Dead time circuit for a switching circuit and a switching amplifier

A switching amplifier comprising:

• an inner feedback loop;
• and
• an outer feedback loop having a loop gain and comprises a first integrator with at least one zero and a second integrator;
• wherein the inner feedback loop includes a closed-loop gain comprising the second integrator of the outer feedback loop, the closed-loop gain of the inner feedback loop having at least one pole;
• the first integrator having a reactive element configured to generate a zero to at least partially cancel the at least one pole of the closed-loop gain of the inner feedback loop.

A switching amplifier comprising:

• an inner feedback loop;
• an outer feedback loop having a loop gain and comprises a first integrator with at least one zero and a second integrator;
• wherein the inner feedback loop includes a closed-loop gain comprising the second integrator of the outer feedback loop, the closed-loop gain of the inner feedback loop having at least one pole;
• the first integrator having a reactive element configured to generate a zero to at least partially cancel the at least one pole of the closed-loop gain of the inner feedback loop;
• and
• an output stage having a dead time circuit wherein the dead time circuit comprises:
• (i) an input for receiving a switching signal of a switching circuit with at least one supply rail having a ground bounce signal;
• (ii) first and second outputs;
• (iii) a first feedforward path coupled to the first output and arranged to receive the switching signal;
• (iv) a second feedforward path coupled to the second output and arranged to receive the switching signal;
• (v) a first feedback path forming a first feedback loop between the first output and the second feedforward path;
• and
• (vi) a second feedback path forming a second feedback loop between the second output and the first feedforward path;
• wherein each of the first and second feedforward paths includes a respective first and second delay circuit, each having a time delay greater than a time period of the ground bounce signal determined according to the equation:
• t=2π(LC)^0.5,
• where t is the time period of the ground bounce signal, L is the inductance of a bonding wire and C is the capacitance of the at least one supply rail.