Phase Characteristic

Phase Characteristic

 

in linear circuits, a graphic curve expressing the dependence of the phase shift between the harmonic oscillations at the input and output terminals on the frequency of the harmonic oscillations at the input. The phase characteristic is mostly used as a means of evaluating phase distortions of complex signals, such as video signals. Such distortions may be caused by unequal time delays of individual harmonic components traveling through the circuit. The requirements that must be met by the phase characteristic are particularly stringent for circuits in radio-engineering systems that provide phase processing of signals, in multichannel communication systems, and in measuring devices. In the great majority of circuits, there is a one-to-one relationship between the phase characteristic and the amplitude characteristic.

References in periodicals archive ?
From the amplitude L([omega]) and phase [phi]([omega]) characteristics presented in this diagram, it is seen that the system is stable, since the amplitude characteristic crosses the abscissa axis before the phase characteristic, finally decaying, goes over the value of the angle -180[degrees].
From the perspective of intrusion detection, this model decomposes the attacking process into 7 steps of reconnaissance, weaponization, delivery, exploitation, installation, command and control, and actions on objectives, and this model meets the phase characteristic of APT attack.
This solution keeps the good properties of FIR filters (especially a linear phase characteristic).
The phase characteristic of the filter is not linearly dependent on the frequency (see Fig.
Thus, [12] designed the automatic control loop using the phase characteristic but the controlled frequency difference is influenced by the quadrature coupling.
Also, the phase characteristic of a disk rubbing with a ring supported elastically was used to explain the mechanism of stiffness increase phenomenon [18].
The phase characteristic of steady-state periodic solution is analyzed in Section 4.
In addition to the above analysis, the reflection phase characteristic is also examined with the simulation model as shown in Figure 4.
Without phase correction via DSP-based bandwidth enhancement, most hardware amplifiers have a phase characteristic similar to that shown in Figure 3a: The phase lag and corresponding time delay increase with frequency in the stop band beyond the -3-dB point.
if input signal is multiplied by a constant, the output is multiplied by the same value etc.) and all observed signal distortions are consequence entirely of non-constant course of phase characteristic of filter.
Our main contribution are: We first develop a key generation mechanism using the phase characteristic of UWB channel.
Then we apply Kramers-Kronig relations to determine corresponding causal amplitude responses for each phase characteristic. The optimally engineered causal characteristic is identified, which exhibits the largest NGD to out-of-band gain ratio.