نتایج جستجو برای: phase detector
تعداد نتایج: 652150 فیلتر نتایج به سال:
Article history: Received 27 August 2014 Received in revised form 24 March 2015 Accepted 29 March 2015 Available online 3 April 2015
Directly detecting the phase of a baseband signal from the ratio of the in-phase and the quadrature phase component, a delta-sigma phase detector can realize an AGC-free mobile communication receiver. This paper studies the performance of the phase detector applied to digital communication systems. Theoretically explaining phase quantization noise of the detector, we show the performance of a P...
In this paper we introduce and describe an optimized phase detector suited to 16-QAM receivers which prevents ambiguous locking and performs relatively rapid acquisition. Based on a new decision scheme, the proposed phase detector outperforms a classical decision directed phase detector over a Gaussian channel. An analytical analysis of the proposed phase detector variance is carried out and va...
Two modified methods for assaying sodium diclofenac were developed by GC and HPLC. Diclofenac was converted into methyl ester derivative by methyl iodide in acetone. The ester was extract and subjected to GLC with flame ionization detector. %5 SE-30/chrom W-HP (80-100 mesh) was used as a column in GC. For reversed phase HPLC, the mobile phase was methanol and water (55-45). The separation was p...
Most systems which require phase information use mixers somewhere in the measurement or comparison of the phase information. Theoretically, any mixer with a dc coupled port could be used as a phase detector. Practically, however, mixers often display some very non-ideal characteristics (e.g., dc offset) when used as phase detectors. The actual mixer chosen for a particular application will ofte...
-The proposed paper shows existing problems in VCOs and synthesizers due to the nonlinearities in the active devices and external integrated circuits. This paper proposes a design guidance on how to minimize such effects in oscillators by using nonlinear, rather than linear, tools. In synthesizers, the reference frequency and its harmonics will mix with the output frequency in the phase detect...
Attosecond science relies on the use of intense, waveform-controlled, few-cycle laser pulses1 to control extreme nonlinear optical processes taking place within a fraction of an optical period. A number of techniques are available for retrieving the amplitude envelope and chirp of such few-cycle laser pulses. However, their full characterization requires detection of the absolute offset between...
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