Discussion Overview
The discussion revolves around determining the unCoxW/L value of a MOSFET, which is essential for using the MOSFET as a voltage-controlled resistor. Participants explore whether this value is available in datasheets or if it varies among different MOSFETs. The conversation includes theoretical and practical considerations regarding the use of MOSFETs in applications.
Discussion Character
- Technical explanation
- Conceptual clarification
- Debate/contested
Main Points Raised
- One participant inquires about the availability of the unCoxW/L value in datasheets and whether it is consistent across different MOSFETs.
- Another participant explains that W/L, electron mobility (µn), and oxide capacitance (Cox) are technology-dependent and that the unCoxW/L value varies among MOSFETs.
- It is suggested that transconductance values can be found in datasheets and that a SPICE model may provide the k-value needed for calculations.
- A participant emphasizes the importance of practical experience over textbook equations when working with discrete semiconductors, noting that vendors may not provide the unCoxW/L value explicitly.
- The original poster expresses concern about the necessity of the k-value in their calculations and wonders if it can be omitted in their application.
Areas of Agreement / Disagreement
Participants generally agree that the unCoxW/L value is not consistently provided by manufacturers and that it varies among different MOSFETs. However, there is no consensus on the necessity of this value for practical applications, as some suggest it may not be required while others imply it is important for accurate calculations.
Contextual Notes
Participants note that the determination of the unCoxW/L value depends on various factors, including the specific MOSFET technology and the context of its application. There is also mention of the limitations of relying solely on theoretical equations in practical scenarios.
