sys_eng
Full Member level 4
1)why is 50ohm impedance? why not 10, 20, 60, 80? what so special about this number?
2)input to the gate of the transistor which very high input impedance, would that overload the signal source at the gate?
3)why open drain configuration is popular? if you connect a load to it then it's unmatched in terms of impedance.
I mean, the load is 50 ohm, but the output impedance of the open drain is Not 50 ohm, so they are unmatched.
4)I read somewhere if its oscillator circuit, the Q factor is improved by having output impedance increased. Is having higher Q factor means having higher resonance frequency therefore higher bandwidth?
5) do you want to operating at resonance frequency? I mean imaginary impedance gone and only the real one exist, so it's most efficient. So you want operating at the most efficient point.
2)input to the gate of the transistor which very high input impedance, would that overload the signal source at the gate?
3)why open drain configuration is popular? if you connect a load to it then it's unmatched in terms of impedance.
I mean, the load is 50 ohm, but the output impedance of the open drain is Not 50 ohm, so they are unmatched.
4)I read somewhere if its oscillator circuit, the Q factor is improved by having output impedance increased. Is having higher Q factor means having higher resonance frequency therefore higher bandwidth?
5) do you want to operating at resonance frequency? I mean imaginary impedance gone and only the real one exist, so it's most efficient. So you want operating at the most efficient point.