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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 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...
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...
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...
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...
I want to study on the subject of "gm/Id design". Do you know good source or book.
I found this useful book:
the gm/id methodology a sizing tool for low-voltage analog cmos circuits
Does anyone have this book and share with me ?
I have designed an analog circuit, then I applied a square pulse to the input and get the response at the output. For the sake of speed examination, I measured the propagation delay for the output (low to high & high to low delay).
Is it right to measure the propagation delay for the...
I want to show the accuracy of a circuit against process variation by histogram, where zero is putted on the middle of that. Therefore negative and positive percentage of error are defined.
Negative (positive) sign for the errors which are smaller (larger) than ideal output...
Hello every one,
I have a question about a symbol.
We know that, complementary of a digital signal is shown by bar on that signal.
How about an analog signal. Suppose that we have a reference current of Iref, the output current is Iout=out1. Now we would like to have Iref-Iout. How can we...