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I simulated a circuit in HSpice 2008. The problem is that the output waveform is not accurate and is segmented. Please see the attached picture.
I used smaller step in .tran analysis, but it does not correct:
.tran 1n 2u
This problem does not exist in Hspice 2003.
I understood what you mean, but I could not get the desired output.
I have two questions:
1. My circuit input is differential and the output is sigle-ended. How do I apply the input? I applied "ac=1 sin(0 1 1meg)" as the input voltage (in open-loop config.).
2. I putted a...
I am simulating a trans-conductance circuit (OTA). I want to obtain pulse response of the circuit.
So I applied a square waveform voltage as the input, then I see the output current.
My question is that may I compare the output current waveform with input voltage and then calculate the slew...
Hello every one
I want to calculate output current of differential pair circuit which is used as a OTA, but I could not obtain. I attached the related paper which claims From eq. (2)-(4) we can obtain the output current of eq. (5), unfortunately I could not obtain the result which they...
I can not use differential pair amplifier, because my desired output voltage should be single ended (one node).
In fact I want to realize the circuit which do what you said: Vout=0.5*(v1-v2) but not double ended.
To have better accuracy I will use your original circuit.
1. What do M2 and M6 do?
2. Why do you put M0,1,2,3? I guess you utilized them to have cascode structure and more accuracy, right? Should we connect all of their gate to GND?
Hi every body,
I need a simple analog circuit consist of only MOS transistors to do this:
Where V1 and V2 are DC voltages less than 1v. By the way the V2 can be negative e.g. the circuit should be work for (V1-V2)/2.
If you have idea by using resistors it works for me. I can...
Thanks for your reply, but as I said I know all of the expressions. I mean that how can I simulate the circuit (in Hspice)? I putted CMOS transistor level of OTAs, then if I apply iin1 ideally, since iin1= -io1, io1 should be equal to applied iin1, while it can be changed by its...
I studied a paper attached with this post . I have a question about Fig. 3 which is also attached where a topology to realize multiplier circuit has been presented:
How can we apply "iin1" to "EOTA1"? In the paper it is mentioned that "gmT1" has a direct proportion to "IBE1", when we change...
I want to draw the "gm" of the OTA circuit, since gm=Iout/(vin+ - vin-). Is it right ? If not, pls explain how I can draw the transcendence? In fact I want to demonstrate the linearity of the designed OTA by showing the gm curve.
How can I measure transconductance (gm) of a OTA ? or how may I draw transconductance of OTA in terms of input voltage variation?
I want to divide the input voltage difference signal by output current, but it doesn't allow because when vin=0, the gm is infinite !!
Hi every body,
I designed a new CMOS OTA which has high linearity as a voltage-to-current convertor. Also I utilized a technique in which "Iabc" has a direct proportion to "gm", i.e : Iabc=Kgm, where K consists of W/L of input transistors and some other constant parameters. By the way all of...