261 Mux8onehot Pulldown Mosfet

261 : Mux8onehot Pulldown Mosfet

Design render

How it works

This circuit consists of an analog multiplexer, pull-down MOSFETs (IN1–IN8), three digital signals (SEL0, SEL1, SEL2), and three analog signals (BIAS, V_drain, V_gate). The analog multiplexer is reused from the design in tt09-analogmux.

How to test

Observe the current flowing through an NMOS transistor.

  • You can select one NMOS over 8 candidates by the analog multiplexer.
  • The gate voltage of unselected NMOSs is pulled down. .

External hardware

  • Use a source-measure unit to measure currents at V_drain port.
  • Use a voltage source to control the gate voltage of the selected NMOS.

IO

#InputOutputBidirectional
0SEL0
1SEL1
2SEL2
3
4
5
6
7

Analog pins

uaPCB PinInternal indexDescription
0B17BIAS
1B39V_drain
2B28V_gate

Chip location

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