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the swing between the terminal of Cgd is reduced. because the gain between the gate and the drain is becomed smaller than there is no cascode transistor.
the main function of cross pmos is to generate hysterisis. due to the diode pmos clamp the output swing, the cross pmos is also to increase the gain to enhance the speed. in the meanwhile, the cross pmos adds another current to bias the differential pais input nmos in order to increase the Gm...
comparator simulator
In the ADC design, the accuracy is the key parameter.
the accuracy includes staic erro and dynamic erro,
Staic erro ----> noise + gain + offset
Dynamic erro ----> speed ( which is relative bandwith )
So, the noise, gian, offset, speed are the parameters which shold be...
About the bias a bipolar transistor, there are some criterias.
1) If you want to get better current gain ( beta), you can sweep the Ic-Ib to get the proper bias of bias current,
2)If you want to get better matching of bipolar, the density of colletctor current is important, it is mean, the...
harrytrinh is right!
If you want to get a constant current, I think there are so many ways. all can be divide two kinds, first , you get a constant voltage which is independent power supply, then use the constant voltage goes throght a resistance with feedback.
another, you can get two kinds...
gm constant current source
In fact, there are so many circuits paper about the constant gm in the IEEE SSC.
In the Thmos.Lee book, there is a practical circuit for constant gm bias.
using the swithed-capacitor technique.
only need one capacitor and four swithes and four phase clock.
if you want to amplify the difference, you need to use integerator to flow the sample as a ration amplificaton with capacitor ratio.
first, you can not change the polarity because the stability.
the positive loop, minus input of op->output of op->pmos gate->pmos drain (left)
the negative loop plus input of op->output of op->pmos gate->pmos drain(right)
generally,when the op-amp is used as comparator, it works as pre-amplifier in order to speed up the speed. but, if we do not need so high speed. we can use the amplifer as comparator without the compensation.
But, the latch is used as comparator when it is only in the discontinue system. in...
Re: the driver ability
using the equal ratio inverter chain can decrease the delay, so it can make mosfet turn on fully fast in order to save the power dissipation.
this is a basic skill to drive large loading.
If the driver is analog signal, you may be not use the inveter, thus, the analog...
+hspice more than 50 parameters data statement
Maybe there are some ways to deal with it.
First, you have to define the parameters vtest5* (* is 1~75) with .param command in the global variants.
The second, the commands are different as below:
.data p MER file='0_0.fn' vtest1=1 vtest2=2...
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