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Type: Posts; User: Tahmid

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  1. Replies
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    Closed: Re: Need for low input impedance

    http://obrazki.elektroda.pl/2839350300_1497500293.jpg

    Rp is the parallel resistance/impedance of your input current source, Rin in the input resistance/impedance of your circuit, which I've...
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    Closed: Re: 150W inverter schematic ?

    My guess would be that it uses an SG3525 (or similar PWM chip) and drives 2 MOSFETs in push-pull configuration. So the transformer would be center-tapped on the low voltage side. The high voltage...
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    Closed: Re: NMOS amplifier with PMOS current mirror

    Because of Id, Vout sits at some large-signal DC bias voltage, which is then used to bias the gate of the NFET. This is necessary since the AC coupling at the gate of the NFET will remove DC...
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    Closed: Re: 2 stage op amp with PMOS inputs.

    One possibility:
    For the first stage, consider using a folded cascode topology (with PMOS inputs) to get high gain with good voltage headroom. For the second stage, use a topology for low output...
  5. Closed: Re: effect of changing the value of L in 45nm Technology library?

    As erikl mentioned, instead of halving the width, you can double the length, for example. Keep in mind that as you change the length, you change ro (=1/gds) which changes roughly proportionally with...
  6. Closed: Re: IOT : Can anyone suggest, what are the works are going on in IOT from Analog IC s

    IoT relies heavily on sensors, which are analog in nature. Hence, any sort of analog signal conditioning circuit, integration of different sensors, etc before data is quantized seems like a natural...
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    Closed: Re: Diode connected NMOS transistor

    Adding on to what Calika mentioned:

    1) If VDS > Vth, you get the square-law relationship between IDS and VDS (since VGS=VDS). If VDS < Vth, you get subthreshold conduction -> you can think of the...
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    Closed: Re: Calculating Vout/Vin of a circuit

    Solve for Vout in terms of Vin by doing KCL at drain. That'll give you your required ratio.

    In your SSM, you have Ig going through Rs - Ig is current into gate, not into Rs.
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    Closed: Re: Calculating Vout/Vin of a circuit

    1) What is the Rs and why do you have it there?
    2) What do we know about Ig of MOSFETs at DC? (Zero)
  10. Closed: Re: [moved] NMOS amplifier design, parameters given

    That could be the DC operating bias point - eg for a single stage amp. Applying an input signal can then allow amplification of the AC signal.
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    Closed: Re: Operating regions of a transistor switch

    If operating as a switch, you go from saturation to cutoff (or other way round) as you mentioned. As Vbe increases, for a short amount of time, the transistor will be in active (linear) mode until...
  12. Closed: Re: [IC AMPLIFIER] Active Common-Source Amplifier

    The voltage at the gate is equal to the voltage of the drain. There is a current source from drain to source - so, this behaves like a resistor with resistance 1/gm (dependent current source...
  13. Closed: Re: NMOS amplifier design, parameters given

    That sounds like some sort of an on-chip amp. Are the IDS and VDS (40µA and 1V respectively) for the operating bias point?

    You need to figure out what topology to use based on the following...
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    Closed: Re: Calculating output resistance

    Note that M3 is diode-connected so that it's effectively a resistance. M1 is configured to be a common source amp, but M2 is configured to be a common gate amp.
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    Closed: Re: Calculating Vout/Vin of a circuit

    Replace the MOSFET with its small signal model. So you have a current source from drain to source, whose value depends on the transconductance as well as the gate-to-source voltage. You don't have...
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    Closed: Re: Converting A/D value to float

    The ratio in the parantheses would evaluate to zero here. You should write them as float:


    result = ( float ) variable * ( 200.0/5478960.0 )
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    Closed: Re: Current mirror with FETs

    If you see from the circuit I attached, there, the gate charges through R1 from the supply. This causes Vgs to increase since the gate is being charged.
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    Closed: Re: Current mirror with FETs

    At start-up, VGS increases from 0 to the required final value to pass the required Id.

    https://www.edaboard.com/attachments/120148d1439542740-current-mirror-eda.png
  19. Closed: Re: Can i install proteus and mikroC in ubuntu 15.4

    Use WINE. I had done something similar when using Ubuntu 10. something.
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    Closed: Re: What is this item on a circuit board?

    Enough information available here:
    https://en.wikipedia.org/wiki/Crystal_oscillator
  21. Closed: Re: Advantages of Embedded Linux Over Bare Metal PIC Code

    Firstly do you know which target MCU/processor you are running? If you are running eg a PIC32, there's no point in even thinking about Linux ... you can't run it. So, that's a starting point....
  22. Closed: Re: Advantages of Embedded Linux Over Bare Metal PIC Code

    Ignoring Linux and PIC and speaking in terms of generics, using an OS lets you focus on the application tasks/processes instead of you also having to perform task management. Just a simple example:
    ...
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    Closed: Re: What is the integration of square wave ?

    Integrating a constant gives you a linear relationship: ie integrating a constant k (dx) results in kx (+constant of integration). A square wave is just two constant levels (eg +1, -1). So, that...
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    Closed: Re: When does this function exit

    If you shift, you want to perform an arithmetic shift that preserves the sign (sign extension). You can bit mask the number after shifting it, and then use this result from there on.
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    Closed: Re: When does this function exit

    The loop body is executed every iteration. But when a return statement is called or executed, the function returns, thus exiting.
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