Problem 2: Class E Amplifier Design A schematic of class E amplifier is shown in the figure 2 given below For optimum operation with 50% duty cycle and when the loaded quality factor QL of series fundamentally tuned resonant R-Lo-C, circuit is infinite to provide pure sinusoidal current flowing into load R a) What are the nominal voltage conditions across the switch that a class E amplifier has to satisfy b) In such conditions give the expression of i(t) and v(t) at the drain source junction c) For these waveforms, demonstrate that the loading RLC network must verify R v? R = 0.5768 d P C = 0.1836- L = 1.1525

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Problem 2: Class E Amplifier Design
A schematic of class E amplifier is shown in the figure 2 given below
For optimum operation with 50% duty cycle and when the loaded quality factor QL of
series fundamentally tuned resonant R-Lo-Co circuit is infinite to provide pure sinusoidal
current flowing into load R
a) What are the nominal voltage conditions across the switch that a class E
amplifier has to satisfy
b) In such conditions give the expression of i(t) and v(t) at the drain source
junction
c) For these waveforms, demonstrate that
the loading RLC network must
verify
L = 1.1525
R = 0.5768 dd
P
C = 0.1836-
OR
d) What is the value of the optimum phase angle seen by the switch at the
fundamental frequency?
RFC
L
Lo
Co
Io
ic
iR
Vu
R
Figure 2
e) Using the I/V curves of the transistor given in problem 1 along with its output
parasitics, and having an input impedance of 10-15j at 1 GHz, design a class
E amplifier for a nominal frequency of 1 GHz biased in class B mode using
lumped elements for the matching and biasing networks in a 50 2 system.
Transcribed Image Text:Problem 2: Class E Amplifier Design A schematic of class E amplifier is shown in the figure 2 given below For optimum operation with 50% duty cycle and when the loaded quality factor QL of series fundamentally tuned resonant R-Lo-Co circuit is infinite to provide pure sinusoidal current flowing into load R a) What are the nominal voltage conditions across the switch that a class E amplifier has to satisfy b) In such conditions give the expression of i(t) and v(t) at the drain source junction c) For these waveforms, demonstrate that the loading RLC network must verify L = 1.1525 R = 0.5768 dd P C = 0.1836- OR d) What is the value of the optimum phase angle seen by the switch at the fundamental frequency? RFC L Lo Co Io ic iR Vu R Figure 2 e) Using the I/V curves of the transistor given in problem 1 along with its output parasitics, and having an input impedance of 10-15j at 1 GHz, design a class E amplifier for a nominal frequency of 1 GHz biased in class B mode using lumped elements for the matching and biasing networks in a 50 2 system.
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