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Hi:
I am trying to perform noise analysis on a cmos amplifier circuit with Hspice. I want to measure the contribution from each transistor by using some commands in Hspice, but I can not find an example. The only way I can get this figure is to use Awaves, in which a variable "nt(mn)"...
Hello Everyone:
I am trying to use a memory cell called switched current memory cell, which is using a switched current technology. It is a cascode cell shown in my attachment. The function of this circuit is as follows:
1. When Φ1 is active and Φ2 is de-active, a total current of J + Iin...
Hi All:
If any one can help me to understant the time constant derived in Razavi's book on page 437. The final transfer function looks like:
Vout/Vin = -[Ceq*α*(Gm-C2*S)*Ro]/[Ro*(CL*Ceq + CL*C2 + Ceq*C2)*S + GmRoC2]
the author...
Hi All:
Except for using phase margin to juge the circuit stable or instable, can I use other simulation methods to obeserve the ossilation at the output . I am thinking I can use a step response simulation. because I think the instable system will give rise to a non-damping output signal...
Hi All:
I may ask a stupid quesion, but it bothered me for long time. Now I have a system with phase shift of 185°, as a result this system will becomes unstable. I could do some compensation for this system, but it will increase the power. Because power in my design is very strict. I used...
class ab site:edaboard.com
Hi All:
I am listening to the Berkeley lecture of EECS140 about the stability. There is a circuit about Class AB Input Stage Cross Coupled Differential Pair, which is attached. I don't quite understand how this circuit works. Because on the schematic, node A and...
Re: about zero
I think is's better to use the following way to understand the pole and zero. Considering a transfer function with one zero and pole:
H(s) = Ao(1+s/ωz)/(1+s/ωp), we say this transfer function has a zero at the left half plane, because when the nominator equals to 0, we can get...
Re: about zero
Hi:
If the feedback can creat a zero on the left half plane in the s domain, it can be used to cancel some poles, therefore to reduce the overall phase margin to increase the stability of the circuit.
J
If the feedback is a pure capacitive network, and we use OPAMP as the amplifier, we can get two types of feedback, one is shown in figure 1(series-shunt), another is figure 2(shunt-shunt). In the series-shunt version,
the B(s)= Vfb/Vout=C1/(C1+C2), it is a constant. But in the shunt-shunt...
I don't quite agree with you, when you derive the GBP for the amplifier with a pure resistor feedback network, you missed something. For the system with the feedback network, the transfer function should be:
H(s) = A(s)/[1+A(s)B(s)], if we assme the amplifier is a single pole system, and
A(s) =...
Thanks for everybody to reply me
Btrend, once I connect a high resistance from X to GND, can I do the simulation like the following setup: 1. apply a sinusoidal signal to the positive input node; 2.apply a specific bias voltage to the Vin node (like the way I did in my open loop simulation)
J
Thanks Btrend, your explaination makes more sense. I have another question for you with the characteristics analysis on the closed loop amplifier. In the figure 1 in my attachment, it is a general testing setup for an open loop amplifier in frequency response analysis. If I want to test a...
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