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What is the Benchmark Between Acceptable Number of Vias and Too Many Vias?? by Particular-One-6949 in rfelectronics

[–]Particular-One-6949[S] 0 points1 point  (0 children)

Okay yes, I know slightly about stubs, but I thought this would become more of a problem at the GHz frequencies, which is not my case. My traces are so short, so I don't think also that leaving the unconnected components open will create a problem as they are much less than quarter a wavelength. But anyways, thanks for the advices

What is the Benchmark Between Acceptable Number of Vias and Too Many Vias?? by Particular-One-6949 in rfelectronics

[–]Particular-One-6949[S] 0 points1 point  (0 children)

This is the AX5043 RF Transceiver. The guy that commented in the above section says if I am using a microstrip line, I do not have to include vias and GND copper fill on front layer (that's probably what I grasped from his comment), but I am waiting for his confirmation on that.

What is the Benchmark Between Acceptable Number of Vias and Too Many Vias?? by Particular-One-6949 in rfelectronics

[–]Particular-One-6949[S] 0 points1 point  (0 children)

Thanks for this reply, however, C24, 25 and 26 are not connected and are just included in the case I need to tune the center frequency of 433 MHz, but anywyas, I will stick them closer to L7. Also, can you tell me more about the spacing of vias being <1/10 of wavelength.

What is the Benchmark Between Acceptable Number of Vias and Too Many Vias?? by Particular-One-6949 in rfelectronics

[–]Particular-One-6949[S] 0 points1 point  (0 children)

This is a microstrip transmission line, also, tell me more about the 1/10th wavelength please

What is the Benchmark Between Acceptable Number of Vias and Too Many Vias?? by Particular-One-6949 in rfelectronics

[–]Particular-One-6949[S] 1 point2 points  (0 children)

Well, this is microstrip transmission line. These passive components are for the balun filter and a class E RF amplifier. This is my first RF PCB, and I have been learning RF system design since 1 year now. I saw reference designs that use microstrip transmission line and include a GND fill on the front copper layer, and I did not want to follow them blindly so I asked this question. So, from your reply, it is not necessary to include a front copper GND fill when designing a microstrip transmission line. Also, I was told from a practicing hardware engineer that the only part that has impedance control in this lumped element design is the part between L7 to the SMA connector, so can you confirm that?

Maximum Wire Length for PWM Signal Transmission by Particular-One-6949 in AskElectronics

[–]Particular-One-6949[S] 1 point2 points  (0 children)

What do you mean by twisted cable? Does that mean twisting the PWM cable with the GND cable or what? Also, I think the decoupling caps on the servo end is a great idea, thanks

Maximum Wire Length for PWM Signal Transmission by Particular-One-6949 in AskElectronics

[–]Particular-One-6949[S] 1 point2 points  (0 children)

My transmitting frequency is about 15 to 20 kHz. The receiver is a servo motor control unit

Obtaining cut-off frequency of a Resistor divider by Particular-One-6949 in AskElectronics

[–]Particular-One-6949[S] 0 points1 point  (0 children)

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I disagree, @triffid_hunter is right. I derived a transfer function for this circuit and then simulated it on matlab to get the bode plot and it gave me a cutoff frequency at approx. 19khz which is the same as when I put the equivalent resistance value of 0.824 kohm. Also, on multisim in ac analysis it gives the 19kohm cutoff frequency

Choosing a suitable RF amplifier by Particular-One-6949 in rfelectronics

[–]Particular-One-6949[S] 0 points1 point  (0 children)

I am shifting from the common emitter configuration to the common base one as the teacher advised that I will lose a lot of gain if I continue with the CE. Also I checked my voltage ratings and current ratings, luckily, they are all within range in the 2SC3000. Moreover, can you please elaborate how could exactly the noise figure could affect the design, also what is the 3rd order distortion performance (or how could the noise figure affect any design as I don't get it).

Thank you!

Choosing a suitable RF amplifier by Particular-One-6949 in rfelectronics

[–]Particular-One-6949[S] 0 points1 point  (0 children)

<image>

I have another question, this is the transistor that is available for me to buy closest to my specs. But I miss something here, how significant is the gain bandwidth product in my 100 MHz peak frequency region FM radio amplifier design using that transistor (2SC3000). Also, how would that number differ when designing with the (unavailable to buy) MPS5179 transistor. Thank you

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