What is the stroke of the load?
The load is to change the load impedance of the radio frequency load (RF) for the purpose of measuring the resulting power of the RF power devices for large signals and extreme conditions. The test device could be RF power amplifier with a typical 50-ohm impedance, which is the nominal impedance of the line. The load draft measurement makes it possible to observe the properties of the circuit useful when improving the design of the circuit for better performance under extreme signal conditions and operating conditions.
In the radio electronics, the RF power amplifier is ideally evaluated as a purely resistance at its center frequency. The RF amplifier is designed to work on a certain frequency range, so that power measurements will be required at frequencies other than the center frequency. Usually reduced performance at extreme frequency range. Extreme lowest and highest frequencies for range can result in amplifier profit, which is half of the nmi -first frequency.
loads change the load impedance for test power amplifiers, while the source thrust changes the output impedance of the signal source. For example, the output impedance of the power amplifier could be modified to measure the resulting energy transfer properties. This could include the measurement of transmission efficiency, determining the ratio of actual power that achieves the load on the actual power that has been sent from the transmitter. The harmonious stroke of the load acknowledges the output impedance and the impedance of the line in harmonic, which are frequencies that are multiples of operating frequencies. For example, the double operating frequency is the second harmonious, while the triple operating frequency is the third harmonious.
Comparison of the impedance between the radio transmitter and the transmission guidance requires electrical conditions that include capacituive and inductive characteristics of the output of both radio transmitters and transmitters. The capacity reactance in the circuit is due to the proximity of the peripheral nodes thaté cause the electrostatic field to be caused by the difference in voltage. The result is a tendency to voltage for the current flow delay. This mechanism causes the need to compensate the capacity effects with induction elements in the circuit. The induction element can be concentrated inductors or can be distributed inductance due to the length of the circuit or copper tracks.
The SMITH Graph tool helps the comparing impedance process. The SMITH graph indicates a purely resistant circuit and two cases of reactance. The circuit may be capacitive or inductive if it is not purely durable. In a purely resistance circuit, the load absorbs all input power. The load measurement can ensure that the perimeter's performance at low and large signal levels is acceptable, with regard to criteria such as transmission efficiency and harmonious output.