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This work proposes a stabilization and noise suppression method for the angle velocity sensor integrated readout circuit using additional adaptive feedback. This feedback circuit senses corner frequency of the input signal and adjusts readout bandwidth and output noise in accordance with this corner frequency. Model of sensor and readout circuit was developed in order to estimate dynamic and noise...
The article presents the results of the design of GaN phase shifter for MIMO-based antennas. The optimization and simulation for each operating frequency 0.1–31.5 GHz was performed along with simulation of effect of capacitance mismatch on phase shifter parameters. The phase shifter is designed as a switchable high-pass filter that provides a 90° phase shift with minimum insertion losses at the operating...
This article presents the design and analysis for a flexible antenna prototype. The polyimide-based flexible antenna was designed for the 5 GHz 802.11 standard. Worst-case scenario analysis with technological variables such as substrate thickness, loss tangent, relative dielectric constant, metal layer thickness, and configuration was used to prepare an adaptive process-independent technique for control...
The paper describes challenges and proposed guidelines for design of optimal layout solution of transistors and interconnections for GaN transistors in terms of providing best RF and SI parameters. For frequencies up to 60 GHz GaN transistors as a part of MMIC provide power density to the extent of 10 W/mm, but thorough choice of technologies and design of schematics, layout, interconnections, and...
The paper presents a two stage low noise amplifier for a MEMS gyro readout circuit. BiCMOS circuitry allows the LNA to achieve low noise level at the working frequency of 15 kHz without using chopper stabilization technique and large biasing currents in the first stage. First stage of the low noise amplifier is a three stage opamp with resistive feedback, first stage of which is a bipolar stage with...
This article suggests a method for the return loss compensation for flexible antennas. MIMO-antenna with nine patches and its model were designed with operating frequency of 5.33 GHz. The antenna was measured and simulated in different states, and for compensating the return loss increase during bent state of antenna the all-capacitance matching network was suggested with variable values. Compensation...
This paper presents a current driver for an integrated angular acceleration sensor readout circuit. The architecture of the proposed amplifier consists of a voltage follower and an inverting amplifier to achieve a differential output. The amplifier and the follower are based on a three-stage class AB operational amplifier with a power output stage. The output current of current driver is controlled...
This paper presents a device that resamples a digital signal and which is based on a hardware-software complex (HSC) of a secure communication channel for self-organizing networks. In addition, the development of a model of the resampling device in MATLAB Simulink and its description in Verilog will be discussed. Furthermore the results of simulations of the device in Xilinx ISim are shown, as well...
A survey on various method of extracting small signal and large signal models parameters for GaN HEMT is presented. Small signal parameters are calculated from measured s-parameters, and a large signal model is derived by introducing additional nonlinear lumped elements to the small signal model. The transistor model is analyzed as the complex of the extrinsic and intrinsic model. Intrinsic parameters...
This paper presents a two stage low noise chopper amplifier for integrated angular acceleration sensor signal processing circuit which consists of amplifiers, phase-locked loop and automatic gain control. Capacitor feedback amplifier circuit is one of the most suitable for CMOS technology however capacitor amplifier with chopped op-amp has poor low frequency performance because of parasitic resistive...
In this article particularities of implementing integrated antennas for RFID systems are discussed including the choice of antenna type along with basics for finding the optimal frequency considering the mutual coupling of reader's and tag's antennas. Testing approaches for measuring the integrated antenna's parameters and modulation-depth measurement method allow evaluating the influence of factors...
A wideband CMOS variable gain amplifier (VGA) with a wide gain tuning range for automatic gain control (AGC) in wireless communication systems is presented in this article. The VGA shows a maximum gain variation of 84 dB, its −3 dB bandwidth is 600 MHz at a maximum gain of 40 dB and 1.6 GHz at a minimum gain of −44 dB. The VGA gain is adjusted by applying external control voltage at the range of 350...
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