Real inductors have turn-to-turn winding capacitance that acts as if it were a parallel circuit element. The self-resonant frequency (SRF) of an inductor is the frequency at which the inductive reactance is equal in magnitude to the capacitive reactance of the windings. At the SRF, the induc...
In the conducted immunity test, the disturbance in cable or power supply is created by an RF amplifier, and the device’s function should not be affected by that distortion or interference in the power supply. Radiated and conducted emission (Image:Academy of EMC) Radiated immunity In a radiat...
For an amplifier, PSRR is the ratio of the change in output voltage to the change in power supply voltage, expressed as a ratio (PSRR) or in dB (PSR). PSRR can be referred to the output (RTO) or referred to the input (RTI). The RTI value is equal to the RTO value divided by ...
Back EMF from inductive loads becomes more significant at higher frequencies, making voltage peaks more likely to occur when the amplifier is high-passed. If that understanding is accurate, I agree that it's a real-world phenomenon. However,...
There are two basic functions that a transistor can perform. It can either act as a switch or as an amplifier. When acting as a switch, the faucet allows a current to flow through its pipe only when its handle is supplied with a certain amount of voltage. When provided a voltage lesser...
This tells us if the current is leading the voltage, or if it is lagging behind the voltage in the transmission line. When the reactive power value is positive it is lagging, indicating an inductive load that is consuming reactive power. When the reactive power value is negative it is ...
The sine wave to drive the transducer is generated by an internal high stability Wien Bridge Oscillator. The frequency of the oscillator is set by linking pins or adding external resistors. The sine wave is then passed through a power amplifier to provide sufficient current to drive most ...
If the amplifier is implemented as an integrated circuit, a bulky and expensive thermally enhanced package may be needed to facilitate heat transfer. These considerations are onerous in consumer products such as flat-screen TVs, where space is at a premium—or automotive audio, where the trend ...
In the high-frequency band (greater than 10MHz), the inductive reactance is still small, and the impedance is very large so that when the energy of the high-frequency signal passes through the magnetic material, it is converted into heat and dissipated, which prevents the passage of the high...
generator is used to generate electromagnetic waves, which are the input of the RF amplifier. The output of the RF amplifier is generated by an electromagnetic field of varying frequency and transmitted via an antenna. As shown in the diagram, the antenna transmits electromagnetic waves for EUT....