jm567‭

I am designing a 4-layer PCB that has both analog and digital circuitry throughout it. The analog section involves high return currents as well as ADCs sampling the voltage across sense resistors a...

1 answer  ·  posted 4y ago by jm567‭  ·  edited 1y ago by Lorenzo Donati‭

I was watching this video by w2aew on the function of ceramic bypass capacitors, and at 6:00 he states that high-frequency currents take the path of least-impedance and make their way to the power ...

1 answer  ·  posted 4y ago by jm567‭  ·  edited 1y ago by Lorenzo Donati‭

I see a lot of common collector amplifiers with the output taken across an emitter resistor. What is the purpose of doing it this way instead of connecting your load directly to the emitter? I sh...

4 answers  ·  posted 4y ago by jm567‭  ·  edited 1y ago by Lorenzo Donati‭

On paper you can measure the input impedance of an amplifier circuit by attaching a voltage source to the input, shorting the output, and calculating the resulting impedance from the voltage and cu...

1 answer  ·  posted 3y ago by jm567‭  ·  last activity 3y ago by coquelicot‭

In a lot of textbooks, filters seem to be designed around a matching source and load impedance. However, If I have a filter stage between an antenna and an LNA, wouldn't I want the load impedance(i...

2 answers  ·  posted 4y ago by jm567‭  ·  last activity 4y ago by Olin Lathrop‭

How exactly is the emitter capacitor C3 helping to increase the voltage gain in the common emitter amplifier below? Is it because for AC signals the emitter looks like a short to ground and that es...

2 answers  ·  posted 4y ago by jm567‭  ·  last activity 4y ago by Circuit fantasist‭

I am having a difficult time picturing the flow of current and the role of the capacitor during the OFF time of a buck converter. Here is my understanding so far. During the ON time the magnetic fi...

1 answer  ·  posted 4y ago by jm567‭  ·  edited 1y ago by Lorenzo Donati‭

Hello, I am designing 1/4 WL strip antenna for a bluetooth chip and i had some questions regarding the 50 Ohm feed line. Right now I am using a Nordic-recommended 1.5mm trace width and a 23mm + 4mm...

1 answer  ·  posted 4y ago by jm567‭  ·  last activity 4y ago by Olin Lathrop‭

I want to make a simple 7MHz direct conversion SSB receiver in order to materialize some RF concepts I have been teaching myself lately. My question revolves around the mixer portion. I'm failing t...

1 answer  ·  posted 4y ago by jm567‭  ·  edited 4y ago by jm567‭

I've been experimenting with LC filter circuits on the output of a SMPS I recently bought because it was too high for the circuit I'm making. After hooking up many different combinations, I found t...

0 answers  ·  posted 4y ago by jm567‭  ·  closed 4y ago by Olin Lathrop‭

I'm curious about FPGAs and would eventually like to get into them sometime during the future, so I'd like to ask three broad questions to help orient myself: In what applications are FPGAs the m...

0 answers  ·  posted 4y ago by jm567‭  ·  closed 4y ago by Olin Lathrop‭