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hello every body
i know for measuring THD(%) of Vout, I must type THD=thd_finc(Vout). I do it and THD=-40dB is obtained.
** now I want to plot the montcarlo of THD. please learn me what i do?
please step by step and in simplest express.
hello BigBoss
None of them. they worked in HSPICE 0.18 µm standard CMOS Technology.
is it important?
i uploaded this paper in this thread. can you see?
you have right pancho_hideboo...
first I must thank to you for your good help with pictures for plotting Gm in ADS.
My question was contradictory with title of this thread, "Simulate linearity parameters of a fully differential OTA". ok.
but i said this to "we having a really example with...
to FvM:
this is a test circuit.
i upload pictures and the pdf of article in this post...
my OTA has two output node. but in this article OTA has one output(single ended). i want to simulate this paper to evaluate the structure of out put. if i can obtain THD=-70, as mentioned in table 1 of...
this is my paper that i want to simulate.
"A Novel Tunable Transconductanse Amplifier Based on Voltage-Controlled Resistance by MOS Transistors-2006"
first I put a 1 Ohm resistor between output node to Ground. THD= -29dB obtained!
this is wrong. in table 1 of this pepar THD=-70 dB for (Vp-p=0.2...
I am sorry. I can not tell you my really purpose...:sad: :bang:
I know each amplifier must drive a load. ok. this is clear.
my question is how to test an OTA. papers don't tell what is the properties of they load for testing linearity of OTA. they just report linearity values in their tables...
i want use OTA for Gm-C filters. I want to measure Linearity parameters of my proposed OTa. what is the conventional method that used in valid articles?
what are they doing in output nodes of OTA when they report parameters of their proposed OTA in a table?
There is no next stage. only one OTA.
in some papers the authors report The THD of Only theirs proposed OTA. then use this transconductor in a filter. but I have no filter.
i want to khow for example when they tell us THD of OTA is -40dB or THD of filter is -50 dB, exactly they point to...
hello all friends
i want to simulate linearity parameters such as THD, IM3, IP3 of an OTA with two output node (in other word this is fully differential).
my problem is in the output nodes.
1- I have two node in output. what I insert to this nodes?(R or C) with how much value?
2- what is...
wooooo..
you learn me very thinks pancho_hideboo ..
yes i am wrong. thank you for inform me and for your important time to guide me.
but a problem..
* in your picture that the transistores are bipolar, The OTA is single ended.
* in picture that you draw in ADS window the OTA is fully...
Why wrong? :-(
- I want plot the Gm of hole OTA. my OTA has 8 mosfet.
- Gm is the Gain of transconductance= iout/Vid.
- Vid is the different between input gates voltage of mosfet. and iout is the current passing from the two nodes of output mosfets. (fully differential output)
- plotting Gm vs...
thanks a lot Dear pancho_hideboo and FvM.
with your helps finally I could plot my desirable curve. i explain this in ADS for other friends:
1- we must use two DC voltage. put a DC supply in Gate of M1 and another DC supply with opposite polarity in Gate of M2. (M1 & M2 are differential inputs)...
pancho_hideboo! your guidances are very useful for me :clap:.
about the n.2 question:
are you think I put a resistance between output mosfet Drain and ground?
No..!
i have a fully differential OTA ok?
thus I have two drain. one drain is Vout1 and another is Vout2.
now i put a resistance...
thank you pancho_hideboo for your good response.
1- you mean that i use two DC voltage? put a Dc supply in Gate of M1 and another DC supply with opposite polarity in Gate of M2?
2- is it true that i put a resistor between drain of M1(vo1) and drain of M2(vo2)? and now use the current of this...
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