The rice that unscrambles dynatron amplifier straps effect
[introduction] the technology that the article will come to take the rice about dynatron amplifier to strap effect explains. Dynatron shoots class amplifier in all is the most commonly used amplifier circuit, shoot class to magnify circuit is as follows in all.
One: Dynatron shoots class enlarge circuit in all
Dynatron shoots class amplifier in all is the most commonly used amplifier circuit, shoot class to magnify circuit is as follows in all:

By lecture of series of imitate circuit design the high frequency and equivalent model of 12 knowable dynatron is as follows:

According to circuit the principle can get voltage node equation:

Among them:

Can reach by above:

1) the first GmRL is volts d.c. gain
2) the 2nd is the voltage attenuation that brings by RΠ , Rx and Rs (cent is pressed)
3) this is passed contain right half plane at 0 o’clock, frequency dot is located in Gm / Cμ , frequency of this frequency place is very tall, be more than the WT of dynatron far, because we are negligible in this analysis process this is high frequency at 0 o’clock
4) pass from this contain knowable should pass contain two the limit
2: Shoot model of equivalent of only the limit of class enlarge circuit in all
Oversight is right half plane is high frequency at 0 o’clock, restrict by the bandwidth of dynatron additionally, can get dynatron shoots class to magnify model of equivalent of circuit only the limit is as follows in all:

Among them Cμ was magnified 1 + (' of Gm + Gs) RL times, that is to say the feedback capacitance between input and output was magnified 1 + (' of Gm + Gs) RL times, this is Miller effect.

3: What rice straps effect is farther discuss
If pursue (A) , capacitance Cf crosses a bound to turn over enlarge circuit at losing feedback two end, amplifier gain (enlarge multiple) for – A.

By the graph (B) , we can beg the input impedance that gives this amplifier:

The 1 + A that because the negative feedback effect of this amplifier makes,the input capacitance of amplifier is feedback capacitance times, a is the gain of amplifier, this is famous Miller effect.