Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
mimcaps
In a low pass filter where the product of capacitance and resistamce determines the total time constant associated with the circuit. So a variation will effect the rise and fall time. Hence it is better to use MIMcap than MOScap
op amp for biasing
Closed loop stability is a vital parameter for this opamp. The opamp has to be stable at least in the operating frequency range(At least 10 times the operating frequency range) .
In a analog design biasing is required to keep the transistors in design in strong saturation. Biasing also helps the circuit to operate around a operating point. A small signal input has to be applied around this point only. When a dc bias is applied to the input transistor , it forces the...
op amp for biasing
The op-amp is used in the bandgap reference circuit. If this is the case than u have take special care of input offset voltage . For a 350nm technology (1.2v) , the typical output offset should be less than 20mv. All these things will work provided DC bias to the circuit is...
Let us start from current source . In order to understand this we need two equations. First one is the saturation current equation(square law) and threshold equation considering Vsb & Vtho. Now substitute Vth equation in Idsat and simlify. considering a fractional change in Id current apply...
Sensors (MEMS) can not be compared with other standard blocks because sensor can not give output directly as given by analog or digital circuit. Consider the caes of of accelerometer, It can be ,odelled as a variable capacitor. Its capacitance is a function of the external force applied(assuming...
vth vs. length
threshold does not depend on the length . This is a quite general statement given in literature but if we keep on reducing the length than it will change . This change can be observed for both length and width.
please see the ieee site
For a accurate simulation result it is better to use the models provided by the founadary . For BJT it is very important to select the proper models , otherwise it will result in lot of mismatch in current values
Switch Capacitor
Hi
the common - mode voltages at the input has to be generated by a proper voltage reference circuits . These circuits are typicaly a special class of mirror ( temperature independent ). Once the circuit is designed ,it can provide the bias voltage to the gate of input...
Dear Friend
All simulators are based on one principal only. They convert all devices into their equivalent circuit. So we can say that the total circuit is converted into the spice code from their equivalence parameters. The simulators like Tanner, Cadence & Mentor Graphics all work...
gain boost differential
As the design is DIDO ( may be rail - rail ) , hence check the consistency of the transconductance in the total input range . If the input stage is designed using level shifter than the checking is easy ( Just sweep the bias point ) . Consider the case of a TL based...
Switching scheme of mosfet is dependents on the application where it is used. So consider two example such as sampling purpose and circuit emulation. consider the first case of sampling purpose, here we are controlling the threshold voltage by giving suitable amount of bias to the circuit. This...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
