EE1A Pre-Lab6 - mandatory pre lab PDF

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Adam Ebeltof SID: 861200828 11/17/16 EE01A Lab TA: Nowshin EE PreLab 6 1.) What is described by the voltage transfer characteristic? The voltage characteristic creates a voltage response of a circuit into another voltage signal. Basically, the voltage response is an output and the signal is an input. 2.) What is the operational amplifier? Which type of signals do op-amps amplify? The operational amplifier is a type of differential amplifier that is characterized by a large gain in voltage with values ranging from 105V to over 109V. Operational amplifiers are five-terminal devices with 2 inputs, 1 output, and 2 terminals for power. Also, operational amplifiers have a non-inverting or positive input Vp with its terminal known as "+", with inverting input Vn "-", and an output Vo. They amplify tiny signals from sensors so analog-to-digital converters (ADCs) can digitize them. 3.) What determines the saturation of op-amp amplifiers? The voltage transfer characterstic of op-amps shows saturation with the output voltage. This is determined by the power supplies VCC+ and VCC-. 4.) What are the fundamental electrical properties of the ideal op-amps? According to table 1.11, it can be observed that since (1.10) Vp = Vi and Vn = Vo, then Vo = Vi. 5.) What is a gain of voltage follwers? The gain of the voltage follower will be A = 1. Since Ip = 0, the voltage follower will not load the source Vi. 6.) Design an inverting op-amp amplifier with the gain 0.5 V/V. Gain(AV) = -R2/R1 Example: if R2 is a 100k resistor and R1 is a 10K resistor the gain would be: -100K/10K = -10 (Gain AV) Therefore if the input voltage is .5v the output voltage would be: (.5v)(-10) = -5v 7.) What is a convention used in numbering pins in DIP IC packages? The convention in DIP IC packages is a rectangular housing with two parallel rows of electrical connecting pins. These pins start on the lef of a groove when looking from the top and continues counter-clockwise.

8.) How to establish a complete tracking of magnitude of positive and negative voltages in B&K Precision 1761 power supplies? Push in the INDEP/TRACK button to begin the voltage tracking and establishing a common ground. 9.) How would you define the "node voltage"? The voltage drop from a node to the ground (reference node) is called the node voltage. 10.) What is the purpose of resistor R_D in the schematic of Figure 1.16? The purpose of R_D in the schematic is because it satisfies KVL. If the R_D is not there, Vi and Vp cannot be equal since their values are not the same. 11.) What are the primary disadvantages of analog computers? Analog computers are used as intermediary roles to either perform basic preliminary calculations and refine data in digital computers (hybrid analog digital computing) or to link digital computers to the analog world. 12.) How would you modify the circuit of Part 2 to compute an analog function v_o = 2v_1 + 1? In order to circuit the first op-amp part in a voltage follower and second one, you have to use the scaling summing amplifier. V_o = -[5(R_F1 + R_F2)/R_A + V_i(R_F1 + R_F2)/R_B] we need: |V_o| = 2V_o + 1 So, R_F1/R_B = 2 Let R_F2 = 0, if R_F1 = 10k then R_B = 5k 5(R_R1/R_A) = 1 10k(5)/R_A = 1 R_A = 50k...