I want to know what do diodes facing opposite each other do?

[daniel08]

Dear Experts.

I like to confirm that operation principle of the attached circuit.

1. what do diodes facing opposite each other do?
2. how to calculate v2 voltage?

Please could you comment on this?
Thanks very much.

 

[davenn]

hi daniel
welcome
interesting, haven't seen one using double sets of diodes before
if you ignored the V1 output and the 2 diodes above it then it would be basically a voltage clipping cct ( 1 or 2 diodes down to GND from the logic line and another couple up to VCC)
Bringing the 2 diodes down from VCC to V1 is producing a voltage reference point that will be the sum of the voltage drop across those 2 diodes -- approx 0.7V each

am also looking forward to some other explanations :)

Dave

 

[es1]

This feels a lot like homework due to the missing information.

Some information we would need to know to answer the question: What's VCC? What's the logic signal? Is the logic level a current signal or a voltage signal? Is the logic signal clamped to VCC or GND by something other than the given diodes?

 

[carlgrace]

Dear Experts.

I like to confirm that operation principle of the attached circuit.

1. what do diodes facing opposite each other do?
2. how to calculate v2 voltage?

Please could you comment on this?
Thanks very much.

The circuit is a level shifter. v2 is a copy of v1 but the high and low voltage of the logic signal is shifted up two voltage drops. VCC has to be high enough for this to work because the diodes connected between v2 and VCC need to be reverse-biased.

 

[alphysicist]

Dear curious individual,

Thank you for your interest in understanding the operation of diodes. Diodes facing opposite each other, also known as anti-parallel diodes, are commonly used in circuits to protect against reverse voltage and current. When connected in this manner, the diodes allow current to flow in one direction while blocking it in the opposite direction. This is useful for preventing damage to sensitive components in a circuit.

To calculate the voltage across v2, you will need to know the voltage drop across each diode and the current flowing through them. You can use Ohm's Law (V=IR) to calculate the voltage drop, and then add the two values together to get the total voltage across v2.

I am unable to comment on the specific circuit without further information, but I recommend consulting a textbook or online resources for a more detailed explanation of diode operation and circuit analysis.

Best of luck in your studies!

Sincerely,