scholarly journals Perancangan Alat Karakterisasi Dioda dengan ESP32 dan Rangkaian Op-Amp LM358 Berbasis Android

2021 ◽  
Vol 13 (1) ◽  
pp. 22-29
Author(s):  
Ari Bawono Putranto ◽  
Zaenul Muhlisin ◽  
Amatul Lutfiah ◽  
Fakhruddin Mangkusasmito ◽  
Megarini Hersaputri
Keyword(s):  
Op Amp

Pada penelitian ini telah berhasil membuat sebuah alat uji karakterisasi bias maju dioda menggunakan ADC dan DAC internal mikrokontroler ESP32. Tegangan keluaran DAC ditambahkan dengan rangkaian penguat op-amp tak membalik LM358 sebesar 2 kali. Sehingga hasil pengujian tegangan keluaran DAC dapat mencapai nilai maksimum 6,3 volt sebagai sumber catu daya DC variabel rangkaian uji karakteristik bias maju dioda. Pengujian karakterisasi bias maju dioda dilakukan melalui antarmuka perangkat smartphone android dengan jaringan WiFi dan diperoleh kurva grafik karakterisasi bias maju yang memiliki nilai dan bentuk hampir sama dengan pengujian secara manual. Pengujian karakterisasi bias maju dioda menggunakan aplikasi ini lebih cepat daripada menggunakan pengukuran secara manual dengan alat ukur multimeter. Berdasarkan pengujian yang dilakukan menggunakan aplikasi smartphone android sebanyak 3 kali diperoleh rata-rata waktu sebesar 30 detik, sedangkan secara manual menggunakan alat ukur diperoleh rata-rata waktu sebesar 657,7 detik.

Noise-Coupled ΔΣAD Modulator with Shared OP-Amp

2009 ◽  
Vol 129 (12) ◽  
pp. 2167-2173 ◽  
Author(s):  
Hao San ◽  
Hajime Konagaya ◽  
Takafumi Yamada ◽  
Haijun Lin ◽  
Haruo Kobayashi ◽  
...  
Keyword(s):  
Op Amp

Improvement of Gain Accuracy and CMRR of Low Power Instrumentation Amplifier Using High Gain Operational Amplifiers

2020 ◽  
Vol 12 (3) ◽  
pp. 168-174
Author(s):  
Rashmi Sahu ◽  
Maitraiyee Konar ◽  
Sudip Kundu
Keyword(s):  
Low Power ◽  
Building Blocks ◽  
High Gain ◽  
The Other ◽  
Operational Amplifiers ◽  
Instrumentation Amplifier ◽  
Biomedical Signals ◽  
Op Amp ◽  
Op Amps ◽  
Multi Stage

Background: Sensing of biomedical signals is crucial for monitoring of various health conditions. These signals have a very low amplitude (in μV) and a small frequency range (<500 Hz). In the presence of various common-mode interferences, biomedical signals are difficult to detect. Instrumentation amplifiers (INAs) are usually preferred to detect these signals due to their high commonmode rejection ratio (CMRR). Gain accuracy and CMRR are two important parameters associated with any INA. This article, therefore, focuses on the improvement of the gain accuracy and CMRR of a low power INA topology. Objective: The objective of this article is to achieve high gain accuracy and CMRR of low power INA by having high gain operational amplifiers (Op-Amps), which are the building blocks of the INAs. Methods: For the implementation of the Op-Amps and the INAs, the Cadence Virtuoso tool was used. All the designs and implementation were realized in 0.18 μm CMOS technology. Results: Three different Op-Amp topologies namely single-stage differential Op-Amp, folded cascode Op-Amp, and multi-stage Op-Amp were implemented. Using these Op-Amp topologies separately, three Op-Amp-based INAs were realized and compared. The INA designed using the high gain multistage Op-Amp topology of low-frequency gain of 123.89 dB achieves a CMRR of 164.1 dB, with the INA’s gain accuracy as good as 99%, which is the best when compared to the other two INAs realized using the other two Op-Amp topologies implemented. Conclusion: Using very high gain Op-Amps as the building blocks of the INA improves the gain accuracy of the INA and enhances the CMRR of the INA. The three Op-Amp-based INA designed with the multi-stage Op-Amps shows state-of-the-art characteristics as its gain accuracy is 99% and CMRR is as high as 164.1 dB. The power consumed by this INA is 29.25 μW by operating on a power supply of ±0.9V. This makes this INA highly suitable for low power measurement applications.

scholarly journals Characteristics of CdS and photo-transistor as photo sensor on the sensor unit (SU-6804) and OP amp unit (OU-6801)

2021 ◽  
Author(s):  
Fasya Nabilah ◽  
Ryaas Mishbachul Munir ◽  
Annila Firdaus ◽  
Vissella Zulia Lestari ◽  
Aldi Destia Lesmana ◽  
...  
Keyword(s):  
Sensor Unit ◽  
Op Amp ◽  
Photo Sensor

scholarly journals Implementation of Power-Efficient Class AB Miller Amplifiers Using Resistive Local Common-Mode Feedback

2021 ◽  
Vol 11 (3) ◽  
pp. 31
Author(s):  
Anindita Paul ◽  
Mario Renteria-Pinon ◽  
Jaime Ramirez-Angulo ◽  
Ricardo Bolaños-Pérez ◽  
Héctor Vázquez-Leal ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Figure Of Merit ◽  
Small Signal ◽  
Common Mode ◽  
Power Efficient ◽  
Class Ab ◽  
Op Amp ◽  
Class A ◽  
Wide Range ◽  
Quiescent Current

An approach to implement single-ended power-efficient static class-AB Miller op-amps with symmetrical and significantly enhanced slew-rate and accurately controlled output quiescent current is introduced. The proposed op-amp can drive a wide range of resistive and capacitive loads. The output positive and negative currents can be much higher than the total op-amp quiescent current. The enhanced performance is achieved by utilizing a simple low-power auxiliary amplifier with resistive local common-mode feedback that increases the quiescent power dissipation by less than 10%. The proposed class AB op-amp is characterized by significantly enhanced large-signal dynamic, static current efficiency, and small-signal figures of merits. The dynamic current efficiency is 15.6 higher, the static current efficiency is 8.9 times higher, and the small-signal figure of merit is 2.3 times higher than the conventional class-A op-amp. A global figure of merit that determines an op-amp’s ultimate speed is 6.33 times higher than the conventional class A op-amp.

Low voltage and low frequency current mirror using a two-MOS subthreshold OP-Amp

1996 ◽  
Vol 32 (7) ◽  
pp. 605 ◽  
Author(s):  
K. Tanno ◽  
O. Ishizuka ◽  
Z. Tang
Keyword(s):  
Low Voltage ◽  
Low Frequency ◽  
Current Mirror ◽  
Op Amp ◽  
Frequency Current
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