Gunawan Wibisono

Concurrent multiband low noise amplifier with multisection impedance transformer

In this paper, multiband low noise amplifier (LNA) with multi-section impedance transformer (MIT) as impedance matching is designed, fabricated and evaluated. MIT is used as input and output impedance matching because MIT has higher stability, large Q factor, and low noise than lumped component. MIT is easy to fabricate and measure. The aim of the research is to design multiband LNA with MIT at center frequencies located at 0.95 GHz for GSM, 1.85 GHz for WCDMA and 2.65 GHz for LTE. Designed and evaluated of the proposed multiband LNA with MIT is done by using advanced desain system (ADS). It shown from the simulated results that performances of the proposed LNA at center frequency of 0.950 GHz has return loss, S11 = -23.541 dB, insertion loss, S21 = 18.911 dB, noise figure, NF = 1.475 dB, VSWR = 1.143, and FoM = 8.38, respectively. At center frequency of 1.85 GHz, the proposed LNA has S11 = -23.771 dB, S21 = 12.858 dB, NF = 1.988 dB, VSWR = 1.139, and FoM = 2.616. At center frequency 2.65 GHz, the proposed LNA has S11 = -23.521 dB, S21 = 10.180 dB, NF = 2.776 dB, VSWR = 1.143, and FoM = 1.152. The center frequencies of fabricated proposed multiband LNA with MIT are shifted in average to 5-10 MHz lead to simulation results, and the performances of the fabricated of the proposed LNA with MIT are degraded about 7-10% by using Monte-Carlo Yield Analysis.

Noise modeling of source inductive degeneration low noise amplifier in 0.18-µm CMOS technology

This paper presents a mathematical modeling of noise performance in source inductive degeneration topology which widely used in narrow band amplifier. The proposed model is conducted by utilizing a small-signal MOSFET model to generate the effective transconductance of circuits. The performance of noise figure can be preserved by selecting the device width while preserving a stable bias voltages and maintaining the device length unchanged. Using the mathematical model, a low noise amplifier is designed and obtain the noise figure of 2.5-dB, an remarkable figure of merit among reported LNAs in 0.18-μm CMOS technology.

RCPC-Encoded V-BLAST MIMO with MMSE-Based Detection

A Rate-Compatible Punctured Convolutional (RCPC)-encoded Vertical Bell Laboratories Layered Space-Time (V-BLAST) MIMO system to provide a robust wireless communication link is proposed. The V-BLAST detection is based on Minimum Mean-Squared Error (MMSE) criterion, to alleviate the noise enhancement commonly found in the original V-BLAST scheme based on Zero Forcing criterion. Different code rates and transmit powers are allocated to data streams emitted from the multiple transmit antennas, according to the attenuation levels of the subchannels. This scheme is efficient in terms of transmit power and bandwidth usage, as the data stream entering a destructive subchannel is given low transmit power and high code rate. Simulations show that the proposed system can attain good performance at a reasonably low Eb/No.

Design and implementation of smart wireless street lighting system with ad-hoc network configuration

In this research, a smart wireless street lighting system (SWSL) based on wireless communication using ZigBee configuration is designed, implemented, and analyzed. The proposed SWSL system which is equipped with sensors (light sensor, motion sensor, current and voltage sensor), time readers and the microcontroller so that the system is able to regulate its function automatically according to the time and environmental conditions. The SWSL communication system is using ad-hoc network configuration to transmit the data information of each point of lights to the server. Ad-hoc network configuration makes the system more flexible because each node can communicate with each other directly without having to go through an access point. In addition, this system also uses LED lights and apply on-grid technology that uses the energy of sunlight as its primary power source, so it is able to save on energy consumption. It is shown from the results, the system has been able to work in accordance with designed algorithms (resources switching, work function of light and sensor, and data communication). On data communications testing for transmitting data from router node to coordinator node, is obtained data reception success rate of 82.085%. Then, from the results of the calculating simulation of the efficiency of the system obtained the total power usage of SWSL per year only amounted to 59.09 KWh / lamp. Therefore, SWSL system is much more efficient in terms of energy consumption compared to existing street lighting system.

Design of dielectric resonators oscillator for mobile WiMAX at 2,3 GHz with additional coupling λ/4

Oscillator is the source of energy for all microwave communication systems. In this research, oscillator using dielectric resonator oscillator (DRO) will be designed. Comparing to other types of oscillators, DRO has a bigger value Q factor. Designed DRO is used as the carrier for the mobile WiMAX 802.16e at frequency 2,3 GHz. The dielectric resonator Trans-Tech 8500 Series Temperature Stable will be used. To obtain a high power fundamental, it is proposed to use an additional coupling λ/4 and double-stub as matching for reducing the harmonic power. Meanwhile, to obtain low phase noise, BFR 380T BJT low-phase noise with the bias of Vcc = 5 V, Vce = 3 V, and Ic = 40 mA is used. DRO is simulated using ADS software. The phase noise is −144 dBc / Hz at 10 kHz frequency carrier with a value of Q factor is 7316. The output power at the fundamental frequency is 13 dBm and second harmonic power is −40 dBm. A Monte-Carlo Yield Analysis simulation is used to simulate the performances varied with all the variation of tolerance. It is shown from Monte-Carlo-Yield Analysis simulation, DRO with an additional coupling λ/4 producing variations as same as specification with an average percentage is 84.5%. It is also shown from the results that the designed DRO with coupling λ/4 is better than DRO without additional coupling λ/4 with single-stub matching.

Triple band bandpass filter with cascade tri section stepped impedance resonator

In this paper, triple band bandpass filter (BPF) using cascade tri section stepped impedance resonator (TSSIR) which can operate at 900 MHz, 1800 MHz and 2600 MHz simultaneously, is proposed, designed, fabricated and evaluated. The cascade TSSIR BPF is proposed as enhancement of the TSSIR in order to improve the stopband rejection response of the TSSIR. The implementation of the cascade TSSIR is using two TSSIRs which are coupling each other in the third resonator and the input and output ports are connected to the first resonator. Design and simulation of the proposed BPF are using Advanced Design System (ADS). The proposed BPF using cascade TSSIR is fabricated on the substrate FR4 with dielectric permittivity is 4.3, the substrate thickness is 1.6 mm, and loss tangent is 0.0017. The performance parameters of the proposed BPF are characterized by insertion loss, return loss, voltage standing wave ratio (VSWR), and group delay. The performances of the simulated results are compared to that of the fabricated results of the proposed BPF. It is shown from the results that the performance of both simulated and fabricated results are satisfied to design specification and close agreement with each other.

Design of Quad-Band Bandpass Filter Lumped-Element Using Shunt Resonator and Independent Transmission Zero

The return loss and VSWR of the fabricated quadband BPF are satisfied to the design specifications.

Design of Power amplifier for Radio-Frequency Identification application on 13.56 MHz

Radio-Frequency Identification (RFID) has become a technology segment that growth rapidly in data collecting industry and automatic identification. One of the most important part of RFID system is power amplifier that enable power transfer between reader and transponder for identification purpose. This research is proposed power amplifier class E for RFID application at frequency of 13.56 MHz. It is shown from the results that the proposed power amplifier had a very good performances on return loss both on input and output, gain, stability, and efficiency.

Design of concurrent multiband inductive degeneration low noise amplifier with LC resonator

In this research, the concurrent multiband LNA that works at four frequency centers of 950 MHz, 1.85 GHz, 2.35 GHz, and 2.65 GHz will be designed and analyzed. The multiband LNA uses transistor HJ-FET NE3210S01 in cascode structure with self bias and inductive degeneration topology with resonator LC. The performances of multiband LNA are simulated by Advance Design System (ADS). It is shown from the simulation results that, at four frequency centers of 950 MHz, 1.85 GHz, 2.35 GHz, and 2.65 GHz, the S21 achieves 21.77 dB, 17.88 dB, 16.71 dB, and 15.85 dB respectively, the S11 achieves -23.23 dB, -20.46 dB, -17.93 dB, and -19.69 dB respectively, the NF achieves 0.73 dB, 0.69 dB, 0.68 dB and 0.75 dB respectively.

Performance analysis of RCPC V-BLAST MIMO using equivalent convolutional codes

We propose a Vertical Bell Laboratories Layered Space-Time (V-BLAST) MIMO complemented with Rate-Compatible Convolutional (RCPC) codes with Zero Forcing (ZF) and Minimum Mean Squared Error (MMSE)-based detection, as a way to attain high-capacity and highly reliable wireless system. The analytical BER of the system is presented and numerically analyzed. The system performance is analyzed in Nakagami-m fading channel, as it is adaptable to various signal statistics and covers a wide range of fading models. Equivalent convolutional code is used to mitigate the complexity arising in the calculations of the RCPC codes parameters. Results show that the use of highrate code allows for bandwidth efficiency while keeping the performance degradation at a minimum level not exceeding 1 dB. It is also shown that the proposed system is able to yield good performance even at the minimum number of antennas.