Skip to main content
Electrical Engineering

Return to Question

Bumped by Community user
Bumped by Community user
Bumped by Community user
Bumped by Community user
Bumped by Community user
Bumped by Community user
Bumped by Community user
Bumped by Community user
Bumped by Community user
Bumped by Community user
Bumped by Community user
Bumped by Community user
Bumped by Community user
Bumped by Community user
added 255 characters in body
Source Link
Meem Sarkar
Meem Sarkar
  • 73
  • 1
  • 7

Level shifter with emitter follower and voltage divider

As we can see that input fed to this amplifier is the output of final stage of a multistage amplifier and if we apply KVL to base emitter-emitter loop then KVL of Base emitter loopKVL of Base-emitter loop

NowVbb is the DC level acquired from the previous stage. Now, It is clear that the output of Q1 (emitter-follower) is less than (Vbb-Vbe1) here. But I dont understandI want to know What the importance and function of the Q2 constant current source are here. Further, it is also not clear to me that how the DC level of the previous stages goes upstage gets shifted upwards and how this output helpswhy we are trying to pull that down with the DChelp of this level downwardshifter circuit. Please

Please help me with the functioning of DC level shifters.

Level shifter with emitter follower and voltage divider

As we can see that input fed to this amplifier is the output of final stage of a multistage amplifier and if we apply KVL to base emitter loop then KVL of Base emitter loop

Now, It is clear that the output is less than (Vbb-Vbe1) here. But I dont understand how the DC level of previous stages goes up and how this output helps to pull the DC level downward. Please help me with the functioning of DC level shifters.

Level shifter with emitter follower and voltage divider

As we can see that input fed to this amplifier is the output of final stage of a multistage amplifier and if we apply KVL to base-emitter loop then KVL of Base-emitter loop

Vbb is the DC level acquired from the previous stage. Now, It is clear that the output of Q1 (emitter-follower) is less than (Vbb-Vbe1) here.I want to know What the importance and function of the Q2 constant current source are here. Further, it is also not clear to me that how the DC level of the previous stage gets shifted upwards and why we are trying to pull that down with the help of this level shifter circuit.

Please help me with the functioning of DC level shifters.

Source Link
Meem Sarkar
Meem Sarkar
  • 73
  • 1
  • 7

How does a level shifter shift the DC level of a multi-stage amplifier output to the ground (or zero)?

Level shifter with emitter follower and voltage divider

As we can see that input fed to this amplifier is the output of final stage of a multistage amplifier and if we apply KVL to base emitter loop then KVL of Base emitter loop

Now, It is clear that the output is less than (Vbb-Vbe1) here. But I dont understand how the DC level of previous stages goes up and how this output helps to pull the DC level downward. Please help me with the functioning of DC level shifters.