Help needed to analyse given circuit - equation of gain

[ranggaperdana_06114]

Can You Help Me?

Hi bro can you helpme to analyst this circuit?
tanx

 

[kwkam]

Can You Help Me?

it is a differential to single end amplifier

 

[ranggaperdana_06114]

Can You Help Me?

can you tell what is the equation of gain in that circuit?

 

[hock]

Re: Can You Help Me?

the gain of the first stage is 9K/(2K/2) = 9
the gain of second stage is 10
gain of last stage is R39/R36 = 10 when j6 is closed
gain of last stage is 1 when j6 is open

hock

 

[ranggaperdana_06114]

Can You Help Me?

can you explained more details?
please

 

[hock]

Re: Can You Help Me?

search for 3 op-amp instrumentation amplifier.

hock

 

[ranggaperdana_06114]

Re: Can You Help Me?

see my circuit again...

 

[LvW]

Re: Can You Help Me?

Hi bro can you helpme to analyst this circuit?
tanx

Two comments:

1.) I suppose, R3 should be also 9 k;

2.) The polarity of the inputs of opamp 3 has to be interchanged.

After correction it is a classical instrumentation amplifier with a gain 9*10=90.

 

[ranggaperdana_06114]

Can You Help Me?

can you tell what is th equations of it

 

[hock]

Re: Can You Help Me?

now i know you are too leasy.

ok it is like this.
due to virtual ground concept input + and input - will appear across R2. now you can prove that the center point of R2 will be at ground potential(can you do that). replace R2 with 2 1k resistors with the common point grounded. so now the gain of u1 and u2 is 1_9k/1k = 10. U3 has a gain of 10.

total gain is 100.

enjoy your class submission.

hock

 

[ranggaperdana_06114]

Re: Can You Help Me?

tanx bro. now i want to know what is the gain formula of this circuit BELOW?

 

[BrianSu]

Can You Help Me?

if the input of U1 is assigned as V1 and another input of U2 is V2, the final output would become (V2-V1)X[1+(R1+R3)/R2]X(R6/R4) which is under R6=R7 & R4=R5.
So that, for ur question the first gain is (V2-V1)X[1+(R1+R3)/R2] .

 

[ranggaperdana_06114]

Can You Help Me?

tanx so much

 

[ranggaperdana_06114]

Re: Can You Help Me?

i'v more question i try to analyst this circuit is high pass filter but i dont get the gain can you tell me the formula of it

 

[hock]

Re: Can You Help Me?

please read the book Operational Amplifiers by Tobey.

we are not here to solve your college tutorials.
you have been given enough hints. now if you want help first show what you have done to solve the issue.


hock

 

[kesmez]

Can You Help Me?

c1 and r1 should contact r2 and r3