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output impedance polyphase filter
The Gilbert mixer has resistor load.(400ohm)
Does the polyphase filter affect the linearity of the mixer?
does the polyphase filter requires a low output impedance buffer?
When we simulate mixer,usually the LO signal is sine wave, but actually the LO signal may be square wave,so how to evaluate the effect of higher order harmonic of LO signal?
output noise ldo
What is the main contribution of LDO's large external output capacitor? Better transient response or low output noise? Or other reason?
What about some on-chip LDO with small (<100pF) onchip output capacitor,do they have sever problems?
The current gain β=Ic/Ib is almost constant for moderate bias current,but if bias current is too high or too low,the β decreases,can anyone explain it ?expecially in terms of semiconductor device,thanks.
transient responese of ldo
Thanks to all of you,some suggestions really inspired me,and I finally confirmed that the main reason for large overshoot and undershoot is due to small capacitor, not phase margin or some other things.
So,if I want to design an LDO for RF applications,off-chip large...
why threshold decrease as temperature rise?
and I have found that above room temperature,electron mobility decrease as temperature increase because the scattering effect increases
C1 has been connected to a voltage source V1 for a long time,at time 0,the switches switch the connection from V1 to C2,i.e. V1 is cutoff,and the two capacitor are parallel connected,what is the voltage waveform on C2?
(all the capacitors and voltage source has one node connected to groud)
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