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| resistor [2012/07/01 22:04] – mcmaster | resistor [2012/07/01 22:06] – mcmaster |
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| ====== Always on transistor ====== | ====== Depletion load transistor ====== |
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| These are arranged with the transistor tied to be always on. A MOSFET is classified into 3 areas of operation: | These are arranged with the transistor tied to be always on. A MOSFET is classified into 3 areas of operation: |
| {{:mcmaster:resistor:pmos_pulldown_sch.png}} | {{:mcmaster:resistor:pmos_pulldown_sch.png}} |
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| (FIXME: look into analysis. The metal is VDD (-10V). For PMOS, cutoff occurs when VGS > Vth and assume Vth = -3V or something like that. If VGS is 0 the resistor does nothing as there is no potential difference. Now note that since VG = VD and so VGS = VDS. We are in the triode region if VDS > VGS - Vth and so if 0 > 0 - -3V or 0 > 3V) | (FIXME: compare with analysis at [NMOS logic design] The metal is VDD (-10V). For PMOS, cutoff occurs when VGS > Vth and assume Vth = -3V or something like that. If VGS is 0 the resistor does nothing as there is no potential difference. Now note that since VG = VD and so VGS = VDS. We are in the triode region if VDS > VGS - Vth and so if 0 > 0 - -3V or 0 > 3V) |
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