In the circuit below, we know that Q1 and Q2 have Beta-100 and VA-100 V. (a) Knowing Vcc=10 V, solve the circuit for DC to find the voltage and current of all the nodes and branches in the green box. Capacitors are very large in capacitance. Vsig Rsig= 100k Vi-Vin RB1= 400k RB2= 400k Vcc www I=1.01mA Vcc RC1 =5k Q1 HH I=1.01mA Vcc www RC2 =5k Q2 Vout RL= 5k

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Thevenin Theorem

Any linear circuit, no matter how complex, maybe simplified to an equivalent circuit utilizing only a single voltage source and series resistance coupled to a load, according to Thevenin's Theorem. The superposition principle says that all foundational equations must be linear, and the notion of "linear" is still the same (i.e., there should not be any exponentials or roots). This is particularly the case when operating with passive elements like resistors, inductors, and capacitors. However, some components (particularly some gaseous and semiconductor devices like tunnel diode, Schottky diode, transistors like BJT, MOSFET) are nonlinear, meaning their current resistance fluctuates with voltage and current. As a result, circuits made up of these parts are known as nonlinear circuits.