The general principle of direct digital frequency synthesizer(DDFS) is introduced and its improving version is proposed in the paper. A sin/cos signal generator using this version has been designed,having both the frequency range from 0.01Hz to 30kHz with frequency in interval 0.01Hz and the standard frequency stability of crystal oscillator.
Microwave power measurements have taken an important role in electromagnetics,it can be used in many cases, for example,it can be used to measure output of transmitter(includes power of antenna system)and monofier,and to adjust milliwatt power meter and standard signal generator,etc.
The contrastive results of methane con-version , yield and selectivity of C2 and C2H2 have shown that the catalyst made by this method is superior tothat by conventional chemical method,and the vibrator is effective.
The system design adoption CMOS integrated circuit CD4060 is central with the divider and vibrator and postpone control system. Solution scan the electronic microscope to postpone automatically shut down and heat the empress the cooling of problem.
A digital accelerometer is developed by using a ring oscillator (RO) and a mixer.
Based on this fact, firstly, a snake-like robot controller with cyclic inhibitory CPG model was designed, and then the stability of a single neuron, CPG model and the NON (neuron oscillator network) was analyzed.
A method based on the energy dissipation mechanism of an Independent Oscillator model is used to calculate the frictional force and the friction coefficient of interfacial friction.
The dipole oscillator strengths for the 1s22s-1s2np and 1s22p-1s2nd (n ? 9) transitions of V20+ ion are calculated with the energies and FCPC wave functions obtained above.
The calculations are based on the liquid drop macroscopic model and the microscopic model with the modified single-particle oscillator potential.
This paper constructs the probability model of Gunther generator at first, and the finite dimension union distribution of the output sequence is presented.
It gives the theoretical foundation about why Gunther generator can avoid the statistic weakness of the output sequence of stop-and-go generator, and analyzes the coincidence between output sequence and input sequences of Gunther generator.
On the basis of a conventional permanent magnet (PM) synchronous generator's construction, a novel kind of Hybrid Excitation Permanent Magnet Synchronous Generator (HEPMSG) is introduced by inserting exciting winding in the stator or rotor.
Efficiently implemented in field programmable gate arrays (FPGA), the generator prototype of the proposed sequence has been realized and incorporated into fast FH radio.
Analysis of DC output voltage ripple in an electromagnetic doubly salient brushless DC generator