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Type: Posts; User: circuitking
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15th September 2019, 18:45
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Closed: What happens to output power and 3 BW in this circuit
Hi, I calcaulated L and C values for a butterworth filter, to get 3 dB BW of 50 GHz and attenuation of 6 dB at 60 GHz. Next, I gave 10 dBm input power and I got the expected result.
Again I took... 
15th September 2019, 03:15
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 395
Closed: Re: How to calculate bandwidth for this circuit, including lower and higher cut off f
True, I didn't connect gate capacitors. Then how do we call this structure, cascode or stack? So if I dont connect those gate capacitors what changes would be there in performance parameters?

12th September 2019, 21:27
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 4
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 395
Closed: How to calculate bandwidth for this circuit, including lower and higher cut off freq
Hi, for the attached stack structures I already added the capacitors after doing simplifications. I was thinking I should multiply the capacitance with the resistances I marked.
1. Is it correct,... 
11th September 2019, 12:43
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Closed: In PA, if the bias is VDD then how can swing be 2*VDD with inductive load
Hi, From the below link I read that when we have inductive load, for example, in CS amplifier the output voltage swing can be (2*VDD), if VDD is the supply voltage
... 
11th September 2019, 12:35
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Closed: Re: What is the difference between BVDSS and BVDS
Thanks. How is substrate breakdown voltage is denoted, any short form? I am looking for its value in the PDK but I find it nowhere.

9th September 2019, 01:56
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Closed: ADEXL: 2 tests have a same variable but it is constant for test1 and swept for tes2
Hi, I have two tests (test1 and test2) and one global variable, which is being swept. These two tests have a identical variable (Say X). I want to keep X as a constant value for test1 and a sweep...

8th September 2019, 13:18
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 370
Closed: Re: Help on Ocean scripting: run one analysis and use that results in another
You wrote this "new_var" and in the link I gave, the author says "and that the design variable is a global variable which is used by the second test but not the first test".
I am not sure why he... 
8th September 2019, 12:52
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 370
Closed: Re: Help on Ocean scripting: run one analysis and use that results in another
Nice.Thanks vivekroy. Tried with ADEXL, it does the job.
Also I found found this using the keywork "calcVal()" you mentioned.
... 
6th September 2019, 21:59
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 8
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 370
Closed: Help on Ocean scripting: run one analysis and use that results in another
Hi, I know I need to learn ocean scripting but I just need a fix on this at the moment.
I want to run a simulation which has two analysis, but the second analysis gets one of it's desvar() value... 
6th September 2019, 21:50
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 304
Closed: Re: What is the difference between BVDSS and BVDS
I know, in general, BVDS means drain to source breakdown voltage and I wanted to know how substrate breakdown voltage is represented. While I was in search of that I came across BVDSS, which I don't...

6th September 2019, 12:22
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 304
Closed: What is the difference between BVDSS and BVDS
Hi, Which is Drain to source breakdown voltage and substrate breakdown voltage. Can you aslo elaborate what they are exactly.
Thanks 
4th September 2019, 22:45
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Closed: In distributed amplifiers, is it total input capacitance of the gain stage or Cgs
Question:In distributed amplifiers, is it the total input capacitance of the gain stage or just the Cgs of the input transistor that gets absorbed into the artificial transmission line?
Hi, so far... 
3rd September 2019, 23:59
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 5
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 471
Closed: Re: How do you choose input power while doing loadpull?
I didn't understand much whenever you mentioned about SKILL scripting language. Now it started making sense to me, I should learn this.
   Updated   
Yes I was doing that, I could get... 
2nd September 2019, 14:12
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 245
Closed: curve fitting for input and output matching
Hi, In this video (https://www.youtube.com/watch?v=3l6Xmtg558w) he says he used curve fitting for input matching. I came to know for broadband matching I should deal with impedance curves rather than...

2nd September 2019, 12:45
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 5
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 471
Closed: Re: How do you choose input power while doing loadpull?
Thanks, I am trying to do this at different frequencies. Is there any way to automate this in Virtuoso ADE L?

1st September 2019, 15:17
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 381
Closed: How to realize inductor from transmission line (microstrip and CPW lines)
Hi, I am reading the paper "Broadband Impedance Matching Network for RF Power Amplifiers" and came across idea of realizing Inductor using microstrio line.
155270
(1)As per the above formula, I... 
31st August 2019, 23:29
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 471
Closed: How do you choose input power while doing loadpull?
Hi, usually we would like to know what is the output power(Pout1dB) at input 1 dB compression point (Pin1dB). Does this mean first I find Pin1dB and then do the loadpull at this input power?...

31st August 2019, 12:25
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Closed: Re: How to measure the input reactance and output reactance of a MOSFET/gain stage
Then how do you find the input/output capacitances ?
   Updated   
So you suggest I use Zm instead of ZP. To me also Zm makes sense. 
24th August 2019, 23:02
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Closed: Re: How should be Pin1dB less or more compared with Pout1dB?
I should say I need at least 20 dBm output power at P1dB(out) that means I can have 20 dBm even before reaching P1dB(out).

24th August 2019, 22:56
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Closed: Re: How should be Pin1dB less or more compared with Pout1dB?
Thanks Correct. So our goal should be to increase Power Gain as much as possible, on the hand can I also say that Pin1dB should be as less as possible?
   Updated   
Oh I didn't think in... 
24th August 2019, 21:01
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Closed: How should be Pin1dB less or more compared with Pout1dB?
Hi, Suppose If I want 20 dBm output power @ 1 dB compression point, don't we need to consider how much power we need to give at the input? In the sense that Is It appropriate to give input power of...

24th August 2019, 10:59
Thread: Loadpull for Narrowband and Broadband
by circuitking Replies
 5
 Views
 359
Closed: Re: Loadpull for Narrowband and Broadband
I should take loadpull at various frequencies in the band and design a matching network (MN) for one of those Zopts. Then, tune the matching network component parameters such that it may be close to...

23rd August 2019, 23:23
Thread: Loadpull for Narrowband and Broadband
by circuitking Replies
 5
 Views
 359
Closed: Loadpull for Narrowband and Broadband
Hi, I have been looking for a proper answer this question but I didn't find any proper answer. For narrowband applications, we perform loadpull at center frequency and matching accordingly But how...

21st August 2019, 12:22
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Closed: How is the maximum inductor value in a technology process is determined
Hi I came to know that the maximum value that can be achieved in a technology process is restricted. Could someone eloberate on this. How would I know what is the maximum inductor value that can be...

21st August 2019, 12:01
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Closed: How to plot Pout @1 dB compression point versus frequencies
Hi I want to plot 1 dB compression point versus frequenices. My goal is to plot Pout at 1 dB compression point Versus frequency. Is there any function in virtuoso calculator that picks the power @ 1...
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