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All Journal International Journal of Electrical and Computer Engineering Bulletin of Electrical Engineering and Informatics Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika IJITEE (International Journal of Information Technology and Electrical Engineering) Journal of Electrical, Electronic, Information, and Communication Technology (JEEICT) Jurnal Nasional Teknik Elektro dan Teknologi Informasi Prosiding Seminar Nasional Teknik Elektro, Sistem Informasi, dan Teknik Informatika (SNESTIK)
Prapto Nugroho
Universitas Gadjah Mada
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering

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 1 
A 5.9 GHz Low Power and Wide Tuning Range CMOS Current-controlled Ring Oscillator Prapto Nugroho; Ramesh K. Pokharel; Haruichi Kanaya; Keiji Yoshida
International Journal of Electrical and Computer Engineering (IJECE) Vol 2, No 3: June 2012
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (298.703 KB)

Abstract

Designing low power, low noise, wide tuning range and small size circuit in one single chip is very challenging. This paper describe a low power, wide tuning range three-stage current-controlled ring oscillator (CCO) designed on 0.18um CMOS technology. The CCO circuit has tuning range from 251 MHz to 5.5 GHz or 183% wide. It consumes only 144 uA to 9.76mA by using 1.8V power supply. Phase noise is -104 dBc /Hz at 5.5 GHz and 4 Mhz offset frequency.  Calculated FoM is -154.4 dBc /Hz which is the best among published counterpart papers. The size of the core oscillator circuits without bonding pads is only 0.0003 mm2.DOI:http://dx.doi.org/10.11591/ijece.v2i3.229
Burg power spectral density-based characterization of Doppler blood flow sound during hemorrhoidal artery ligation Daniel Santoso; Oyas Wahyunggoro; Prapto Nugroho
Bulletin of Electrical Engineering and Informatics Vol 11, No 3: June 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v11i3.3309

Abstract

Hemorrhoidal artery ligation (HAL) has become universally accepted minimally invasive treatment of hemorrhoids disease. HAL involves precise identification of the superior rectal arteries supplying hemorrhoidal tissues using ultrasonic Doppler principles. During this process, at least there are three distinct sounds may be encountered by the surgeon. Only the pulsing Doppler sound is useful as it indicates the presence of hemorrhoidal artery. The accuracy based on traditional auscultation is commonly affected by surgeon’s hearing sensitivity and clinical experience. Therefore, automatic Doppler blood flow sound will be a great help in locating hemorrhoidal arteries. In this paper, a method based on the center frequency and kurtosis features extracted from Burg’s power spectral density (PSD) to distinguish three different types of Doppler blood flow sound signal during HAL procedure is proposed. Separability measurement was carried out using K– means clustering with the city block distance and three clusters corresponding to different sound types are successfully formed. In terms of arterial sound detection, an accuracy of 94.11% can be achieved. This result suggests that centre frequency, kurtosis, and maybe some other statistical features extracted from Burg PSD have the potential to be utilized as a means in automatic Doppler blood flow sound recognition.
IMPLEMENTASI MICROKONTROLLER UNTUK SISTEM KENDALI KECEPATAN BRUSHLESS DC MOTOR MENGGUNAKAN ALGORITMA HYBRID PID FUZZY Roedy Kristiyono; Oyas Wahyunggoro; Prapto Nugroho
Prosiding SNST Fakultas Teknik Vol 1, No 1 (2015): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 6 2015
Publisher : Prosiding SNST Fakultas Teknik

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Abstract

Motor BLDC secara luas digunakan pada banyak aplikasi industri karena mempunyai efisiensi tinggi, torsi tinggi dan volume noise yang rendah. Pengendalian kecepatan Motor BLDC merupakan suatu proses yang rumit. Tetapi kerumitan yang dilakukan sebanding dengan unjuk kerja dari Motor BLDC yang tinggi. Kendali PID konvensional terbukti mampu menunjukkan kinerja yang baik pada pengendalian dengan pembebanan tertentu pada plant. Tetapi setiap terjadi perubahan beban pada plant, kendali PID konvensional harus dilakukan set ulang parameter kp, ki dan kd untuk dapat menuju ke keadaan steady state sesuai dengan set point yang diinginkan. Tujuan penelitian ini adalah merancang peralatan kendali untuk Motor BLDC yang dapat menala parameter PID secara otomatis oleh logika fuzzy. Dalam penelitian digunakan mikrokontroler AVR RISC sebagai pusat kendali.  Sedangkan perangkat lunak digunakan untuk algoritma pemrograman kendali PID dan kendali hybrid PID fuzzy dengan bahasa C. Agar dapat menala parameter PID yang tepat secara waktu nyata, maka dibuat sistem kendali dua aras. Aras pertama menentukan parameter PID dengan mencari batas minimal dan maksimal nilai kp, ki dan kd dengan metode kurva reaksi. Aras kedua merancang sistem fuzzy agar dapat menala penguatan PID secara otomatis, kemudian memformulasikan kedalam kombinasi 49 aturan if-then fuzzy untuk mendapatkan nilai kp, ki dan kd yang tepat dari perubahan nilai error dan delta error. Pengujian perubahan set point dan perubahan beban dihasilkan karakteristik respon sistem kendali PID konvensional dengan nilai rata-rata yaitu waktu kenaikan (tr) 0.025 detik, waktu penetapan (ts) 0.1625 detik, overshoot  sebesar 15.98%. Sedangkan kendali Hybrid PID Fuzzy dihasilkan nilai rata-rata waktu kenaikan (tr) 0.0025 detik, waktu penetapan (ts) 0.057 detik, overshoot sebesar 5.42%. Kata kunci : Auto-tuning, Brushless DC Motor, Fuzzy, Pengendalian, PID
Broad-Band Noise Reduction using Least Mean Square (LMS)-Adaptive Line Enhancer (ALE) on Doppler Blood Flow Sound Signal DANIEL SANTOSO; OYAS WAHYUNGGORO; PRAPTO NUGROHO
Jurnal Elkomika Vol 10, No 1 (2022): ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektr
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v10i1.189

Abstract

ABSTRAKHaemorrhoidal artery ligation (HAL) adalah metode operasi wasir yang memiliki keunggulan rasa sakit minimal dan waktu pemulihan cepat. Prosedur HAL bergantung pada bunyi Doppler untuk menentukan letak arteri dalam liang anus. Derau yang tercampur dalam sinyal membuat dokter kesulitan mendengarkan bunyi Doppler yang menandakan letak arteri wasir. Adaptive line enhancer (ALE) dengan algoritma least mean square (LMS) digunakan dalam penelitian ini untuk mengurangi aras derau yang terkandung dalam sinyal bunyi Doppler aliran darah. Hasil simulasi menunjukkan parameter mean square error (MSE), signal to noise ratio (SNR), dan waktu eksekusi untuk berbagai orde tapis. Nilai maksimum power spectral density (PSD) sinyal yang masuk ke tapis -86 dB/Hz, kemudian turun menjadi -101 dB/Hz setelah lewat tapis. SNR tertinggi 40,03 dB didapat ketika orde tapis 16. Waktu eksekusi hampir tidak berubah meskipun orde filter dinaikkan.Kata kunci: pengurangan derau, bunyi Doppler, ALE, LMS, HAL ABSTRACTHemorrhoidal artery ligation (HAL) is one of surgical methods in treating hemorrhoids disease known for less pain and fast recovery. HAL procedure relies on the Doppler audible sound to locate arteries within rectal column. Noise interfering the signal of interest makes arteries detection becomes difficult task for the surgeon since signal and noise spectral overlaps. Adaptive line enhancer (ALE) with least mean square (LMS) algorithm is used in this study to reduce noise level contained in Doppler blood flow sound signal. The simulation results show the mean square error (MSE), signal to noise ratio (SNR), and execution time for different filter order. The maximum power spectral density (PSD) value of the noisy signal and filtered signal are -86 dB/Hz and -101 dB/Hz. respectively. The highest SNR of 40.03 dB is obtained when filter tap order is set to 16. However signal processing time remains almost unchanged as the filter tap order increased.Keywords: noise reduction, Doppler sound, ALE, LMS, HAL
Rangkaian Osilator Cincin dengan Sinyal Keluaran Quadrature untuk Aplikasi Komunikasi Nirkabel Prapto Nugroho
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 1 No 2: Mei 2012
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

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Abstract

This paper proposes a novel voltage controlled ring oscillator with quadrature output in 0.18 m CMOS technology. Interpolating inverter and sub-feedback loop is used to reduce the power consumption and increase the output frequency. It consumes only 3.3 mA from 1.8V supply voltage to oscillate at 4.4 GHz. It has wide tuning range from 0.6 GHz to 5 GHz or about 152% from center frequency. Phase noise of -103.1 dBc/Hz is achieved at 4.4 GHz carrier and 4 MHz frequency offset. Figure of Merit (FoM) is -156.1 dBc/Hz which is the best among its previous published reference papers.
Design of a Low Cost High Efficiency Multiple Output Self Oscillating Flyback Converter Yogi Sawitra; Prapto Nugroho; Eka Firmansyah; Wahyu Dewanto; Rudy Hartanto; Tiyono Tiyono; Tumiran Tumiran
IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 1, No 2 (2017): June 2017
Publisher : Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1566.858 KB) | DOI: 10.22146/ijitee.29769

Abstract

The use of some integrated circuits in an SMPS circuit are the main factor that increasing the cost. Self-oscillating feedback converter topology is a well-known circuit topology for low-cost application without using any single integrated circuit chip. In this paper, a Low Cost with high efficiency converter without any single integrated circuit component was analysed and designed. It has also multiple outputs of 3.3 V/1 A, 5 V/0.5 A, and 12 V/0.1 A so that it can be used as power supply for DVD player. Experiment results showed that it can deliver continuously output voltage as designed and a total output power of 7.3 W, with an efficiency for about 70%.
LNA Prototype at 54 MHz to 88 MHz Using Discrete Components Prapto Nugroho; Ivan Muhammad Ihsan Izetbegovic; Wahyu Dewanto
IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 4, No 1 (2020): March 2020
Publisher : Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijitee.56153

Abstract

This paper presents a design and prototyping of a Low-Noise Amplifier (LNA) for Wireless Regional Area Network (WRAN) operating in TV broadcast bands between 54 MHz – 88 MHz. The LNA design was then implemented by using discrete components. Components values was obtained by utilized DC analysis according to specifications which follows the Institute of Electrical and Electronics Engineering (IEEE) 802.22 standard on WRAN technical specifications. Simulation with 88 MHz produced S11 = -5.72 dB, S12 = -41.57 dB, S21 = 15.07 dB, S22 = -4.76 dB, Noise Figure (NF) = 3.9 dB, Input Third Order Intercept Point (IIP3) = 2.21 dBm, and power consumption of 45.39 mW. Experiments results on 88 MHz showed S11 = -6.13 dB and S21 = 0.74 dB.
Perancangan Piranti Perekam Isyarat Bioelektrik Portable berbasis ESP32 dan FreeRTOS Enas Dhuhri Kusuma; Prapto Nugroho; Wahyu Dewanto
Prosiding Seminar Nasional Teknik Elektro, Sistem Informasi, dan Teknik Informatika (SNESTIK) 2022: SNESTIK II
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (160.209 KB) | DOI: 10.31284/p.snestik.2022.2705

Abstract

Metode untuk monitor dan pengukuran isyarat elektrokardigrafi (EKG) memberikan kontribusi yang sangat besar pada penelitian biomedika, salah satu di antaranya adalah telemedika. Perkembangan telemedika memerlukan piranti monitor jarak jauh isyarat bioelektrik nirkabel dari pasien ke fasilitas medis. Aspek utama monitoring isyarat bioelektrik adalah perancangan analog front end, digitisasi isyarat bioelektrik, dan pengiriman isyarat digital. Piranti yang dipaparkan pada paper ini adalah sistem monitor EKG portabel sebagai piranti node dan penerimanya. Piranti ini merekam isyarat EKG dengan frekuensi cuplik yang konstan dan mencukupi, kemudian mengirimkan isyarat ke suatu piranti gateway yang terdedikasi. Sistem ini diimplementasikan pada mikrokontroler ESP32 dengan lingkungan FreeRTOS. Proses pengujian dan verifikasi dilakukan dengan pembangkit isyarat EKG komersial dan hasilnya dibandingkan dengan hasil pembacaan piranti monitor EKG komersial.
Optimize BER Offset QPSK Baseband Modulation-Demodulation featuring AWGN and OFDM Mohammad Hakim Adhiguna; Prapto Nugroho; Sigit Basuki Wibowo
Journal of Electrical, Electronic, Information, and Communication Technology Vol 4, No 2 (2022): JOURNAL OF ELECTRICAL, ELECTRONIC, INFORMATION, AND COMMUNICATION TECHNOLOGY
Publisher : Universitas Sebelas Maret (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jeeict.4.2.65820

Abstract

In communication system, being fastest not always the best option because of much great error probabilities. Complex architecture also cost high for the component maintenances. An optimal OQPSK modem is provide for friendly use and affordable model in academic purposes. The proposed method is moderate way with twice data size than the conventional method, but error calculation is exactly constant. Good and optimal BER measurements from simulated binary data useful for academic learning purpose.
Co-Authors Daniel Santoso Eka Firmansyah Enas Dhuhri Kusuma Haruichi Kanaya Ivan Muhammad Ihsan Izetbegovic Keiji Yoshida Mohammad Hakim Adhiguna Oyas Wahyunggoro Ramesh K. Pokharel Roedy Kristiyono Rudy Hartanto Sigit Basuki Wibowo Tiyono Tumiran Wahyu Dewanto Yogi Sawitra