A low power and low noise preamplifier circuit for hearing aid devices

Ryoo, Kwangki; Chilukuri, Manu; Jung, Sungyong

doi:10.1109/dcas.2016.7791128

Cited by 9 publications

(3 citation statements)

References 3 publications

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“…The noises are of white spectrum because samplings of each noise output are independent over time. An evidence that the noises originate from the air flows is that the mic noise output measured in a vacuum container is significantly lower than that measured in normal air [13].…”

Section: Internal Noises Of Dmsmentioning

confidence: 97%

“…When a signal is generated between the diaphragm and back-plate, it is delivered to gate of a field effect transistor (FET) in IC, which has a very high input impedance and low output impedance. The IC amplifier has an extremely wide, flat frequency response and very low noise [13]. Thus, the frequency response of an electret mic is dominated by the electret sensor response.…”

Section: Internal Noises Of Dmsmentioning

confidence: 99%

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Benefits and Limitations of Common Directional Microphones in Real-World Sounds

Zhang¹

2018

CMR

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We present extensive experimental data to objectively evaluate the benefits and limitations of common directional microphones in real-world sound fields. The microphones include a conventional directional microphone(DM), a balanced DM, etc., plus the Omni microphone (mic) as a benchmark. The evaluation focuses on noise outputs, signal-to-noise ratios(S/Ns) and distortions; the real-world sounds include male voices, female voices, babble noises, white noises and talking interferences. Each type of noises is at 4 or 5 levels, from 30 to 70 dB SPL, at 10 dB step, and each talking interference is at 3 levels: 50, 60 and 70 dB SPL. The research methods include analytically deriving sensitivity-gains, statistically calculating the three mics' outputs, experimentally viewing waveforms and spectra, and using large-sample wave files for a high confidence level. According to the experimental results, this paper concludes that 1) for a conversation in a quiet field, in soft or low noise field, the common DMs achieve comfortable S/Ns: 7 to 33 dB, similar to what the Omni mic does; 2) for a conversation in low, competing or strong talking interference fields, the common DMs achieve about 16 dB better S/N than the Omni mic does; 3) for a conversation in competing or strong surrounding noise field, the common DMs do not achieve beneficial S/N to understand speech; the common DMs' noises are close to the Omni mic noise; 4) in various experiments, the balanced DM preserve speech fidelity well as the Omni mic does, while the conventional DM does poorly. This paper further introduces the Simulink experimental manipulations, such as digital FIR filters' design, stereo channels' wave files creation, etc., in the Appendix.

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Section: Internal Noises Of Dmsmentioning

confidence: 97%

Section: Internal Noises Of Dmsmentioning

confidence: 99%

Benefits and Limitations of Common Directional Microphones in Real-World Sounds

Zhang¹

2018

CMR

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“…RELATED WORK Many conducted research through the last decades has led to many advances in the medical imaging field. All design trends head towards reducing channel length in FET to enhance image quality [19]- [22] and thus it is going toward more FET shrinking, this trend proves that it is very powerful and efficient in terms of reducing ENC ratio and improving image quality.…”

mentioning

confidence: 99%

An efficient design of 45-nm CMOS low-noise charge sensitive amplifier for wireless receivers

Almalkawi

Al-Bqerat²,

Itradat

et al. 2022

IJECE

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<p>Amplifiers are widely used in signal receiving circuits, such as antennas, medical imaging, wireless devices and many other applications. However, one of the most challenging problems when building an amplifier circuit is the noise, since it affects the quality of the intended received signal in most wireless applications. Therefore, a preamplifier is usually placed close to the main sensor to reduce the effects of interferences and to amplify the received signal without degrading the signal-to-noise ratio. Although different designs have been optimized and tested in the literature, all of them are using larger than 100 nm technologies which have led to a modest performance in terms of equivalent noise charge (ENC), gain, power consumption, and response time. In contrast, we consider in this paper a new amplifier design technology trend and move towards sub 100 nm to enhance its performance. In this work, we use a pre-well-known design of a preamplifier circuit and rebuild it using 45 nm CMOS technology, which is made for the first time in such circuits. Performance evaluation shows that our proposed scaling technology, compared with other scaling technology, extremely reduces ENC of the circuit by more than 95%. The noise spectral density and time resolution are also reduced by 25% and 95% respectively. In addition, power consumption is decreased due to the reduced channel length by 90%. As a result, all of those enhancements make our proposed circuit more suitable for medical and wireless devices.</p>

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