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• 15th February 2019, 15:58
LvW, from post#1 it is a Sallen-Key, where R1=R2, so Q is determined by the ratio of C1 and C2: Q=0.5*sqrt(C1/C2), and they are equally 100pF, so Q...
46 replies | 717 view(s)
• 15th February 2019, 14:40
Hmm, I should be more careful with reading, thank you by the way. My last recommendation is a 6th order "Linear Phase with Equiripple Error of 0.05°"...
46 replies | 717 view(s)
• 15th February 2019, 14:09
Don't you want to show your drawn circuit rather with the CMFB? With DC annotations of node voltages and operating points, to see why not working....
6 replies | 206 view(s)
• 15th February 2019, 12:15
I don't see this criteria there, however it makes sense, KlausST mentioned phase shift earlier maybe, but Butterworth doesn't seem too bad I think....
46 replies | 717 view(s)
• 14th February 2019, 23:26
If the Q<0.707 the roll-of happens before the cut-off frequency, this is why you have seen bigger attenuation, but the calculators are correct. Only...
46 replies | 717 view(s)
• 14th February 2019, 21:17
I have attached a link about Ahuja above (page 10-11), there is a similar small-signal model, basically the same just with other cascode arrangement,...
15 replies | 580 view(s)
• 13th February 2019, 22:52
Yes, these limits probably can answer the phenomenon, thank you very much for the clarification. I really didn't know that the PDK contain them, I...
3 replies | 134 view(s)
• 13th February 2019, 12:45
Possible way to implement adjustable filter is the Gm-C filter. There are some discrete OTA from Analog Devices where with the bias current the...
17 replies | 341 view(s)
• 12th February 2019, 22:02
You have to know the minimum load capacitance too. Hard to estimate a real case, depends on wire length, minimum load gate numbers for example.
1 replies | 123 view(s)
• 12th February 2019, 21:46
Partly true. The exception is the Butterworth characteristic, where the normalised cut-off frequencies for any order and for every stage is 1. It...
46 replies | 717 view(s)
• 12th February 2019, 20:18
Filter design tables contain the necessary Q and normalised cut-off frequencies for the required order and characteristic. You should use one to...
46 replies | 717 view(s)
• 12th February 2019, 20:09
Wow, your questions fall apart. Please think about them before multiple post, otherwise you confuse us and yourself. Possible answers: 1, how do...
9 replies | 264 view(s)
• 12th February 2019, 18:35
I don't know how can a LED turn on with such a high frequency, I think a mixer + 10MHz oscillator + low-pass filter + amplifier rather capable. ...
5 replies | 285 view(s)
• 11th February 2019, 15:40
Hello everyone, I don't clearly understand the difference between average / RMS / peak electromigration (EM) results of ANSYS Totem. When I...
3 replies | 134 view(s)
• 11th February 2019, 12:14
That zero never caused an issue for me as I remember, if it is well-known I think I am under-educated. But it doesn't seem unconditionally true the...
15 replies | 580 view(s)
• 11th February 2019, 11:39
True, DC ohmmeters and multimeters have some considerations, non-linear device measure is not possible for example, but I have learnt that Z = R +...
9 replies | 264 view(s)
• 11th February 2019, 11:19
1, If you measure a simple resistor with an ohmmeter you will see its impedance, which has no reactance. Everything is impedance measure. When you...
9 replies | 264 view(s)
• 7th February 2019, 10:54
In Ahuja there is no feedforward path for the capacitor, because the source terminal of M10 has low voltage gain (virtual ground). Thus teoretically...
15 replies | 580 view(s)
• 6th February 2019, 23:21
The final output of the PA isn't matched sometimes? I mean where the antenna or transmission line (cable) is connected? I haven't got too much...
8 replies | 540 view(s)
• 6th February 2019, 19:36
When the impedances aren't matched some of the source power can come back from the load. This is called reflection. So reflected power won't be...
8 replies | 540 view(s)
• 6th February 2019, 18:18
I think LED is used to detect reverse polarity, and prevent breakdown of Q1 base-emitter junction with reversed voltage. It is not useful to regulate...
26 replies | 526 view(s)
• 6th February 2019, 17:11
Best is more research. 5GHz VCO is a serious circuit, if you don't find a good solution from an article or a book, I think it has a low chance...
6 replies | 326 view(s)
• 6th February 2019, 12:42
No, LED cathode is closer to positive potential than anode. It won't light. Please, add the arrow to the MOS to mark its type, which has to be...
26 replies | 526 view(s)
• 6th February 2019, 00:32
IRFP9140 is a PMOS, so feedback is positive. And symbol is bad too. https://www.vishay.com/docs/91238/sihfp914.pdf Vin- of the OPAmp should be...
26 replies | 526 view(s)
• 5th February 2019, 17:11
Sorry, are you using an NMOS or a PMOS at the output? Because by the symbol it is an NMOS, and then the Vin+ and Vin- aren't swapped, but then the...
26 replies | 526 view(s)
• 5th February 2019, 15:52
D5 LED is not just reversed, but Veb of Q1 won't be enough to generate light. U1 is not a comparator, it is an OPAmp. It has to be frequency...
26 replies | 526 view(s)
• 4th February 2019, 16:06
Instead of fuses use transmission gates. https://en.wikipedia.org/wiki/Transmission_gate
2 replies | 144 view(s)
• 4th February 2019, 12:19
Probably you could, but figure reveals the main issue of the Johan Huijising book. He sometimes uses dots at crossing wires, sometimes not on the...
8 replies | 344 view(s)
• 4th February 2019, 10:44
Meaning of fully differential is obvious I think, differential input and output. For this in the 1st stage you have to disconnect diode-connections...
8 replies | 344 view(s)
• 3rd February 2019, 17:32
a, just estimate some wire lenght, how far is the mixer/antenna pin from the LNA, supply rails distance from signal path, and extract or calculate...
5 replies | 303 view(s)
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