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I followed this lecture with a mix of this schematic resource. I also attached my computations based on these resources. I'm really sorry, our instructor did not really teach us anything about this design- and computation-wise, so we are going in blind with this. It would be much appreciated any...
Hello,
Thanks for the reply. May I ask what does drain power supply missing mean? Sorry, I am new and this is all of the components I see in resources so I do not know what drain power supply to add. How can I fix this LNA circuit? It's supposed to be within the BW 0.65MHz - 1.45 MHz with input...
Hello,
I have been unsuccessfully searching on how to plot the third order intercept point or IP3 in LTSpice. I know that its the output power vs the input power both on log scale. However, I can't find my way in LTSPice, as I am still a newbie. My schematic is attached.
Any help would be much...
It just needs to be a low noise amplifier.
This is exactly my situation right now. So unfortunately I cannot use the OpAmp suggestion, but thank you very much for that nonetheless.
And we weren't given much resources, just the specs. And when I google 'LNA design methodology' or any other...
Hello, thanks for the comment. Besides the 0.65 - 1.45 MHz BW, I will need a NF less than 3 dB, a power gain of approx. 10 dB, an IIP3 greater than -5 dBm, and an input and output impedance of 50 ohms. I apologize for not putting it in the first post. Supply range and max. consumption wouldn't...
Hi, thanks for the reply! I am a student, and unfortunately my project specifically specified that an LNA stage is required. So sadly, I still need a LNA even though it is not the best option for the frequency range. Would you perhaps have an LNA topology to suggest that will have a response and...
Hello,
I was searching through CMOS LNA designs and I found this in GitHub and I think it's perfect for my application except for the frequency. For this, I will need a frequency range of 0.65MHz to 1.45 MHz instead of the 2.4 GHz in the original design.
Can you guys point out the inductors...
Hello!
Channel Equalizer solve the problem of ISI so it improves the received signal. But if I use it in a communication system, doesn't it affect the bit rate? And it adds processing and receiving delays. Is there a way so that adding a channel equalizer doesn't affect the bit rate and add...
Putting in the resistor did help, thanks for that. Unfortunately, biasing the amplifier requires polar modulation, something too advanced for a newbie like me. I'll try to explore other topologies. Thanks for the feedback!
Yep, I get it now. I think the Class E is really not the right one for...
Hello!
I am designing a Class E amplifier. Its input signal is a BPSK signal below of around 4vpp and I need it to be amplified at least 15.4 dBm.
Furthermore, it needs to be able to drive a 50 ohm load. I used the Class E component calculator to solve so that R = 50 because that's my given...
oh, I think I did an arithmetic mistake, thanks for pointing it out. I think I got the 51 dBm because I was confused about the operations involving dBm and dB. 15.4dBm does sound more reasonable. We're not allowed to use generators, so I will probably do a Class D amplifier. But you're right...
I set a link margin of 5dB, so the minimum signal power that the receiver should detect would be -45 dBm. I computed the path loss to be 60.4 dB if 50km is used with 500kHz operating frequency. so the transmit power is -45 dBm + 60.4 dB = 51 dBm.
But of course, I am really not sure about my...
Thank you for the discussion! I kind of got it, and from my research from the clues you gave me, I think I got was that I need a transmit power of 51 dBm. It does seem kind of a lot, though. Do you guys have any suggestions what topology of transistor power amplifier should I use to achieve this...
Hi! Fortunately, or unfortunately depending on one's view, this project will only be simulated because of the remote learning due to the pandemic. So I need not to worry about permissions because we won't really broadcast in real life. I only need to operate this project on a purely theoretical...
Hello!
I have a 4vpp signal at 500 kHz that needs to be transmitted at a max distance of 50km. Therefore, it needs to go through a transistor power amplifier that will also drive a 50ohm load (theoretically, the antenna). The bit rate will be 50 kbps. The receiver sensitivity at the end of the...
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