A novel laser system for ro-vibrational spectroscopy using coherent anti-Stokes Raman Scattering in hybrid fs/ps regime is presented. A single Yb:KGW laser source is used as a master laser to generate the three CARS laser beams, namely the pump and Stokes femtosecond pulses and a 58 ps probe pulse. Master oscillator power amplifier (MOPA) architecture is implemented to increase the probe output power using a custom two stage free space linear amplifier. The probe is 0.37 cm−1 in width and 100 µJ in energy to allow resolving the Q-branch ro-vibrational lines of N2 and recording single shot CARS spectra at kHz repetition rate in flames. An original and simple technique based on the study of the influence of probe delay and polarization has been setup to optimize nonresonant background rejection, with no loss in resonant contribution. CARS performances are reported for N2 thermometry between 300 K and 3000 K, demonstrating state of the art precision.
The main aim of this study is to design efficient inductive power transfer (IPT) system which includes series L-C resonant circuit and load network. In order to achieve high efficiency, class-D amplifier, which includes two switching devices (MOSFET), was implemented and the MOSFETs are driven by 0.5 duty cycle PWM signals which are generated by IR2110 MOSFET driver. The inductive link was realized by primary and secondary coils which consists of copper wires and in the experiment, 70.58% transmission efficiency was obtained. The input and output power are 2.55 W and 1.8 W respectively. Also the switching performance of driver in class-D amplifier has been observed and analysed.
Cell free (CF) massive multiple input multiple output (mMIMO) has been suggested as a key solution to meet the high data rate demands of future wireless communications. Studying the performance of these systems in practical scenarios such as in the presence of hardware impairments is of vital importance. In this paper, we study the effect of power amplifier non-linearity on the uplink and downlink sum-rate of CF mMIMO systems. We derive closed form expressions for the uplink and downlink achievable sum-rates of orthogonal frequency division multiplexing (OFDM) based CF mMIMO systems. Our results show that in the uplink the sum-rate does not increase unlimitedly as the number of access points (AP) increases, being upper bounded, contrarily to the ideal linear case. In fact, the rate of each user is limited by the distortion signal of its power amplifier. However, in the downlink, the sum-rate of the system with non-linear power amplifiers is not bounded and increases unlimitedly with the number of APs. Our results also indicate that for the same signal to distortion ratio (SDR) at the power amplifier output or the same normalized saturation level of the power amplifiers, the relative downlink sum-rate degradation is lower than the relative uplink sum-rate degradation (both with respect to their corresponding values in the ideal linear case). In fact, our results confirm that the user side power amplifier non-linearity has higher impact on the system performance than the power amplifier non-linearity on the AP antennas.
Any tape player picks up a very tiny magnetic field from the tape, amplifies the signal with an electronic amplifier, and sends the large signal to a speaker where it creates a large magnetic field to move the speaker back and forth.
A parametric array (PA) loudspeaker is a highly directional audio source that might grant one’s convenience if it is used with mobile devices. However, conventional PA loudspeakers is almost impossible to apply in mobile devices using a battery because of the large power consumption and large device size. In this study, a PA loudspeaker system (PALS) was fabricated and evaluated to show that those difficulties could be overcome to apply it to mobile devices. In order to construct a PALS for demonstration, a power amplifier and signal-processing unit should also be properly designed and built. The PA source transducer should also be designed and built for a mobile device application. These components were integrated into a single PALS. The PALS generated a 125-dB primary wave and 62 dB of a different frequency wave (DFW) through the PA at 0.45 m in a 3 m × 3 m × 2 m semi-anechoic chamber. We confirmed that the half-power bandwidth (HPBW) formed a 6° beam at 83 kHz of DFW and 90 kHz of the primary wave (PW), and the HPBW formed a 7.3° beam at 5 kHz of DFW and a 7.1° beam at 10 kHz of DFW, respectively. Lastly, the power required was 6.65 W without a matching circuit, and 3.25 W with such a circuit.
If you buy a “WiFi signal booster”, what you’re probably going to get is a Wireless repeater
. It will contain at least one (fairly modest) RF power amplifier, but that will be only a small part of it. It’s a complicated, mostly digital device that has much of the same componentry as a wireless router. It listens for packets of data on the network you set it to boost, and then rebroadcasts them. It’s a
A digital amplifier is an analog amplifier with an integrated digital to analog converter at its input. In other words a digital amplifier accepts a digital signal, converts it to an analog signal and amplifies it. An analog amplifier only accepts an analog signal and amplifies it.
Of course the intended use of any amplifier will override any preference or choice. A large tube radio for mountain climbing or jungle safari is not practical.
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