A/D converter with very low power consumptaiton.

Comperators with low power consumptation using mos wilson current mirrors.

The input feed the gates on the transistors, to get low capacity on the input, and then also lower power. V1 and V2 is constant, and does not change. They are feed by a resistor network, and V2-V1 is choosen to have a fixed voltage, that guarentee very low power. It is connected into a flash converter, and uses no power at all, however it depend on how fast they should be. Since A/D converter is a flash, is it very easy to get low power and fast speed. And only the changing bit, and maybee the bits arround them do pull power. That means, that the total power is very low.

The wilson current mirror pulls a bit current because the transistors source-drain voltage is not equal, and then the way as usal is to cascade it (making voltage equal). Also, there may be done something to be sure that the output transistor have higher threeshold voltage, and thereby cut total off. Now, the comperator do not pull current at all. The comperators should always cut total off, because a lot of analog comperators else take use a lot of current. (The static current is multiplied, why it should be as low as possible.)

The output is converted into binary as on a standard flash converter, and it do not pull any current if the input not changes.

Total, the current is very low, and as on all flash converters, is no clock input needed.

If the voltage changes may all the comparators change state, and here may it pull a charge, and to reduce this Iq is it importent to use transistors with as low capacity as possible. Using a new technology typical do that only.

In the last three decades have no design efforts been made, and most people are just occopied changing from one technology to next, because the sizes of transistors not scale linear.

The bad characteristic for Widlar current mirrors have been improved to cut off for low current, and thereby decrease the offset currents. I have choosed to not "swap" the output transistors in the current mirror, because it had off cause affected the mirrored current here. The circuit does not improve the mirroring as a normal cascaded widlar, but do improve the current to much lower. (A normal cascaded widlar could easy be done by cascading the current mirrors.) Cascading do improve the offset current, the source-drain voltage now is more equal over all transistors. But the cross coubled cut-off regulate source-drain voltage lower. And cuts the offset total away.

The low resistance network to generate voltages, should be made using a very high-resistance network, decoubled. It is easy to amplify in a small opamp, with no power, and zero bias current.