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Why does a female-female coupler break the USB-C standard?

A single USB-C cable will not pass all wires through it, so you can't make an USB-C extension cable. As there are two CC pins. The cable, or rather, both connectors terminate separately one of the CC ...
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18 votes

Why does a female-female coupler break the USB-C standard?

USB-C extension cables may violate the standard, as it breaks some required functionality as mentioned by @Justme. But that does not seem to have stopped a variety of manufacturers from building and ...
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11 votes

What's the purpose of the band-pass filter in an RF transmitter?

Every mixer produces quite a deal of unwanted frequencies. These include: frequencies contained in both input signals the above frequencies multiplied by various integer numbers all of the above ...
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11 votes
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What's the purpose of the band-pass filter in an RF transmitter?

The output of an AM (Amplitude Modulating) mixer contains a number of frequency components. These components are 1) the modulating signal. This signal is typically audio frequency, and in the diagram ...
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8 votes

How to choose the RC values between a buffer and an ADC input?

It is not for anti-alias filtering. When the ADC performs a conversion, it charges a capacitor to the input voltage and charging the capacitor takes a surge of current. So at 250 ksps, the ADC input ...
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7 votes
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How to choose the RC values between a buffer and an ADC input?

It is clear in the question that it is already known that the RC has nothing to do with anti-aliasing for the sampling frequency mentioned. From the ADC datasheet we can get an equivalent input ...
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5 votes

What's the purpose of the band-pass filter in an RF transmitter?

Before sending the signal to the antena the signal's bandwidth must be limited using a band pass filter in order to avoid interference with adjacent stations. Most of the RF spectrum is regulated by ...
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4 votes

Does VGA (video graphics array) carry an analog-modulated digital video signal?

The actual video pins on a VGA connector are red, green, blue, horizontal sync, and vertical sync (there are some digital monitor ID pins, but they don't matter here). Sync is pulses (per line and per ...
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4 votes

What's the purpose of the band-pass filter in an RF transmitter?

This is the basic configuration of a radio transmitter which actually generates the modulation digitally in the computer. The output of the DAC can have for ex. data which is amplitude-phase modulated ...
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3 votes

Difference between application of series and parallel (grounded) capacitor

As you correctly surmise, C1 and C2 are there to block DC on the input and output sides respectively. L2 and L3 form the "top halves" of voltage dividers, where the "bottom halves" ...
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3 votes

Difference between application of series and parallel (grounded) capacitor

So what you ask must be thought with the context that it is an RF device, such as RF amplifier. Yes, the capacitor in series is used to block DC and pass RF only. This lets the chip input to bias ...
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3 votes

Does VGA (video graphics array) carry an analog-modulated digital video signal?

VGA signals are analog RGB. They can be digitized in the monitor and processed digitally, then presented to the display, or used directly on a CRT. What monitors digitize the signal? Later-generation ...
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2 votes
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Relation between signal mixer and filters

A diode ring mixer used in your previous question can generate amplitude modulation suitable for radio-frequency transmission. The example shown uses a sine wave V_carrier, frequency of 50 MHz. This ...
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2 votes

How to choose the RC values between a buffer and an ADC input?

This is not really a filter but a matching network between the output of the op-amp and the switched capacitor input of the ADC. Its purpose is twofold: to shield the op-amp from the disturbances of ...
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2 votes
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How to achieve signal gating with trigger input

You can achieve the pulse-gating in your requirement, using a negative level-sensitive latch and an AND gate. Modified version of typical Clock Gating cells found in ASIC libraries. If you describe ...
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1 vote

Why does a female-female coupler break the USB-C standard?

Also, USB-A/USB-C cables are legal. If you connect two of those to your device, you end up with an A-A cable, which is definitely illegal.
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1 vote

Puzzling mains-frequency interference at output of signal generator

Assuming you've already eliminated the possibility of measurement error (i.e. scope ground loop, etc), here's a hypothesis: a short between the power transformer secondary winding and the core or case....
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1 vote

Does VGA (video graphics array) carry an analog-modulated digital video signal?

If VGA (video graphics array) is analog, then how is it compatible with a digital monitor? It's not "compatible" by any meaning of the word. (I'd even say: a signal is never compatible ...
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