Questions tagged [coupling]
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185 questions
3 votes
2 answers
148 views
Is it safe to route an audio signal trace underneath power rails (+15V/-15V) in a tight PCB layout?
I'm working on a compact PCB for a preamp circuit using NE5532 op-amps. Due to space constraints, I’m considering routing an audio signal trace on the bottom layer of the PCB, directly underneath the ...
- 325
1 vote
2 answers
115 views
What would be equivalent impedance of the following circuit?
Let's look at the following circuit, where L1 R1 is a long transmission line with some distributed parameters and R2 L2 is a long transmission line running back parallel to the first with M12 ...
- 133
7 votes
4 answers
873 views
Why does capacitive coupling require a base resistor in an emitter follower?
Images from Art of Electronics 1st edition, p. 58 (Horowitz and Hill) Both of these circuits accept an AC signal that is centered around 0V. The first (Figure 2.16) is supposedly coming from a ...
- 1,749
0 votes
1 answer
118 views
resistor placement in inverting amplifier to minimise noise coupling
(Image is my own creation.) I notice that an inverting amplifier can be very sensitive to capacitive and inductive noise coupling on a PCB. I was wondering whether the placement of the R1 resistor ...
0 votes
2 answers
120 views
What is the role for each of these AC coupling components?
I'd like to learn more about the RP2040 PWM Audio AC coupling circuit found in figure 22 in this document. Figure 22. Schematic section showing the Analogue PWM audio circuit Even though I understand ...
- 101
0 votes
0 answers
82 views
Transmision and coupling coefficient in waveguide and ring resonator
A simple ring resonator with a bus waveguide is described by: \begin{equation} \begin{pmatrix} B \\ C \end{pmatrix} = \begin{pmatrix} t & \kappa \\ -\kappa^* & t^* \end{pmatrix} \begin{pmatrix}...
- 155
5 votes
2 answers
450 views
RC coupling or LC coupling
I would like to generate a signal composed of an AC waveform and DC voltage separately, with the AC frequency range being 20 Hz to 20 kHz. I found there are two ways to achieve it: RC coupling and LC ...
- 151
3 votes
1 answer
106 views
Optimizing AC capacitor coupling for enhanced DC filtering
I need assistance in refining my AC capacitor coupling circuit to effectively filter the DC component of my input signal. The circuit consists of a current generator, a 1 Ω resistor, and an AC ...
