Amplifier Part 15. RF Amplifier Design: How to Find Max Available Gain (MAG) for Stable Transistor.
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A student recorded a set of S-parameters measurements on a BJT transistor at a frequency of 100MHz and biasing conditions VCE =10V, IC =10mA. Explain whether there will be a change to the set of S-parameters reading when:
the frequency is changed to 150MHz, while the biasing conditions remained unchanged at VCE =10V, IC =10mA.
the biasing conditions are changed to VCE = 5V, IC = 5mA, while the frequency remained unchanged at 100MHz.
a) Change .
the s-parameters changes when frequency is changed.
b) Change .
The s-parameters changes when the biasing conditions are changed.
The stability circles of 4 different transistors are shown below.
Shade the areas corresponding to the stable region of the transistors.
Indicate on the figures, whether the transistors are unconditionally stable or conditionally stable.
An RF transistor has the following S-parameters at a given bias conditions at 300MHz:
S11 = 0.38 170
S22 = 0.36 - 43
S21 = 7.20 53
S12 = 0.04 60
The RF transistor is used to design a 15dB Gain amplifier at 300MHz. The amplifier is to operate between 50 terminations.
Calculate the Stability Factor, K. Is the transistor unconditionally stable?
(b) Calculate the Maximum Available Gain, MAG. Can this transistor be used to obtain a gain of 15dB?
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