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Rigid-body attitude control without angular velocity measurements is considered. The error rotation matrix describing the attitude error is used directly within the control algorithm. A controller composed of a proportional control term and an angular velocity control term is first considered. The proportional control term is a function of the error rotation matrix, while the angular velocity control...
A transmission between two agents, Alice and Bob, over a set of parallel sub-channels is overheard by a third agent Eve, through a second set of parallel sub-channels. All subchannels are flat with random and independent gains and additive white Gaussian noise (AWGN). Alice splits the total amount of available power among the sub-channels, with the purpose of maximizing the communication rate to Bob,...
This paper presents the design and realization of a low-noise, low-power, wide-dynamic-range CMOS logarithmic amplifier for cochlear implant system in a standard 0.18μm CMOS technology. The proposed logarithmic amplifier is based on the true piecewise linear function by using progressive-compression parallel-summation architecture. The overall circuit consumes only 9.1 μW from a 1.3 V single power...
The paper presents performance analysis of an analog front end (AFE) for body-coupled communication (BCC) which is based on data transmission via capacitive coupling through the human body. The AFE designs by cascading differential preamplifier and Schmitt trigger. A flipped voltage follower (FVF) topology is used as part of the preamplifier design. The operation frequency of the overall system is...
This paper studies a two-user Gaussian interference channel in which two single-antenna sources aim at sending their confidential messages to the legitimate destinations such that each message should be kept confidential from non-intended receiver. Also, it is assumed that the direct channel gains are stronger than the interference channel gains and the noise variances at two destinations are equal...
One way of performing indoor localization of objects is by means of Angle of Arrival (AoA). This technology is based on a phased antenna array which estimates the angle of arrival of an incident wave transmitted by a mobile node. This is achieved by measuring the relative phase shifts between the received signals. This paper presents the construction of a Phase Locked Loop (PLL) which synchronizes...
An ultra wideband (UWB) low nose amplifier (LNA) is presented in this paper. It is designed to operate in the complete range (3–10 GHz) as defined by the US Federal Communications Commission (FCC) using the 130 nm CMOS technology process. The main goals of the design are low noise, high linearity and low variance of the gain over the operating frequency range. To achieve this, the two stage topology...
An 1 V 33.2 pS OTA, which consumes power at 5.5 nW, is proposed. This OTA employs the input voltage pre-attenuation technique which based on CMOS common drain circuits with diode connected load to reduce the overall transconductance gain. The linear range of this proposed OTA is 370mV for 1 % transconductance gain variation. Additionally, the pseudo-differential GM-C 2nd order LPF based on this OTA...
A compact 1st-order analog allpass filter operating from a 1.5 V DC supply is presented. The proposed circuit is formed by a handful of subthreshold pMOS transistors, two capacitors and one current source. Verified by circuit simulations using RF Spectre and the AMS 0.35-micron CMOS parameters, the proposed filter consumes 300 nW quiescent power and contributes output noise voltage of 0.03 mVrms while...
A Short-wave ultra-wideband balanced amplifier with high linearity and lower noise based on balanced structure is presented. The amplifier is realized by Equilibrium structure, Balun broadband matching, Coupler feedback and Power backoff technology. Equilibrium structure is used to greatly improve the second order distortion and Lossless coupler feedback to reduce the noise. The RF frequency is 1...
Low noise amplifier (LNA) performs as the initial amplification block in the receive path in a radio frequency (RF) receiver. In this work an ultra-wideband (UWB) 3.1–10.6-GHz LNA is discussed. By using the proposed circuits for RF CMOS LNA and design methodology, the noise from the device is decreased across the ultra-wide band band. The measured noise figure is 2.66 −3 dB over 3.1–10.6-GHz, while...
In this paper, a new pole-zero technique for reducing thermal noise is represented. In the proposed new pole-zero method, by extracting the noise and voltage-gain equations of the amplifier, the zeros of the noise transfer function (TF) are managed, so that they are placed near the poles of the gain TF. Therefore, significant noise reduction is achieved in the condition of maximizing the small-signal...
In this paper an EOG based low-cost real-time wheelchair navigation system for severely disabled people is presented using signal processing techniques, bio-amplifiers and a microcontroller driven servomotor. All the digital signal processing and execution of commands were performed utilizing a microcontroller which drastically reduced the total cost of this project. The servomotor has been synchronized...
A novel strategy of zero optimization in cascaded ΣΔ modulators is presented. In the proposed structure, by using just an analog inter-stage feedback path, one pair of the noise transfer function (NTF) zeros is distributed over the desired bandwidth so that the in-band quantization noise is reduced. The effectiveness of the proposed modulator is verified by analytical calculations and simulation results.
A new ultra-low power fully recycling folded cascode amplifier with low supply voltage is presented. The new configuration benefits from higher transconductance, slew rate and gain in comparison with conventional recycling folded cascode. Furthermore, the phase-margin is enhanced and the input referred noise is reduced in this new configuration. Simulation results in standard 0.18 μm CMOS technology...
Investigation of readout electronic dedicated to electromechanical audio sensor is presented. The circuit is able of reading piezoresistive gauge implemented with silicon nanowire (NEMS) and bring electromechanical signal to high-resolution digital output. Low-noise low-power CMOS operational transconductance amplifier (OTA) is presented. The low-noise amplifier (LNA) has been designed in a 0.28 μm...
Design information is given for developing microwave and millimeter-wave silicon based low noise broadband monolithic transimpedance amplifiers. The required layout optimizations for SiGe HBTs and CMOS devices are described and the foundry selection criteria we employed are reported. An efficient high frequency passive devices implementation and high frequency connectivity solutions with external...
In this letter, a novel fuzzy mask based on wavelet is introduced for improving speech quality and intelligibility. The proposed fuzzy mask is based on wavelet's soft and hard threshold limits to retain the time frequency (T-F) units of the enhanced spectrum. In contrast to prior methods, the proposed fuzzy mask approach eliminates the need of true speech spectrum to obtain a binary mask. Speech spectrum...
With the rapid growth of modern mobile satellite communication technology, the development of very small size, low-cost, low-profile, high gain and high directivity antennas is a must. The design of a mobile satellite communication antenna named as Parabolic Helix and link budget optimization of the proposed antenna system are illustrated in this paper. The proposed antenna has a gain of 15.95dB,...
The paper illustrates design of a fully differential amplifier to sense current signals generated by CMUT for ultrasound imaging. Detection of reflected ultrasonic waves from body tissues requires low noise amplifier with wide input dynamic range. The transducer, being capacitive, isolates dc voltage from the input of the amplifier necessitating additional biasing circuit. In this work, a differential...
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