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Project 2: Wide-band TV Amplifier EE 140 – Fall 2010 Brian Zimmer Chau H. V. Nguyen

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Design Common Base (high bandwidth) Low Vdd for low power C2 decreases input resistance RE||(rπ+Rb)/(β+1) rπ/(β+1)50 Re sizing: p1 = gm/Cpi gm = Ic/Vt Ic = Ve/Re (Ve fixed at 10% Vdd) So want small Re! Rc sizing: Gain = gmRc > 5 Rc/Re > 0.26

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Measurements/Results Put resistor in parallel with R1 to increase gain!

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Lessons Take the time to do the hand calculations in order to gain intuition Do incremental design (both in SPICE and physically) – Eg. Use ideal sources to bias first Overdesign in SPICE Simpler designs easier to get right physically Be careful soldering

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