andrea_mori
Member level 2
I need a tri state discrete MOSFET switch, to switch among +V, -V and GND.
I thought to use a couple of complementary mosfet pair as in the attached image.
In the first state 1) +5V the bottom pair is open (high impedance), while the P-Channel mosfet of the top pair is on, output is +5V.
In the second state 2) -5V the top pair is open (high impedance), while the N-Channel mosfet of the bottm pair is on, output is -5V.
In the third state 3) GND the P-Channel mosfet of the top pair and the N-channel of the bottom pair are off, while the N-Channel mosfet of the top pair and the P-channel of the bottom pair are off, output is ground.
Is that correct? Is there a problem of leakage current when one of the pair is high impedance (bottom pair when output is +5V, top pair when output is -5V)?
Thanks for your suggestions.
Andrea
I thought to use a couple of complementary mosfet pair as in the attached image.
In the first state 1) +5V the bottom pair is open (high impedance), while the P-Channel mosfet of the top pair is on, output is +5V.
In the second state 2) -5V the top pair is open (high impedance), while the N-Channel mosfet of the bottm pair is on, output is -5V.
In the third state 3) GND the P-Channel mosfet of the top pair and the N-channel of the bottom pair are off, while the N-Channel mosfet of the top pair and the P-channel of the bottom pair are off, output is ground.
Is that correct? Is there a problem of leakage current when one of the pair is high impedance (bottom pair when output is +5V, top pair when output is -5V)?
Thanks for your suggestions.
Andrea