Dimension a Cascade connected circuit

[Ventilo]

Hello, before I ask you my question I just wanted to say I am new at the board.

So over to my question. I need some help to dimension a cascade circuit amplifier with the LM324. The circuit must fulfil the following values:

- In Impedance = 25kΩ
- Above frequency = 100Hz
- Below frequency = 150kHz
- Maximun gain = 40dB

I have solved the first circuit by having a LP-filter at the input and 2 amplifiers cascade connected to each other. So the gain = 20db/amplifier = 20db*2=40dB in my case.

Now I need some help with the HP-filter. Can someone give me som suggestion on a cascade connected circuit with the following parameters that I have give you at the top. I will not work for me...

 

[yxo]

Why you need LM324? Old awful amplifier! You need 3 stage. Because this amp has low GBWP, only 1 Mhz! In 20 dB configuration bandwidth of you amplifier will be only 1000000/10 = 100k. You need input impedance at given frequences or dc only?. For determinated input impedance neccesuary know configuration of schem (inverting, non-inverting, differential?)

 

[Ventilo]

Why you need LM324? Old awful amplifier! You need 3 stage. Because this amp has low GBWP, only 1 Mhz! In 20 dB configuration bandwidth of you amplifier will be only 1000000/10 = 100k. You need input impedance at given frequences or dc only?. For determinated input impedance neccesuary know configuration of schem (inverting, non-inverting, differential?)

You got PM!

/Kango