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Hi
I want to simulate a VCO using CMOS, and I'm trying to simulate a 5 stage ring oscillator in HSPICE first.
I'm not getting any oscillations even though I've specified an initial condition, and the output voltage appears to settle somewhere between VDD and 0 after some initial spikes.
This is...
Thanks for the explanation!
I was trying to visualise the triggering operation considering the behaviour of the three junctions, but I think I'd better stick to the two transistor analogy :-)
Didn't get what you mean by receiver frequency. The receiver won't generate a signal on its own; it will just receive signals coming from the transmitter.
You can simply connect a signal generator to the transmitter if you don't have a microphone. Just be sure to check the frequency; usually...
What exactly does happen when an SCR is triggered? Books explain the process by saying that the reverse biased middle junction breaks down. What I don't understand is how the voltage across it decreases to zero when an avalanche breakdown has occurred.
You can connect a standard signal generator directly to the transmitter and observe the waveform on an oscilloscope connected to the receiver.
The transmitter-receiver pair will probably be tuned to a particular frequency though, which should be given in the datasheets.
Hi
This may be an elementary question, but I haven't found a convincing answer in any reference book.
Why does the voltage across an SCR suddenly decrease after the forward break-over voltage?
As far as I understand, the middle junction breaks down at that voltage. Why does the voltage across...
Thanks everyone!
They taught us control theory at college at around the same time as this, so i tend to visualise a feedback amplifier as its canonical form :-). The standard equation for a feedback system is A/1+AB. In books, to get a similar expression, they change the type of amplifier...
What I don't understand is why a particular amplifier is associated with a particular topology. Is it just to make calculations simpler?
e.g. When represented by blocks, why does a series shunt configuration, have an amplifier block with a voltage gain? Why is it not shown as, say a current...
Hello!
I had a few questions about feedback amplifiers.
Why do the four types of amplifiers each have a specific type of feedback? For e.g. why is a current amplifier always said to use shunt series feedback? Is there any particular reason for this? I've searched various books for this, but...
Thanks everyone!
Yes I wanted to make a variable supply with a minimum voltage of 5 V and had no shortage of 7805s :-D
I guess i'd be better off using a 317. (A 7812 won't be able to give a voltage below 12 V, right?).
I saw a similar circuit to the one which Raza posted earlier (using a 7805)...
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