Microwave oscillator design with power prediction

Lam, V.M.T.; Yip, Peter C. L.

doi:10.1049/el:19910986

Cited by 9 publications

(4 citation statements)

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“…An analytical approach to the design of microwave oscillators with output power prediction was documented [14]. This design method is mainly concerned with the calculation of the oscillator's network elements using small-signal RF device two-port parameters as the starting point.…”

Section: Related Workmentioning

confidence: 99%

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Effect of Load Impedance on the Performance of Microwave Negative Resistance Oscillators

Al-Raie¹,

Jasim²

2021

Al-Rafidain J Sci

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In microwave negative resistance oscillators, the RF transistor presents impedance with a negative real part at either of its input or output ports. According to the conventional theory of microwave negative resistance oscillators, in order to sustain oscillation and optimize the output power of the circuit, the magnitude of the negative real part of the input/output impedance should be maximized. This paper discusses the effect of the circuit’s load impedance on the input negative resistance and other oscillator performance characteristics in common base microwave oscillators. New closed-form relations for the optimum load impedance that maximizes the magnitude of the input negative resistance have been derived analytically in terms of the Z-parameters of the RF transistor. Furthermore, nonlinear CAD simulation is carried out to show the deviation of the large-signal optimum load impedance from its small-signal value. It has been shown also that the optimum load impedance for maximum negative input resistance differs considerably from its value required for maximum output power under large-signal conditions. A 1.8 GHz oscillator circuit has been designed and simulated using a typical SiGe hetero-junction bipolar transistor (HBT) to verify the proposed approach of analysis.

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Section: Related Workmentioning

confidence: 99%

“…In Figure (14), the simulations are repeated for P in = 3 dBm. It is noticed that the optimum load resistance is increased, while the magnitude of the negative input resistance is significantly decreased.…”

Section: Simulation Of Load Impedance Variationsmentioning

confidence: 99%

Effect of Load Impedance on the Performance of Microwave Negative Resistance Oscillators

Al-Raie¹,

Jasim²

2021

Al-Rafidain J Sci

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“…By fmding the optimal embedding network of the oscillator at the fundamental frequency, the output power can be maximized [4], [5]. However, a poor selection ofharmonic load impedances could degrade the performance ofthe oscillator.…”

Section: Introductionmentioning

confidence: 99%

Negative input resistance and real-time active load-pull measurements of a 2.5GHz oscillator using a LSNA

Suh

Doo

Roblin

et al. 2007

2007 69th ARFTG Conference

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A large-signal measurement-based methodology to design oscillators using the Kurokawa theory is presented in this paper. Measurements of the negative input resistance and device line of a 2.5GHz HEMT oscillator versus frequency and power, and its optimization using real-time active load-pull (RTALP) for the 2 nd and 3 rd harmonics are performed with a large signal network analyzer (LSNA). As a result, the maximum output power of the oscillator is increased from 31.0mW to 38.8mW. Finally self-oscillation is verified using a load tuner to yield an output power and frequency of oscillation in reasonable agreement with the Kurokawa analysis.

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“…To maximize the output power, it is required to correctly characterize the active device by small-or large-signal linear parameters or nonlinear device models. A number of oscillator design methods have been reported that use large-signal -or -parameters obtained from measurement [1]- [4] or modified small-signal -parameters [3], [5]. These quasi-nonlinear techniques are simple, but their accuracies are valid only when the harmonic components are negligible or small enough compared with the fundamental frequency component.…”

Section: Introductionmentioning

confidence: 99%

High-efficiency harmonic loaded oscillator with low bias using a nonlinear design approach

Lee¹,

Nam

et al. 1999

IEEE Trans. Microwave Theory Techn.

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Microwave oscillator design with power prediction

Cited by 9 publications

References 0 publications

Effect of Load Impedance on the Performance of Microwave Negative Resistance Oscillators

Effect of Load Impedance on the Performance of Microwave Negative Resistance Oscillators

Negative input resistance and real-time active load-pull measurements of a 2.5GHz oscillator using a LSNA

High-efficiency harmonic loaded oscillator with low bias using a nonlinear design approach

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