How to build a inverter similar circuit with MOSFETS which involves negative output voltage?

[henry kissinger]

How to build the following circuit?
When input is rising from 0V to 1V, output drop from 0V to -1V.
when input is dropping from 1V to 0V, output rise from -1V to 0V

 

[KlausST]

Hi,

Analog: OPAMP
Switching fixed logic levels: use an analog switch / MUX.

For sure it depends o a lot of parameters. like waveform, delay time, noise, current..

more detailed answers require more detailed infromatins.

Klaus

 

[FvM]

Not completely clear if your asking about analog or digital function. An inverting OP circuit would also work for digital signals, but a transistor level shifter can be a simpler solution. Minimal a PNP in common base circuit.

 

[d123]

Hi,

Look for MOSFET charge pumps, lots of app notes and ICs with examples. Capacitative and basically like clockwork 'alternating between bucket filling and emptying'. Efficiency is poor, compared to e.g. Buck converter. Charge pumps are high Zout, and Cout influences this also.

See 7660 - typical negative charge pump IC, max load = - 20mA (but be saddened by - Vout droop at that load). Others can reach - 100mA.

Challenge would be to use clk and !clk to charge output capacitor (so other 50% of clk cycle no longer 'wasted' and Vout therefore allowed to droop less) with error amplifier feedback using Vin as Vreg.

 

[barry]

Maybe this is a comparator, maybe an opamp, maybe a digital switch. The description is too vague.

 

[Easy peasy]

look up - inverting op-amp circuit on the net - you will need split supplies, e.g. -5V, 0, +5V