| Author |
Message |
Mac7978
Joined: 17 Oct 2003
Posts: 44
|
 17 Oct 2003 9:42 How to design an Integrator except using Op-Amp!!! |
|
|
|
Dear all,
It's possible to construct an integrator using differential amplifier structure??? The operating frequency of this integrator is up to 1-2GHz.
Thank You.
|
|
| Back to top |
|
 |
tapa
Joined: 17 Feb 2002
Posts: 280
Helped: 2
Location: spain
|
| 17 Oct 2003 10:03 Re: How to design an Integrator except using Op-Amp!!! |
|
|
|
| Realy I can't see what you mean. But the easier integrador is a Low-Pass Filter. Or a corrected centered band pass. Or do you need to integrate the power of the RF signal?
|
|
| Back to top |
|
|
flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
|
| 17 Oct 2003 15:43 differential integrator |
|
|
|
| Try the same circuit topology as is used with resistors to get from differential to single ended gain. Start with the usual resistor to the inverting node and a capacitor from the inverting node to the output. Instead of grounding the noninverting node, run a resistor from it to the other circuit input and a capacitor from it to ground. Have both capacitors in the circuit the same value.
|
|
| Back to top |
|
|
mrcube_ns
Joined: 10 Apr 2002
Posts: 416
Helped: 10
Location: Dark side of the Moon
|
| 17 Oct 2003 21:39 Re: How to design an Integrator except using Op-Amp!!! |
|
|
|
Op_amps can work at few MHz maximum.
1-2GHz No chanse.
Idea with Low pass filter is good.
You must be careful with parasit capacity on those frequencies.
Mr.Cube
|
|
| Back to top |
|
|
flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
|
| 17 Oct 2003 22:16 op amps |
|
|
|
| There are several companies that make 1 GHz+ op amps. I heard of one at 5 GHz but I cannot find the company that makes them.
|
|
| Back to top |
|
|
BigBoss
Joined: 17 Nov 2001
Posts: 927
Helped: 47
|
| 18 Oct 2003 1:49 Re: How to design an Integrator except using Op-Amp!!! |
|
|
|
GBW of the OPAMPS are limited to 1GHz.But you can realize an opamp with discrete components. For instance a emitter follower with a current source and 2 transistor output stage with a current source that is biased with the same current source of follower.
It's not very difficult. If you use wideband transistors of Philips , ( or other brand ) it will be very nice Opamp up to 2-3 GHz. It's good to try..
The only point that should be pointed out that is stability. Others are classic.
If you can build it up with discretes , you can also use it as an integrator.
|
|
| Back to top |
|
|
Mac7978
Joined: 17 Oct 2003
Posts: 44
|
| 22 Oct 2003 4:09 Re: How to design an Integrator except using Op-Amp!!! |
|
|
|
Is it all kinds of low pass filter can work as an integrator?
Best rgd.
|
|
| Back to top |
|
|
