radio Frequency Micro Electro Mechanical System) is on the verge of revolutionized wireless communications. RF MEMS offers a class of new devices and components that exhibit superior RF performance relative to conventional semiconductor devices, and also electronically reconfigurable. The current diversities of available services comes up with the necessity of multi-standards transreceiver operating in several frequency bands, therefore, present paper describes the overview of the RF MEMS based components and approach for configurable signal source (VCO) and antennas for third and later generation of wireless communication systems.

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Low noise low cost ultra wideband N-push VCO

Cited by 39 publications

References 2 publications

Stability Analysis of Oscillation Modes in Quadruple-Push and Rucker's Oscillators

Stability Analysis of Oscillation Modes in Quadruple-Push and Rucker's Oscillators

Minimization of phase noise in scaled device coupled mode oscillators

MEMS Enabled Signal Source For Wireless Communication Systems

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