A 38-GHz push-push oscillator based on 25-GHz f/sub T/ BJT's

Sinnesbichler, F.X.; Geltinger, H.; Olbrich, G.R.

doi:10.1109/75.763244

Cited by 40 publications

(7 citation statements)

References 6 publications

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“…In the particular case of a push-push oscillator, the injection of an external signal requires a careful selection of the input node or nodes. Because of the system symmetry, virtual grounds at the fundamental oscillation frequency exist in the circuit [1]. At these particular nodes, the injection of a signal with frequency close to the fundamental oscillation frequency, will have very limited effect on the circuit operation.…”

Section: Injection-locked Push-push Oscillatormentioning

confidence: 99%

Harmonic-balance design and analysis of an injection-locked push-push oscillator

Pontón

Blanco-Fernández

Suárez

et al. 2008

2008 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits

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Harmonic balance analysis and design of an injectionlocked push-push oscillator is presented in this paper. Taking advantage of the inherent operation of the push-push oscillators, low-power injection signals can be amplified and their frequency doubled. A rigorous comparison between time-and frequencydomain simulations is presented to validate the design of the proposed circuit. The startup of the different oscillation modes that coexist for the same values of the circuit components and parameters is also investigated. Phase noise and stability analysis have also been carried out to evaluate the performance of the circuit. A 10 GHz injection-locked push-push oscillator has been used as demonstrator with good agreement between the different simulations and measurements.

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Section: Injection-locked Push-push Oscillatormentioning

confidence: 99%

Harmonic-balance design and analysis of an injection-locked push-push oscillator

Pontón

Blanco-Fernández

Suárez

et al. 2008

2008 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits

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“…Suppressions of the fundamental signal and the third harmonic signal are -20 dBc and -24 dBc, respectively. The imperfect suppressions may be attributed to fabrication errors and slight differences in the characteristics of two active devices [4]. In the asymmetrical push-push oscillator, the frequency and the output power are 5.77 GHz and 1.9 dBm.…”

Section: Resultsmentioning

confidence: 99%

Design of push-push oscillators for reducing 1/f noise upconversion

Choi

Mortazawi

2005

IEEE MTT-S International Microwave Symposium Digest, 2005.

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In this paper the design of push-push oscillators with symmetrical waveforms is proposed for low phase noise. The presence of the large second harmonic components may degrade the waveform symmetry of the oscillation waveforms in two suboscillators, thus leading to the significant 1 / f noise upconversion. Therefore, to minimize 1 / f noise upconversion in push-push oscillators, the phases of Fourier coefficients of all harmonics need to be equal. The experimental results show that a 15 dB phase noise improvement at 100 kHz offset frequency can be obtained by satisfying the waveform symmetry condition.Index Terms -Microwave oscillators, FET oscillators, phase noise, oscillator noise.

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“…In the past, most of the high frequency oscillators are based on the conventional fundamental frequency oscillator approach, which has the drawback of insufficient device gain as frequency goes higher, such as millimeter-wave frequency range. To overcome the disadvantage, push-push oscillators comprising two fundamental oscillators, whose fundamental output signals are out-of-phase to each other, have been proposed [1]- [5]. In a push-push oscillator, two out-of-phase fundamental signals cancel out themselves and the second harmonic signals are combined in phase.…”

Section: Introductionmentioning

confidence: 99%