folder_name stringlengths 19 66 | question stringlengths 95 241 | answer stringlengths 353 1.14k | image_path dict | image_name stringlengths 13 13 ⌀ |
|---|---|---|---|---|
part1-001-double-length-and-width-mosfet-its-intrinsic | # part1-001-double-length-and-width-mosfet-its-intrinsic
## Question
If we double the length and width of a MOSFET, what happens to its intrinsic gain? | # Golden Solution - part1-001-double-length-and-width-mosfet-its-intrinsic
The intrinsic gain is `Av,int = gm ro`.
If both `W` and `L` are doubled while the overdrive voltage is kept constant, `W/L` is unchanged, so `gm` is approximately unchanged. The drain current is also approximately unchanged, while `ro = 1/(lam... | null | null |
part1-002-student-says-transconductance-mosfet-goes-up-as | # part1-002-student-says-transconductance-mosfet-goes-up-as
## Question
Student A says the transconductance of a MOSFET goes up as the overdrive voltage increases. Student B says it goes down. Who is correct? | # Golden Solution - part1-002-student-says-transconductance-mosfet-goes-up-as
Both statements can be true, depending on what is held fixed.
For a long-channel MOSFET in saturation,
`gm = mu Cox (W/L) Vov = 2 ID / Vov`.
If `W/L` is fixed and `Vov` is increased, then `ID` rises as `Vov^2` and `gm` increases linearly ... | null | null |
part1-003-small-signal-model-pmos-device-identical-nmos | # part1-003-small-signal-model-pmos-device-identical-nmos
## Question
Is the small-signal model of a PMOS device identical to that of an NMOS device? | # Golden Solution - part1-003-small-signal-model-pmos-device-identical-nmos
Yes, the small-signal model has the same form after using consistent voltage and current polarities.
A PMOS has `gm`, `gmb`, `ro`, and terminal capacitances analogous to an NMOS. The controlled source direction and sign conventions are revers... | null | null |
part1-004-sketch-ix-versus-vx | # part1-004-sketch-ix-versus-vx
## Question
Sketch IX versus VX in the circuit in Figure 1.
## Figures
 | # Golden Solution - part1-004-sketch-ix-versus-vx
The transistor is diode-connected with its gate and drain tied to `VX`, source at ground. For `VX <= VTH`, the device is off and `IX` is approximately zero.
For `VX > VTH`, the device operates in saturation because `VDS = VGS = VX`, so
`IX ~= (1/2) mu Cox (W/L) (VX -... | {
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part1-005-sketch-ix-versus-vx | # part1-005-sketch-ix-versus-vx
## Question
Sketch IX versus VX in the circuit of Figure 2.
## Figures
 | # Golden Solution - part1-005-sketch-ix-versus-vx
In Figure 2, `VX` is applied to the gate, the source is grounded, and the drain is held at `1 V`. Thus `VGS = VX` and `VDS = 1 V`.
For `VX <= VTH`, the transistor is off and `IX ~= 0`.
For `VTH < VX < VTH + 1 V`, the condition `VDS >= VGS - VTH` is satisfied, so the ... | {
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part1-006-device-act-as-current-source | # part1-006-device-act-as-current-source
## Question
Can the device shown in Figure 3 act as a current source?
## Figures
 | # Golden Solution - part1-006-device-act-as-current-source
No. The device is diode-connected, so it presents a low small-signal resistance of roughly `1/gm` rather than a high output resistance.
A good current source should maintain nearly constant current while its terminal voltage changes. Here the current is stron... | {
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part1-007-pmos-common-source-source-degeneration | "# part1-007-pmos-common-source-source-degeneration\n\n## Question\n\nAnalyze the circuit shown in F(...TRUNCATED) | "# Golden Solution - part1-007-pmos-common-source-source-degeneration\n\nFigure 4 is a PMOS common-s(...TRUNCATED) | {"bytes":"iVBORw0KGgoAAAANSUhEUgAABT4AAANyCAYAAABL5NSMAAAEDmlDQ1BrQ0dDb2xvclNwYWNlR2VuZXJpY1JHQgAAOI(...TRUNCATED) | figure-04.png |
part1-008-source-follower | "# part1-008-source-follower\n\n## Question\n\nAnalyze the circuit shown in Figure 5.\n\n## Figures\(...TRUNCATED) | "# Golden Solution - part1-008-source-follower\n\nFigure 5 is a source follower. The input is applie(...TRUNCATED) | {"bytes":"iVBORw0KGgoAAAANSUhEUgAABEwAAANSCAYAAAB/elvfAAAEDmlDQ1BrQ0dDb2xvclNwYWNlR2VuZXJpY1JHQgAAOI(...TRUNCATED) | figure-05.png |
part1-009-common-gate-source-input | "# part1-009-common-gate-source-input\n\n## Question\n\nAnalyze the circuit shown in Figure 6.\n\n##(...TRUNCATED) | "# Golden Solution - part1-009-common-gate-source-input\n\nIn Figure 6, `Vin` is applied to the sour(...TRUNCATED) | {"bytes":"iVBORw0KGgoAAAANSUhEUgAABD4AAANQCAYAAADADq9xAAAEDmlDQ1BrQ0dDb2xvclNwYWNlR2VuZXJpY1JHQgAAOI(...TRUNCATED) | figure-06.png |
part1-010-source-input-shorted-to-ground | "# part1-010-source-input-shorted-to-ground\n\n## Question\n\nAnalyze the circuit shown in Figure 7.(...TRUNCATED) | "# Golden Solution - part1-010-source-input-shorted-to-ground\n\nIn Figure 7, `Vin` is coupled throu(...TRUNCATED) | {"bytes":"iVBORw0KGgoAAAANSUhEUgAABRYAAARWCAYAAABO9O4GAAAEDmlDQ1BrQ0dDb2xvclNwYWNlR2VuZXJpY1JHQgAAOI(...TRUNCATED) | figure-07.png |
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