Consider the idealised equivalent circuit for an op-amp shown below. Normally we assume that the op-amp gain, A is infinite, however in this question let's assume it is 210,000. Under a certain operating condition the output voltage is known to be +9.1 v. In all of the questions below, give numeric answers correct to 3 significant figures and include units where required. >A(V2 - V;) Vo a) What is the value of the input current iq and why iq = 0 A because of infintie input resistance. O ig is unlimited because of zero input resistance. O ir is unlimited because of infinite input resistance. O ig is unlimited because of virtual eartl. O i1 = 0 because of virtual earth. O i1 = 0 A because of zero input resistance. b) Find the inverting input voltage v, if the non-inverting input voltage v2 is connected to ground (0 V). 数字 单位 c) Find the non-inverting input voltage v2 if the inverting input voltage v1 is -3 V. For this part only, give your answer to 7 significant figures. 数字 单位 d) Based on the answers to parts b) and c) what can use say about the relationship between the two input voltages? O v1 << v2. (V1 is much less than v2) O v1 >> v2. (V1 is much bigger than v2) O v1 s v2. (V4 is approximately equal to v2)

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Antenna Array

An antenna array is a group of antennas joined together and arranged in a regular pattern to form a single antenna capable of producing radiation patterns that individual antennas cannot. As the antennas are constructed as an array, sufficient spacing and phase must be given.