BradtheRad
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Yesterday, 22:31BradtheRad replied to a thread Possible water damage inside keyboard in Service Manuals, Requests, Repair TipsYour photograph has labels on the pcb telling what a key does (ctrl, alt, cap, tab, z, a, q, etc.). It's not clear what is the mechanism that makes...1 replies | 59 view(s) -
Yesterday, 15:05vivekroy replied to a thread LC VCO with Capacitor filter, what is the cap doing? in Analog Integrated Circuit (IC) Design, Layout and FabricationA. Mazzanti and P. Andreani, "Class-C Harmonic CMOS VCOs, With a General Result on Phase Noise," in IEEE Journal of Solid-State Circuits, vol. 43,...6 replies | 337 view(s)
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Yesterday, 14:24vivekroy replied to a thread How to generated different bit patterns in Cadence Virtuoso in RF, Microwave, Antennas and OpticsWhy not use the vector file available in Cadence? I found this nice webpage from Columbia: https://www.bioee.ee.columbia.edu/courses/cad/html/vec.html1 replies | 51 view(s)
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Yesterday, 14:16It serves as a starting point. It really depends on your frequency of operation. A nice 'textbook' on the design of Doherty power amplifiers was...3 replies | 89 view(s)
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Yesterday, 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 | 81 view(s)
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Yesterday, 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...3 replies | 89 view(s)
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22nd July 2019, 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)....5 replies | 286 view(s)
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22nd July 2019, 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...8 replies | 284 view(s)
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22nd July 2019, 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 | 265 view(s)
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22nd July 2019, 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 | 225 view(s)
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22nd July 2019, 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 | 385 view(s)
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22nd July 2019, 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 | 265 view(s)
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22nd July 2019, 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 | 403 view(s)
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22nd July 2019, 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...5 replies | 286 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...5 replies | 217 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...85 replies | 2851 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 | 293 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 | 293 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...85 replies | 2851 view(s)
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19th July 2019, 20:07Yes. I had forgotten the maximum range was around 5MHz. By bad.8 replies | 273 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 | 273 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 | 407 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 | 165 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 | 385 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 | 267 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 | 407 view(s)
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