Hey Everyone.
I try to implement a non-inverting amplifier with single supply.
My signal is sine wave at 50KHz.
I try to simulate this circuit with ideal op-amp. I use the program Tina-TI and LT-SPICE
Tina-TI

and I get good resault:



LT-SPICE


The resault (green->Vin , Blue -> Vout)


After this I tried to simulate real Op-Amp IC, LMV654 and LMH6629, with TINA-TI but I didn't get good resault, you can see the voltage level of the output signal:




I try to change the frequency of the input signal, change the capacitors and resistors value but the resaults were not good. not like the Simulation with ideal op-amp.
Thank you very much

 

Try this arrangement.

 

Try this arrangement.
View attachment 310143

Hey. thank you about the answer.
But in this case There is not separation between my signal and the supply source and in this case my signal maje my supply voltage noisy

 

For a non inverting amp this is a normal configuration. Using a single supply requires a DC path to ground on the +input biased at 1/2 supply. R4 and R5 provide the bias.

 

Single supply opamp circuits are inherently different than circuits with bipolar power supplies. This is especially true if you want to AC couple your input signal into a single supply system. You might want to consult additional reference material on the difference between single supply and dual supply circuits.

For example:
Op Amps for Everyone Design Guide (Rev. B) (mit.edu)
Filter Design in Thirty Seconds (ti.com)

 

But in this case There is not separation between my signal and the supply source

Please explain what you mean by this. There must be a common GND between the signal and the amplifier circuit, or there is no return path for the input current.

Also, the non-inverting input must have a resistive path to GND at 0 Hz (DC) to establish the output stage DC operating point. In post #2, R4 and R5 establish this.

ak

 

Hey. thank you about the answer.
But in this case There is not separation between my signal and the supply source and in this case my signal maje my supply voltage noisy

There must be a DC path to ground on both inputs of an op-amp, otherwise it won't work.
A split supply with V+ and V- will have better supply noise rejection than a single supply biassed to half V+ with resistors.
If you really must avoid any connection to the supply, then you need a signal transformer on the input.

 

There must be a DC path to ground on both inputs of an op-amp, otherwise it won't work.
A split supply with V+ and V- will have better supply noise rejection than a single supply biassed to half V+ with resistors.
If you really must avoid any connection to the supply, then you need a signal transformer on the input.

I didn't understand how to use the transformer

 

I didn't understand how to use the transformer

Connect your signal to the primary. Connect the secondary between ground and the op-amp's non-inverting input.

 

Who mentioned current amplifier, with or without the spurious link?