Switching System with Reduced EMI

An H-bridge amplifier, comprising:

• a first composite switch connected between a power supply and a first output;
• a second composite switch connected between the first output and a ground;
• a third composite switch connected between the power supply and a second output;
• a fourth composite switch connected between the second output and the ground;
• a fifth composite switch connected between the first output and the second output;
• wherein the composite switches each comprise a plurality of transistors connected in parallel, a switch closing delay line having a plurality of switch closing outputs each connected to a control input of one of the plurality of transistors, and a switch opening delay line having a plurality of switch opening outputs each connected to one of the plurality of switch closing outputs, wherein the plurality of transistors have a substantially exponential progression of different sizes, and wherein the switch closing delay line and switch opening delay line are connected in an order that opens the plurality of transistors in a staggered order in time and closes the plurality of transistors in a reverse staggered order in time, and wherein a timing of the H-bridge amplifier is adapted so that when the first, second, third and fourth composite switches are opened, an inductive current between the first output and the second output is substantially carried through the fifth composite switch;
• a first bias circuit connected to the first output;
• and
• a second bias circuit connected to the second output, wherein the bias circuits each comprise a resistor divider connected between the power supply and the ground and a transistor voltage divider connected between the power supply and the ground, wherein the resistor divider has a higher impedance than the transistor voltage divider, and wherein the H-bridge amplifier is adapted to enable the transistor voltage divider only during a transition when at least some of the first, second, third and fourth composite switches are being opened and none of the first, second, third and fourth composite switches are being left closed and the fifth composite switch is being closed.