Switched-capacitor power amplifiers

A switched-capacitor power amplifier cell comprising:

• a first capacitor and a second capacitor;
• a first input signal line connected to the first capacitor and a second input signal line connected to the second capacitor;
• a first switch and a second switch both connected to the first input signal line, the first switch being configured for supplying a first supply voltage to the first input signal line and the second switch being configured for supplying a second supply voltage to the first input signal line;
• a third switch and a fourth switch both connected to the second input signal line, the third switch being configured for supplying the first supply voltage to the second input signal line and the fourth switch being configured for supplying the second supply voltage to the second input signal line;
• and
• a switched signal line connecting the first input signal line and the second input signal line, the switched signal line comprising a fifth switch, wherein
• in a first mode of the switched-capacitor power amplifier cell, the first switch and the second switch are configured to switch at a common frequency and out of phase with one another, the third switch and the fourth switch are configured to switch at the common frequency and out of phase with one another, the first switch and the fourth switch are configured to switch in phase with one another, the second switch and the third switch are configured to switch in phase with one another, and the fifth switch is in an open condition, and
• in a second mode the first switch and the fourth switch are configured to switch in phase with one another, the second switch and the third switch are in an open condition, and the fifth switch is configured to switch out of phase with the first switch and the fourth switch.