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Hi,
I have been trying to simulate a circuit in LT Spice to find out the open loop gain.
To my surprise, when I plot Vint, I get a negative value of the gain (in db). I am using a small signal ac source of 1V.
I am attaching the schematic herewith. Can anyone tell me why the gain is negative.
Is...
Re: FET Question
Hi,
Vgg is the output. Basically my intention is to see V1 = Vgg when V1 is negative and no voltage when V1 is positive. I am trying to use the Vgs(th) concept and for an enhancement mode , Vgs is anywhere around 1 to 4 V depending on the type of FET. My problem is when Vgs is...
FET Question
Hi,
I am using an N channel enhancement FET in my circuitry to ensure that I block positive voltages and allow negative voltages. I have tried to simulate the following circuit (attached). The Vgs(th) is 4V (for IRFL104). I am able to see an output voltage on drain eventhough the...
On Semi Multiplexer
Hi,
Lately, I am having issues with the MC74HC4051.I am unable to understand the reason for the drop of voltage from input to output whenever the appropriate channel is active. The drop is around 0.8V. I am having +5V as VCC and GND as VEE. No negative voltages.
The load...
regulate negative voltage
Hi,
Try using LTC1144. It gives around 50mA at 15V. Put a resistor divider network and get - 7V at the output but some current would be lost.
Also you could try putting a X'stor switch to get the desired voltage and current.
Thanks,
- Hemant
zener diode biasing
That's not how the zener will work.
All you need to do to trigger is to ensure voltage across zener exceeds 33V.
It is generally used to protect the circuitry against voltage surges.
Thanks,
- Hemant
Hi,
In case of power supplies, during a short circuit condition (i.e. Vo = 0V), is the excess current (until current limiting is reached) taken from within itself or the input battery which is the source of input voltage (Vin)?
Thanks,
- Hemant
Re: circuit function/purpose
The "R" in the equation is the ESR or the Equivalent Series Resistance of the cap. It is generally mentioned in the specsheet of the cap.
Thanks,
- Hemant
Re: Question on Op-Amps
Generally what I have noted is if a current rating is per amplifier then they mention that in the specsheet e.g LT1638 else it's a package rating.
Thanks,
- Hemant
Question on Op-Amps
Hi,
I have a question on Op-Amps. Generally we find dual or quad op-amps an a IC. In the specsheet, there is a rating mentioned for the max output current. Does that signify the max output current from the package or per amplifier?
Thanks,
- Hemant
Hi,
I have a signal that comes out of the op-amp circuitry working on 15V power supply. Since I am supposed to use in the programming chip, I have to reduce the voltage level.
Now the output from CPLD is supposed to go to the circuitry operating at 15V logic level. How do I accomplish this. Any...
I would like to know the advantages or the disadvantages of an opamp used in the feedback or feedforward circuitry. Also, is there a change in gain when opamp is used in the above two configurations.
I have attached an example which shows a feedback and feedforward circuit. The values of the...
Re: Capacitor value needed
Thanks
- Hemant
Added after 5 minutes:
The cap is being used for dc applications. In the sense that if the voltage drops due to noise or something; it can provide the necessary oomph to the supporting circuitry.
The reason for asking the cap value was to ensure...
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