- #Chris bowick rf circuit design download pdf#
- #Chris bowick rf circuit design download verification#
The relationship between the incident and reflected wave is known as the reflection coefficient, Γ, a complex number that contains both magnitude and phase information about the signal. If Z L≠ Z 0, some power is reflected from the load back to the source, and maximum power transfer does not occur. If Z L = Z 0, total power is transferred from the source to the load. Voltages, currents, and power from a source, of impedance Z S, travel in waves to the load, of impedance Z L, along a transmission line of impedance Z 0. Similar to the familiar dc relationship, the maximum power transfer at high frequencies is related to the impedance of the power source and the impedance of the load. In order to understand the concept of S-parameters, it is important to know some transmission line theory. As such, the device can be completely characterized by observing the behavior at its input and output terminals. If the device performance is independent of the control terminal, once set, the relay can be simplified to a two-port device. As shown in Figure 1, an RF relay can be thought of as a three-port device, with an input, an output, and a control to switch the circuit on and off. In addition, it may not be possible to characterize every parameter of a complex IC over frequency, so system-level characterization using S-parameters may provide better data.Ī simple RF relay can be used to demonstrate the techniques of high-frequency model verification. Traditional low-frequency parameters-such as resistance, capacitance, and gain-can be frequency dependent, and thus may not fully describe the performance of the IC at the desired frequency.
S-parameters allow a device to be treated as a “black box” with inputs and resulting outputs, making it possible to model a system without having to deal with the complex details of its actual structure.Īs the bandwidth of today’s integrated circuits increases, it is important to characterize their performance over wide frequency ranges. Here, scattering refers to the way traveling currents or voltages are affected when they meet a discontinuity in a transmission line. S (scattering) parameters are used to characterize electrical networks using matched impedances.
#Chris bowick rf circuit design download pdf#
Joseph Creech Загрузить в формате PDF Introduction to S-Parameters
#Chris bowick rf circuit design download verification#
S-Parameters Allow High-Frequency Verification of RF Switch Models
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