BradtheRad
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Today, 07:56vivekroy replied to a thread mosfet as a switch in 28nm technology in Analog Integrated Circuit (IC) Design, Layout and FabricationIf you increase W, you decrease the resistance of the switch. If you increase L, then you increase resistance but at the same time decrease leakage...1 replies | 51 view(s) -
Today, 07:42This is the standard Doherty impedance that you see. Rp=Rl' / (1 + I_carrier'/I_peaking) Where I_carrier' is the current coming out of the...1 replies | 37 view(s)
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Yesterday, 22:25You're right of course. It's just a fun thing to try if we like to see the principle at work (moving coil past a magnet generates electrical signal)....4 replies | 254 view(s)
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Yesterday, 14:04BradtheRad replied to a thread Circuit to pulse from 1v to 1.1v repeatedly. in Analog Circuit DesignFrom a 1V supply the astable multivibrator produces 1.35V peaks at the capacitors. I'm not sure if this can be adapted to your purposes but the...7 replies | 247 view(s)
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Yesterday, 13:05vivekroy replied to a thread How to know Proper Values for ZL and ZS , Load Pull and Source Pull in ADS in RF, Microwave, Antennas and OpticsI used to get values like 20-25 ohms at 28GHz for a SiGe transistor (after layout). Most of it used to come from the internal base resistance. I have...5 replies | 251 view(s)
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Yesterday, 07:01vivekroy replied to a thread fully differential opamp' s output is not symmetrical in Analog Circuit DesignTake a simple RC circuit and give it a square wave periodic input. It will take sometime for the output to settle to a periodic waveform. Its similar...4 replies | 213 view(s)
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Yesterday, 06:55vivekroy replied to a thread Mixed Signal IC Grounds in Analog Integrated Circuit (IC) Design, Layout and FabricationMIM caps are high Q capacitors. The inductance in the supply path (trace inductance) + decoupling capacitors can form a series LC tank. To make sure...7 replies | 376 view(s)
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Yesterday, 06:52vivekroy replied to a thread How to know Proper Values for ZL and ZS , Load Pull and Source Pull in ADS in RF, Microwave, Antennas and OpticsFor max PAE, the I would think that the gain needs to be as high as possible and therefore you need to conjugately match at the input. With the...5 replies | 251 view(s)
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Yesterday, 06:07vivekroy replied to a thread Stability of a circuit and its role in design steps in RF, Microwave, Antennas and OpticsI see it as well. The losses in the matching network cause the amplifier to be stable. This is what I did for single ended amplifiers: 1. Design the...4 replies | 396 view(s)
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Yesterday, 03:32You can talk into an ordinary speaker and it acts as a microphone. If you wish to experiment you can place a coil of wire next to a magnetized...4 replies | 254 view(s)
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21st July 2019, 18:35vivekroy replied to a thread What's the difference between stacked and cascode configurations? in Analog Integrated Circuit (IC) Design, Layout and FabricationThis is cascode nevertheless. The capacitor does not serve any purpose here. See the following figure. In cascode, C_CAS >> C_GS and...4 replies | 204 view(s)
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21st July 2019, 08:13BradtheRad replied to a thread Does Solid State Marx Generators actually work? in Analog Circuit DesignBy trying a while longer I managed to make a workable simulation (in theory). Although this thread has the name Marx generator, the topology...81 replies | 2795 view(s)
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20th July 2019, 17:04BradtheRad replied to a thread MOSFET Speed and power tradeoff in Analog Integrated Circuit (IC) Design, Layout and FabricationYour equations were set off by a 'tex' html tag. Apparently the system didn't know how to interpret this, so it defaulted to a logo from our image...5 replies | 291 view(s)
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20th July 2019, 14:27vivekroy replied to a thread MOSFET Speed and power tradeoff in Analog Integrated Circuit (IC) Design, Layout and FabricationI don't know why the equations came as elektroda.pl :( But here is the answer with the expressions: For a long channel MOSFET, the f_T =...5 replies | 291 view(s)
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20th July 2019, 11:06BradtheRad replied to a thread Does Solid State Marx Generators actually work? in Analog Circuit DesignWhen you switch all the capacitors to join in series, their voltage differentials add up to extreme levels that can destroy components. Node...81 replies | 2795 view(s)
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19th July 2019, 20:07Yes. I had forgotten the maximum range was around 5MHz. By bad.8 replies | 271 view(s)
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19th July 2019, 18:31A modification of FvM's suggestion would be to use two 555 timers, one tuned to 27MHz and the other to 1/800 Hz and then do a logical AND of the two...8 replies | 271 view(s)
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19th July 2019, 16:16vivekroy replied to a thread Oscillator jitter transient simulatin in spectre in Analog Circuit DesignYou are contradicting your original question. In the original post, you mentioned I am very confused now about your question. How have you...13 replies | 406 view(s)
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19th July 2019, 09:33I once installed Linux on my Compaq laptop (to a re-formatted hd). Things worked to the point where I saw the desktop open and appeared normal....3 replies | 158 view(s)
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19th July 2019, 09:03vivekroy replied to a thread Mixed Signal IC Grounds in Analog Integrated Circuit (IC) Design, Layout and Fabrication1. Separate analog and digital supplies and grounds. I believe you are already doing it. 2. Place separation between analog and digital blocks and...7 replies | 376 view(s)
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19th July 2019, 08:57Check out this link that describes the impedance transformation brought about by the capacitive divider. ...2 replies | 187 view(s)
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19th July 2019, 06:38A capacitor by itself creates current lead (90 degrees). By adding a second series capacitor, and tapping between them, these effects result: *...2 replies | 187 view(s)
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18th July 2019, 19:34vivekroy replied to a thread what is the significance of the transit frequency and maximum frequency of oscillatio in RF, Microwave, Antennas and Opticsfmax is the frequency where the maximum gain of a transistors (maximum gain --> conjugate matching at BOTH input and output) becomes zero. Beyond...5 replies | 265 view(s)
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18th July 2019, 16:03vivekroy replied to a thread Oscillator jitter transient simulatin in spectre in Analog Circuit DesignAs pointed out by others as well, its not jitter and lets not refer to it as jitter anymore to avoid confusion. You should also specify values for...13 replies | 406 view(s)
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18th July 2019, 15:59vivekroy replied to a thread Output power, Drain Current versus multipliers in Analog Circuit DesignYou would get 8 times the drain current at DC no doubt. Now imagine you have managed to bias everything in class A. Then your current swing will be 8...2 replies | 181 view(s)
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18th July 2019, 08:51For a tutorial, here is a simulation containing the chief components of a buck converter. It is animated and user-interactive (you press the...14 replies | 605 view(s)
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18th July 2019, 06:17vivekroy replied to a thread MOSFET Speed and power tradeoff in Analog Integrated Circuit (IC) Design, Layout and FabricationFor a long channel MOSFET, the f_T = \frac{1.5\mu}{2\pi L^2}(V_{gs}-V_{th}} If you increase the overdrive, then your transit frequency goes up. But...5 replies | 291 view(s)
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18th July 2019, 05:57vivekroy replied to a thread Oscillator jitter transient simulatin in spectre in Analog Circuit DesignThat is the numerical garbage from the simulator that you are seeing and should not be considered as the jitter. You can tighten simulator reltol and...13 replies | 406 view(s)
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