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  1. ichabodgrant

    Comparator design using a 4-bit adder

    And you mentioned that there should not be Cin? Does this mean there are no cascading inputs?
  2. ichabodgrant

    Comparator design using a 4-bit adder

    I have a question about the XOR gates. Are those XOR gates for doing 2's complement (i am thinking in this way)? But I know that 2's complement is not just inverting 1 and 0, but also needs to add 1 after that. It seems that the above design cannot do that?
  3. ichabodgrant

    Comparator design using a 4-bit adder

    A truth table looks like this? because I have never drawn a truth table for such a design...so I searched on google...
  4. ichabodgrant

    Comparator design using a 4-bit adder

    I think it should be using 2's complement.
  5. ichabodgrant

    Comparator design using a 4-bit adder

    Homework Statement Hi, it's me again. Now I am going to design a 4-bit magnitude comparator using just ONE 4-bit adder and infinitely large number of gates (AND, OR, NOT, NAND, NOR, XOR, XNOR) for signed numbers (negative binary). Homework Equations A > B => A3barB3 + A2barB2x3 +...
  6. ichabodgrant

    Op-amp as a comparator (analog-to-digital conversion)

    Homework Statement Okay, This time it's an exam question. I am doing some past papers and there are questions about comparators which are not introduced in this course (this course is preliminary course for engineering students who are interested in electrical, electronic or computer...
  7. ichabodgrant

    Thevenin's and Norton's Theorem

    IN = 2.6 x 10-3 A and RN = Rth I had thought about using superposition... But when I attempted to do this question, I hadn't clearly understood these theorems. My lecturer just taught too fast... I couldn't really get myself familiar with these theorems just from what he taught in class. So I...
  8. ichabodgrant

    Thevenin's and Norton's Theorem

    Hi. It's me again. Right now I have some troubles with Thevenin's and Norton's theorem. Here is the circuit. I have to find the thevenin voltage Vth and thevenin resistance Rth and solve the circuit when there is a 2000Ω resistor connected to A and B. Then, I try to solve it... First, for the...
  9. ichabodgrant

    Engineering Circuit with 2 voltage sources and 1 current source

    Here is the circuit. I have to find the voltage across each resistor and the current i1 and i2. My attempts are the following: By KCL, i2 + i1 = 0.1 A By KVL, 3 - 5 - 100i1 + 1100i2 = 0 ∴ i1 = 0.09 A, i2 = 0.01A ∴ Voltage across 100Ω resistor = 0.09 × 100 = 9 V, voltage across 1100Ω resistor...
  10. ichabodgrant

    Engineering Op-amp circuit analysis 2

    I know all these... the non-inverting and inverting op-amp... I simply can't distinguish them easily...so I prefer deriving the equations every time...
  11. ichabodgrant

    Engineering Op-amp circuit analysis

    R1 = 5R2 R3 = (1/5)R4 there might be some calculation mistakes...
  12. ichabodgrant

    Engineering Op-amp circuit analysis 2

    I think I was taught the superposition theorem... I just simply get confused at the line joining node D and E... As no current flow through these two nodes (or just 1 node as their potentials are the same), so current from C to D means from C to E?
  13. ichabodgrant

    Engineering Op-amp circuit analysis 2

    So are node D and E having same potential?
  14. ichabodgrant

    Engineering Op-amp circuit analysis 2

    Sorry.. I want to say V at E = V at D a typo
  15. ichabodgrant

    Engineering Op-amp circuit analysis 2

    Hi. I have moved on to the next question. There is something I am confused. The question wants us to express Rf in terms of R such that vo = -15vi. After doing the last task, I think I understand the flow of solving it. But here still exists a problem. My attempts and question are listed in...
  16. ichabodgrant

    Engineering Op-amp circuit analysis

    I solve it... I had never thought of using comparing coefficients... turns out to be not too difficult...Thanks everyone
  17. ichabodgrant

    Engineering Op-amp circuit analysis

    In the following circuit, compute the values of R1 and R3 in terms of R2 and R4, such that vo is always equal to v1 - 5v2. I have marked 3 nodes, A, B and C. v+ = v- as assumption for the op-amp. Consider node A. v- = v+ = v1 × (R2 / (R1+R2)) Consider node B and C. (v- - v2) / R3 = (vo -...
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