Single-stage boost class-D amplifier

A boost class-D amplifier comprising:

• a PWM (pulse width modulation) modulator configured to receive an input signal and generate a first modulated signal accordingly;
• a boost level controller coupled to the PWM modulator, configured to receive the first modulated signal and generate a second modulated signal accordingly;
• a pre-driver coupled to the PWM modulator and the boost level controller and configured to receive the first modulated signal and the second modulated signal and generate a first control signal, a second control signal, a third control signal and a forth control signal accordingly;
• a system voltage source configured to provide a system voltage;
• an inductor coupled to the system voltage source;
• a first switch comprising:
• a first terminal coupled to the inductor;
• a second terminal;
• and
• a control terminal coupled to the pre-driver and configured to receive the first control signal;
• a second switch comprising:
• a first terminal coupled to the inductor;
• a second terminal;
• and
• a control terminal coupled to the pre-driver and configured to receive the second control signal;
• a third switch comprising:
• a first terminal coupled to the second terminal of the first switch;
• a second terminal;
• and
• a control terminal coupled to the pre-driver and configured to receive the third control signal;
• a fourth switch comprising:
• a first terminal coupled to the second terminal of the second switch;
• a second terminal;
• and
• a control terminal coupled to the pre-driver and configured to receive the fourth control signal;
• a first diode coupled between the second terminal of the third switch and a voltage ground;
• a second diode coupled between the second terminal of the fourth switch and the voltage ground;
• and
• a capacitor coupled between the second terminal of the first switch and the first terminal of the fourth switch.