PRF protection
PRF protection
(OP)
Hello,
I have a pulse repetetion frequency protection circuit (PRFPC)project. Actually I designed a five order active filter (by using two LM741) for this work. My purpose is to attenuate the input voltage of the PRFPC with the multiplied of 0.25 (If Vin=4V=> Vout=1V) at 4kHz, which is a low-pass filter.
Although the circuit performance is perfect for high duty cycle operations (>%10), it is not good for low duty cycles (<%1) because of the capacitor characteristic used in the design. Do you have better idea for this purpose?
Thank you, I love all
I have a pulse repetetion frequency protection circuit (PRFPC)project. Actually I designed a five order active filter (by using two LM741) for this work. My purpose is to attenuate the input voltage of the PRFPC with the multiplied of 0.25 (If Vin=4V=> Vout=1V) at 4kHz, which is a low-pass filter.
Although the circuit performance is perfect for high duty cycle operations (>%10), it is not good for low duty cycles (<%1) because of the capacitor characteristic used in the design. Do you have better idea for this purpose?
Thank you, I love all





RE: PRF protection
RE: PRF protection
I will use the circuit as the protection circuit of power amplifer transmitter bias. Since the amplifier is allready pushed in order to get more power than the power it is able to give in CW, when the higher PRF come to the bias, the transistor blows up.
I don't have any idea about MCU, is it microchip unit or somthing?
Do you know any chip that can do this protection?
Thanks again
RE: PRF protection
TTFN
RE: PRF protection
RE: PRF protection
Your comments are very helpful. As I understood, I have to learn MCU programing.
I have no idea about programing mcu but I think I can cope with.
Have nice days
RE: PRF protection
RE: PRF protection
<nbucska@pcperipherals.com>
RE: PRF protection
I used a monostable multivibrator to protect the amplifier against duty cycle; there is no problem with duty cycle. Still struggeling to search a mcu which is appropriate for the design.
Actually I have another debate for you guys:
If you had two signals which are in different frequencies (Let's say one is 5MHz and the other 10MHz, both signal has the same amplitude 1V) flowing on two lines. And you wanted to combine these two signals in one line without damaging the sources of two signals. What method would you use.
I thought I could use a directional coupler to do that but the wavelength of the transmission line to design a directional coupler will be very long, so does the dimensions of the coupler. Even if I had a coupler to do that job, it would give very high loss because of the super possition analysis of combining two different frequencies by a coupler.
Another method I thought was to use two diods to do this job, but this time diods will have about 0.7V loss on them and more than half of the input voltage will be lost (1-0.7=0.3V we will have)
What else can do this job.
Thanks sharing your information. Have great days forever...
RE: PRF protection
TTFN
RE: PRF protection
RE: PRF protection