Topic
Sine wave
About: Sine wave is a research topic. Over the lifetime, 12183 publications have been published within this topic receiving 93013 citations. The topic is also known as: sinusoid.
Papers published on a yearly basis
Papers
More filters
12 Nov 2007
TL;DR: It is shown that the output spectrum of the TIDAC is identical to the output of a DAC running at a higher sampling rate, and the analog interpolation filter design is simplified.
Abstract: In this paper, a differentially encoded time-interleaved digital-to-analog converter (TIDAC) structure for ultra-wideband (UWB) signal generation is presented. We show that the output spectrum of the TIDAC is identical to the output of a DAC running at a higher sampling rate. To support the mathematical derivations, the UWB signal generator has been implemented on FPGA hardware and measurements have been taken for a sinusoidal wave, a Gaussian UWB pulse shape and for a UWB OFDM signal. The measurements show that, compared to the single-channel DAC, the mirror images around the sampling frequency can be reduced by about 30 dB and the analog interpolation filter design is simplified.
44 citations
Patent•
26 Oct 2001
TL;DR: In this article, a power line communication system with a sine wave approximator and a high frequency clock is described, where each transmitted cell is of one of four phases 0, 90, 180 or 270 degrees relative to the phase of a preceding transmitted cell.
Abstract: A power line communication system (20) includes a field-programmable gate array (FPGA) having a sine wave approximator (28) driven by a high frequency clock. The sine wave approximator (28) generates a high frequency sine wave-shaped communication signal on command by a processor (22). The data transmission scheme includes sending a sequence of fixed length and fixed frequency cells wherein each transmitted cell is of one of four phases 0, 90, 180 or 270 degrees relative to the phase of a preceding transmitted cell with the first transmitted cell designated as a zero phase reference cell. Data transmissions are synchronized by the voltage zero crossings of the AC power line (32) and each transmission consists of 27 cells evenly distributed over the AC voltage line half cycle. The high frequency sine wave shaped communication signal is superimposed on the low frequency (60Hz) AC power line (32) via a transconductance amplifier (30) which draws current from the AC power line (32) via a full wave bridge rectifier (34).
44 citations
28 Sep 1991
TL;DR: In this paper, various power factor correction techniques used in fluorescent lamp ballast are described, and a more accurate form of power factor derivation is presented which takes into account distortions of the AC line voltage.
Abstract: Various power factor correction techniques used in fluorescent lamp ballast are described. The basic circuit used to control the lamp voltage and current is the current-fed sine wave inverter. Numerous different passive power factor correction circuits were designed, built, and tested. A continuous duty boost converter was designed, built, and tested to make the comparisons. In all cases the wattage line power draw was greater than 300 W. The analytical methodology used to define power factor corrections was reevaluated. A newer version was derived, and a more accurate form of power factor derivation is presented which takes into account distortions of the AC line voltage. An attempt is made to explain the need for low-source impedance to make the correct measurements. >
44 citations
Patent•
20 Dec 1982
TL;DR: In this article, the output of a sine wave oscillator is fed to an emitter-follower through a photocoupler and this output is then fed to the indoor power distribution line through a series resonance circuit after stepping down with a transformer.
Abstract: A system transmits and receives control signals for various types of indoor devices using the existing power wiring in houses and buildings. The transmitter section of the power wiring transmission system is provided with a circuit in which the output of a sine wave oscillator is fed to an emitter-follower through a photocoupler and this output is then fed to the indoor power distribution line through a series resonance circuit after stepping down with a transformer; and the receiving section is provided with a circuit in which the signal from the distribution line is fed to a parallel resonance circuit after passing through a series resonance circuit. Moreover, the input and output sections are resistor terminated.
44 citations
TL;DR: This work derives the condition for the weights on the outputs of the PSO to be a real quantity, and demonstrates how this can be used to generate low distortion sine waves.
Abstract: A novel technique is proposed to generate robust, low distortion sine waves In this method, outputs of a phase shift oscillator (PSO) are weighted and summed to obtain multiple outputs with very low distortion and precise phase relationship The method allows a programmable number of harmonic distortion components to be cancelled over a wide frequency range This work derives the condition for the weights on the outputs of the PSO to be a real quantity, and demonstrates how this can be used to generate low distortion sine waves With the proposed method, in an N-stage PSO, harmonics up to N-2th can be canceled Simulation results using commercial operational amplifier spice models are presented to demonstrate low distortion sine wave generation over 2 kHz-180 kHz frequency range The method has been experimentally verified using extremely low-cost, discrete components to produce 100 dB total harmonic distortion (THD) sine wave
44 citations