currently I'm studying MMIC amps like this one:
From what I can understand, these MMIC claims to be wideband, and I guess that the operating frequency is given by the components around the MMIC.
Let's take a look to the recommended application circuit for the MAR-8 (datasheet):
First of all, the first important component is the bias resistor: is determined by the given supply voltage for the circuit (eg if Vcc is equal to 7 volt, the bias resistor must have a value of 88.7 ohm; if the Vcc is equal to 12 volt, otherwise, the bias resistor must a have a value of 226 ohm). Another thing that is not clear to me are the values of the two capacitors "Cblock" and the value/presence of the inductor, since, on the above datasheet, the inductor is also stated as optional; I guess that the values of Cblock capacitors and of the inductor will determine the working frequency, am I right?
Well, let's take as example this wideband amp kit: RF wideband amplifier which claims to be able to operate from 0.1 Mhz to 2000 Mhz, and the supply voltage can go from 6 to 12 volt. Is not very clear to me: this kit seems provided with fixed values components: so: how is possible that we can apply a supply voltage from 6 to 12 volt, if there is a bias resistor with a fixed (and unknown) value? And is the same for the inductor and Cblock capacitors: if the inductor and these capacitors will determine a specific frequency, how, this kit (which is provided with fixed value components), would be able to achieve a very wide range of frequencies? Or is just a waste of money, since, maybe, wouldn't be able to work as claimed?
Ok: can someone explain me how to choose Cblock capacitors and the inductor (and why the inductor is stated as optional) to have a MMIC able to effectively work in a wide range of frequencies? And maybe can someone explain/show me a practical example with a schematic, eg, to achieve a MMIC circuit which is able to work from 800 to 1000 Mhz?
Please consider that I am a "newbie" about these subject, so I would appreciate a clear and exhaustive answer.