tut2 - (b) Plot the input (G S ) and the output (G L )...

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EE4101 Tut 2 Q1 A certain GaAs MESFET has the following S parameters measured at 9 GHz with a 50 ohms reference: S 11 = 0.64 /-170 o S 12 = 0.05 /15 o S 21 = 0.57 /-95 o S 22 = 2.10 /30 o (a) Determine the amplifier’s type of stability by computing the delta factor Δ and the stability factor k. (b) Find the center and radius of the input stability circle and plot the circle. (c) Determine the center and radius of the output stability circle and plot the circle. Q2 A certain microwave transistor has the following S parameters measured at 4 GHz with a 50 ohms reference: S 11 = 0.707 /-155 o S 12 = 0 S 21 = 0.510 /-20 o S 22 = 5.0 /180 o (a) Determine the maximum transducer gain achievable with the transistor.
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Unformatted text preview: (b) Plot the input (G S ) and the output (G L ) constant-gain circles for 2, 1, 0, and -1 dB. Q3 Data for the HXTR-6101 silicon bipolar transistor at 4 GHz with a 50 ohms reference are: S 11 = 0.522 /-169 o S 12 = 0 S 21 = 0.839 /-67 o S 22 = 1.681 /26 o F min = 3.5 dB Γ opt = 0.475 /166 o R N = 3.5 Ω Draw the F = 3 dB noise figure circle and the G S = 0 dB circle. From these determine the source reflection coefficients, and hence the source impedance required to realize both values. What is the maximum available gain under these conditions?...
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