# Search results

1. ### Help needed with ModelSim Generics

Hi, I have a generic defined as a std_logic_vector(31 downto 0). It defaults to all bits being high ("H"). I have a question regarding passing the generics value in modelsim. Is it possile to set only particular bits of the generic? For example, say set only bits 12 downto 10, while the...
2. ### Need help with Monte Carlo Analysis

Hi, I am using Orcad Capture for simulating my design. I have an opamp based design. I need to find out how the offset voltage of the opamp varies when there is variation in the Vth of the other transistors. Basically, I need to use a distribution, say Gaussian, for the Vth variation of all...
3. ### How to calculate gain of this circuit?

Hi, I have the following opamp circuit (attached). I would like to calculate the expression for the gain Vout/Vin. An offset voltage is present in the opamp. The reference that I have sites the Vout as: Vout = Vin - Vos(1 + R2/R1) But I am unable to understand how to arrive at this result...
4. ### How to do Monte Carlo analysis when the DC analysis sweeps a model parameter?

Hi, I have to find the variation in the output of my design when the vth0 parameter of the mos devices varies. I inserted the required DEV and LOT values in the models and tried doing a MC analysis. The problem I encounter is that each run is a DC analysis of the circuit where one of the model...
5. ### Need help with Monte Carlo Analysis

Hi, I have to find the variation in the output of my design when the vth0 parameter of the mos devices varies. I inserted the required DEV and LOT values in the models and tried doing a MC analysis. The problem I encounter is that each run is a DC analysis of the circuit where one of the model...
6. ### Measure Leakage Current in MOS in a Lab

Hi, I have a really basic question. I have an NMOS transistor whose Id-Vgs curve I have obtained by biasing VDS=0.1 V and sweeping VGS from -0.5 v to 2 V. The threshold voltage is around 1.1 V (its a 5V technology). I need to obtain Ileak from this data. Usually Ileak is equal to Ids measured...