SPICE Simulation Correction Circuit for P-Well Resistor Body Effect
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Solution Overview
Problem
Existing simulation systems, such as SPICE, cannot accurately simulate the behavior of p-well resistors with the body effect, as they do not account for the depletion of the n-buried layer and p-well, leading to inaccurate resistance calculations and current-voltage characteristics.
Innovation Solution
A simulation method and device that includes a correction circuit in the SPICE simulation system, comprising a first and second resistor, parasitic diodes, and correction coefficients to simulate the body effect, allowing for a more accurate representation of the p-well resistor's behavior by incorporating a series and parallel circuit configuration and voltage supplies to account for body voltage variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard SPICE resistor models are used, then simulation simplicity is maintained, but body effect in p-well resistors cannot be simulated
Solution Approach 1:
The p-well resistor is segmented into multiple functional components: intrinsic resistor blocks, parasitic diodes, and correction circuits. Each component is modeled separately and then integrated to form the complete three-terminal resistor model that accurately captures body effect behavior.
Solution Approach 2:
Parasitic diodes are introduced as intermediary elements between the p-well resistor terminals and the substrate. These diodes mediate the body effect by modeling the depletion region formation and charge redistribution that occurs when body voltage changes, enabling accurate simulation of resistance variations.
2Measurement precision
If parasitic diodes and correction circuits are added to model body effect, then simulation accuracy improves, but model complexity increases
Solution Approach 1:
The model incorporates voltage-dependent parameters that change with body voltage. Correction coefficients and parasitic diode characteristics are dynamically adjusted based on the applied body voltage, enabling the model to accurately predict resistance variations without requiring a completely different circuit structure for each voltage condition.
Solution Approach 2:
The three-terminal resistor model serves multiple functions: it models the primary resistive behavior, captures parasitic diode effects, and accounts for body effect-induced resistance changes. This multi-functional model replaces the need for separate simulation approaches for different resistor behaviors.
3Ease of operation
If two-terminal resistor models are used, then ease of simulation is maintained, but body voltage dependence of resistance cannot be captured
Solution Approach 1:
The model transitions from a two-terminal to a three-terminal configuration, adding the body terminal as a new dimension. This additional terminal enables the model to capture voltage-dependent resistance behavior while maintaining a systematic approach to simulation that builds upon familiar two-terminal models.
Data Source
AI summary
A simulation method, simulation device and a readable storage medium are disclosed, in which a correction circuit is added to an equivalent circuit model for a three-terminal circuit employed in a SPICE simulation system. The correction circuit enables simulating behavior of the resistor module, enabling the SPICE simulation system to take in account the body effect. Therefore, simulation results obtained from the simulation model and simulation parameters for the resistor module can better reflect resistor behavior with body effect in an actual circuit, resulting in effectively improved simulation accuracy of the SPICE simulation system and allowing the system to provide more accurate circuit simulation results. Fitting tests can be performed to obtain first-order, second-order and resistor-width-dependent correction coefficients for a body voltage of the resistor module. Thus dependence of resistor behavior on the body voltage can be better predicted, allowing a good reflection of resistor behavior with body effect.