Examen B1 Dispositivos Electronicos 2017 PDF

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UNIVERSIDAD INDUSTRIAL DE SANTANDER Escuela de Ingenierías Eléctrica, Electrónica y de Telecomunicaci DISPOSITIVOS ELECTRÓNICOS PRIMER EXAMEN PARCIAL. PROF.: AA, JM & ER. Nombre:

Código:

1. [1.5] Assuming ideal opamps in Fig. 1, prove that the following expression for DC gain holds considering that V2=-V1:

Figure 1. Hint: use superposition circuit technique. Answer the following questions for item 1: 2. [0.5] Qualitatively, how does a capacitor connected in parallel to R3 modify the DC gain.

3. [0.5] If V2=0, what is the new DC gain expression?

Answer the following questions considering the Fig. 2: 4. [0.5] Assuming that you are measuring a 2nA current at the input and the opamps have zero offset, what would be the voltage measured in a Voltmeter at pin 3 of U1?

UNIVERSIDAD INDUSTRIAL DE SANTANDER Escuela de Ingenierías Eléctrica, Electrónica y de Telecomunicaci 5. [0.5] Assuming that you are measuring a 2nA current at the input and now you have opamps with 10uV offset referred to the input , what would be the voltage measured with a Voltmeter at pin 3 of U1? Hint: Remember the origin of the offset.

6. [0.5] What is the main purpose of the circuit composed by U2,R6,R7?

7. [0.5] What would be the voltage at the output (J3-J4) if you are measuring a 2mA current at the input and the opamps have a 10uV offset?

8. [0.5] What would be the new DC gain of the circuit (out/in) if C1 and C2 increase their capacitance to 10uF, what is the old gain?...