Monolithic RF Amplifiers ERA2 1mHz - 350MHz?

[SheldonQ]

Hello,
I search for Recommended Application Circuit for Monolithic Amplifi ERA-2+ DC - 4 GHz working from 1mHz to 350MHz.
Problem is in low freequency and DC coupled on output.
Datasheet
**broken link removed**

 

[betwixt]

LF is not a problem, they work down to DC. If the DC couple dinput causes you a problem, connect your signal through a capacitor. The IC has it's own internal boias circuit so you don't have to provide your own DC at the inpout pin.

Brian.

- - - Updated - - -

LF is not a problem, they work down to DC. If the DC couple dinput causes you a problem, connect your signal through a capacitor. The IC has it's own internal boias circuit so you don't have to provide your own DC at the inpout pin.

Brian.

 

[FvM]

You actually mean milli Hz? Then 0 - 350 MHz would be a clearer specification. MegaHz is no problem of course.

Although these amplifiers can be operated with DC coupling, they are not particularly designed for it. You have to accept a DC level shift and offset drifts according to the transistor Vbe temperature dependency.

I don't know your application requirements, so I can't suggest a specific solution. For a stable DC operation point, you'll either need temperature compensation, a seperate DC amplifier path or a kind of autozero circuit.

 

[SheldonQ]

And just looking for something like that. I need input amplifier to the universal counters, but to invent complicated than offset compensation and stabilization using two amplifiers. For Low frequency 0Hz - 100kHz use any operation amplifiier and for high frequency ERA. Well there will be switchable 100kHz filter