By Anna N. Rudiakova, Vladimir Krizhanovski
Complicated layout innovations for RF strength Amplifiers presents a deep research of theoretical features, modelling, and layout thoughts of RF high-efficiency energy amplifiers. The publication can be utilized as a consultant via scientists and engineers facing the topic and as a textual content publication for graduate and postgraduate scholars. even supposing basically meant for experienced readers, it offers a very good speedy begin for newbies.
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Extra info for Advanced Design Techniques for RF Power Amplifiers (Analog Circuits and Signal Processing)
In this case, Z i should be selected equal to the RL1 , while Z L means the actual load value, that can be standard 50Ohm or 75Ohm. 3 Cross-product suppression in the output signal spectrum The nonlinear behavior of transistor power amplifier is the cause of cross-product components in the output signal spectrum. These components are the harmonics and sub-harmonics of valid signal, and intermodulation distortions. Matching conditions and cross-product suppression conditions can give the contradictory requirements on output electrical network.
2 From Eq. (2-16) the following can be obtained: a1 = SVBE ω0τ S B1 + A1 , ⋅ 2π (ω0τ S ) 2 + 1 b1 = SVBE ω0τ S A1 − B1 , ⋅ 2π (ω0τ S ) 2 + 1 (2-16) 40 Chapter 2 I1 = 2 2 A1 + B1 , (ω0τ S )2 + 1 SVBE 2π § ω0τ S A1 − B1 · ¸¸ . © ω0τ S B1 + A1 ¹ ϕ I1 = arctg¨¨ The third harmonic cosinusoidal and sinusoidal Fourier components can be written as follows, correspondingly: a3 = 1 ³ i cos(3ω0t )d (ω0t ) , π −θ C θ1 b3 = 1 θ1 ³ i sin(3ω0t )d (ω0t ) . π −θ C In order to find a3 and b3 , both parts of Eq. (2-13) should be sequentially multiplied on sin(3ω0t ) π , and cos(3ω0t ) π , and integrated on ω0t from − θ to θ1 .
2-3. The out-of-phase first and third harmonics can be obtained for these angles by adjustment the output network. One can see, that the “allowed” region is displaced to smaller conduction angles with frequency increasing. 5 f S , where f S = 1 (2πτ S ) ). However, the output power is decreased with decreasing the conduction angle that should be noted in design. The set of dependencies of first harmonic collector current magnitude on conduction angle is shown in Fig. 2-4 for different values of ω0τ S .
Advanced Design Techniques for RF Power Amplifiers (Analog Circuits and Signal Processing) by Anna N. Rudiakova, Vladimir Krizhanovski