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63 Threads found on edaboard.com: Internal Capacitance
Hi all, I attach a schematic with this message (the highlighted part is what my question is about). Its an AM radio receiver circuit. The PNP common collector BJT is responsible for rectifying the AM modulated signal and then its sent to RC filter stage to filter out the information signal. My question is what is this capacitor
thanks
almost all trannies have some internal capacitance in real time and in off mode they can be used effectively as a capacitor without furthur ip we can't be more helpful in pinch off region there is a probability of using MOSFET as a constant current source but they need some external biasing for effective usage as current source
how to drive the reset gate of charge coupled devices (CCDs) ? because the gate of CCD is capacitance, so the driver must strong enough. there are some driver components available. e.g. EL7156, ISL55110 etc. however, these components have much larger internal capacitance itself. e.g. EL7156(80pF), ISL55110(135pF). the (...)
I think oscillation conditions are not suffciently satisfied because of insufficient feedback capacitance of the transistor because as I saw there isn't any external feedback elements and your OSC works with internal Ccb capacitance additional to, since this circuit will present some negative input resistance when you look at through base,t
Hi, I am simulating an amplifier in HSPICE. I am using the amplifier in the form of a subcircuit. I need to find out the capacitance of an internal node in this circuit - is there a command in HSPICE to do this? I am familiar with the .print CAP command, but how do I use this for a subcircuit?
That?s a schematic of a class E amplifier. It consists of a IRFD110 MOSFET transistor, a shunt capacitance Co (the transistor internal capacitance), a series L2C1 circuit, a Pi-Network filter (C2/C3, L3, C4) , R2 resistor, antenna . The shunt capacitor Co is made up by the internal output capacitance (...)
Circuit will amplify the thermal noise filtered by xtal with fundamental and harmonics and amplify signal to collector tuned fundamental with high gain where phase shift is 180deg with feedback from internal miller capacitance. (CE) THis appears to be series mode osc. Parallel mode might use Xtal in CE feedback path. eg >[URL="talkingelectr
my understanding is this ramp up current requirement is not for the configuration...its for the initialization FPGA which you have to make sure to avoid any erroneous behaviour..... you can relate it to surge current in a capacitor......its something like charging up the internal mosfets(or the equivalent capacitance seen by the power supply) inst
Hi, I'm struggling with the aspect of internal capacitance of the mosfet, the pathway to remove the charge is required and thus I've added a resistor in parallel with the capacitor (colored in red) but I've no clue how to determine its size therefore would you be able to provide some feedback on that issue
the following is the internal schematic of port pin of atmega8 ... please explain me why we use a capacitor here... thanks in
Actually the right way to say (using your words) is: "most of the CHEAP AND FOUND ON THE NET frequency modulator use transistor az modulator instead of PIN or Varactor diode". As was stated, a good frequency modulator would use varactors, and do not modulate the internal capacitance of the transistors, which are hardly affected by the transistor b
I fear, I don't exactly understand the problem. The 400 MOhm specification suggests a voltage source with (high) internal resistance, e.g. a pH electrode, not a pure capacitive source impedance. In contrast to a pH electrometer, which is basically a high impedance DC amplifier, a capacitive source would always require some kind of AC signal pro
Apparently, he's behind the internal power dissipation capacitances of the design. Honestly, I don't know if Altera's HSPICE libraries are modelling them somehow. But you should be able to determine this by setting up test designs with different amount of toggling registers and LEs and compare the core supply current. However, if the HSPICE librari
The resistor is required to discharge the capacitor It's not exactly required for discharge. But without it, the switch contacts may be possibly welded or at least excessively weared with higher capacitance values. Using an electronic switch, it's internal resistance is mostly sufficient.
From my experience resistor on reset line should be > 10K, capacitance could be couple of uF but need to be disconnected for programming (some jumper). BTW, the chip has internal brown out detection so it's not necessary to use external reset . The brown out detection plus a good software delay in the beginning of the main routine work better than
It will work, but you will get also parasitic FM modulation (due to internal capacitance of the transistor which is part of the resonant circuit). To get just AM modulation an easy way is to add a transistor buffer after the oscillator and modulate in amplitude its supply voltage using a transformer (or a transistor mounted as a regulator).
The "noise" required to start an oscillator is internal noise, not external. Your "quiet" environment isn't the problem. The CS5528 data sheet is quite poor and gives no information about connecting a crystal that I can see. It is quite common for 32kHz clocks to need quite a bit of capacitance - from 20pF to 50pF from both sides to ground.
To be more precise the Negative Resistance Oscillator (or negative-conductance whatever you want to be, gain or loss) could be seen as a Colpitts oscillator, with internal transistor base-to-emitter capacitance, and collector-to-emitter capacitance acting as a voltage divider. This is the reason in this kind of oscillators can be used only (...)
If you are referring to 8T as just a 6T cell with an extra read buffer (inverter), then the SNM is the same as 6T. You can use the Seevinck method in SPICE (JSSC 1987) since the output buffer has no effect on the internal nodes aside from added capacitance. If the cell core is ANYTHING other than cross coupled inverters, you need to be careful