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Strange resp.
Hello,
if your frequency source is f1, the time step of simulator must > 1/(2f1) (Nyquist theorem).
So f1=100MHz, like your circuits, the time step must be > 5nsec.
Kind regards.
transistor switch
I'm agree with electronics_kumar with the notice that on saturation region the output will go to 0.2V,if u take the output on the collector, so u must split the resistance on the collector in two resistance, so that on saturation R2*Ic_sat=2.5V...
see the attchement..
regards
collpits oscillator in multisim
Hi...
i think knowing the reason for which your simulation don't start!!!
Obviously we start from the point that the circuit gets the Barkausen conditions....
u should verify these conditions opening the loop in a good point and verify that they are fulfilled...
Hi,
your choice is correlated about the NF and gain that u need (really IP3 could be important too). At the higher frequency band (6GHz for u), more gain u need higher the transition frequency must be.
Philips bjt, like BFG425W could be good (ft=25GHz),
but u could use BFU510 or BFU540 Philips...
Hi,
if u visit the Infineon site:
https://www.infineon.com
u can find the right varicap for your application.
Varicap like BB831, BB833, BB837 and BB857
are used for SAT application, until 2.5GHz, with
your specifications about capacitance range and maximum voltage applicable....
The best for me...
Hi...
One non constant envelope modulated signal has information into its phase and amplitude (AM).
So if u use a non linear amp, like a class C amplifier
that works in saturation, the signal's envelope will be flatted and the information that was on the envelope lost. Another problem is that u...
Ultrawideband LNA
hi...
i have done in the past some large band amplifier
and i have seen that feedback amplifier are the best.
Usually it's preferible to use low loss components, so inductance (for example inductance emitter degeneration) or transformer (emitter out /base input) for getting...
mixer ic
Hi..
if u visite this site:
www.minicircuits.com
u can find many kinds of double balanced mixers for your application,
with differents OL levels and packages,
regards
amplifier design
I use Microwave Office every day...
if u give me your mail i can give u same templates or give some help for designing your amplifiers..
i have designed lumped and mixed lumped/microstrip low noise, low level amplifiers up to 1GHz....
alex_vettoriale
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