A method to reduce the phase noise in bipolar transistor circuits

Takagi, Keiji; Serikawa, Seiichi; Doi, Tetsuya

doi:10.1109/82.735363

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…For long pulses the minimum flicker shifts to a demodulation angle near 45° as a result of the smaller imbalance of +( and '( . Similar AM-PM correlations have been found in RF oscillators [45,46], diodes [47], and transistors [48], but to our knowledge, this is the first demonstration of AM-PM flicker correlation in photodiodes. While the origin of this correlation is not known, correlated AM-PM is consistent with the idea that a single baseband noise source will modulate both the amplitude and phase of a photonically generated microwave.…”

Section: Correlation Of Amplitude and Phase Flicker Noisesupporting

confidence: 83%

Reduction of Flicker Phase Noise in High-Speed Photodetectors Under Ultrashort Pulse Illumination

et al. 2021

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High-fidelity photodetection enables the transfer of the low noise inherent to optical oscillators to the microwave domain. However, when photodetecting optical signals of the highest timing stability, photodiode flicker (1/f) noise can dominate the resulting timing jitter at timescales longer than ~1 ms. With the goal of improving femtosecond-level timing fidelity when transferring from the optical to microwave domain, we vary the duty cycle of a train of optical pulses and show that the photodetector flicker phase noise on a photonically generated 1 GHz microwave signal can be reduced by ~10 dB under ultrashort pulse illumination, reaching as low as -140/f dBc/Hz. In addition, a strong correlation between amplitude and phase flicker noise is found, implying a single baseband noise source can modulate both quadratures of the microwave carrier. These findings expand the limits of the ultimate timing stability that can be transferred from optics to electronics.

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Section: Correlation Of Amplitude and Phase Flicker Noisesupporting

confidence: 83%

Reduction of Flicker Phase Noise in High-Speed Photodetectors Under Ultrashort Pulse Illumination

et al. 2021

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“…The model reduces the problem of determining the phase noise performance of an amplifier to some simple circuit analysis. For BJT amplifiers, the problem has been studied in relatively few papers [3], [5], and [7]. In contrast to previous work [3], the proposed model does not assume that the fluctuations in the circuit parameters, which in turn cause fluctuations in the gain and phase, are independent and uncorrelated processes.…”

Section: Introductionmentioning

confidence: 99%

A model for phase noise generation in amplifiers

Tomlin

Fynn

Cantoni

2001

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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In this paper, a model is presented for predicting the phase modulation (PM) and amplitude modulation (AM) noise in bipolar junction transistor (BJT) amplifiers. The model correctly predicts the dependence of phase noise on the signal frequency (at a particular carrier offset frequency), explains the noise shaping of the phase noise about the signal frequency, and shows the functional dependence on the transistor parameters and the circuit parameters. Experimental studies on common emitter (CE) amplifiers have been used to validate the PM noise model at carrier frequencies between 10 and 100 MHz.

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