Amplifier output stage with DC-shifting circuit for high-speed supply modulator

A linear amplifier, comprising:

• an amplifier stage, configured to generate a first signal and a second signal;
• a DC-shifting stage, configured to adjust a DC voltage of the first signal and a DC voltage of the second signal to generate an adjusted first signal and an adjusted second signal;
• a compensation network, configured to generate a first driving signal and a second driving signal according to the first signal, the second signal, the adjusted first signal and the adjusted second signal;
• and
• a power stage, configured to generate an output signal according to the first driving signal and the second driving signal;
• wherein the compensation network performs a high-pass filtering operation on the second signal, performs a low-pass filtering operation on the adjusted second signal, and combines a high-pass filtering result of the second signal and a low-pass filtering result of the adjusted second signal to generate the second driving signal.

A linear amplifier, comprising:

• an amplifier stage, configured to generate a first signal and a second signal;
• a DC-shifting stage, configured to adjust a DC voltage of the first signal and a DC voltage of the second signal to generate an adjusted first signal and an adjusted second signal;
• a compensation network, configured to generate a first driving signal and a second driving signal according to the first signal, the second signal, the adjusted first signal and the adjusted second signal;
• and
• a power stage, configured to generate an output signal according to the first driving signal and the second driving signal;
• wherein the compensation network comprises a first capacitor and a first resistor, a first node of the first capacitor is used to receive the first signal, a first node of the first resistor is used to receive the adjusted first signal, and a second node of the first capacitor is coupled to a second node of the first resistor;
• and the first driving signal is generated at the second node of the first capacitor or the second node of the first resistor.

A linear amplifier, comprising:

• an amplifier stage, configured to generate a first signal and a second signal;
• a DC-shifting stage, configured to adjust a DC voltage of the first signal and a DC voltage of the second signal to generate an adjusted first signal and an adjusted second signal;
• a compensation network, configured to generate a first driving signal and a second driving signal according to the first signal, the second signal, the adjusted first signal and the adjusted second signal;
• and
• a power stage, configured to generate an output signal according to the first driving signal and the second driving signal;
• wherein the compensation network comprises a second capacitor and a second resistor, a first node of the second capacitor is used to receive the second signal, a first node of the second resistor is used to receive the adjusted second signal, and a second node of the second capacitor is coupled to a second node of the second resistor;
• and the second driving signal is generated at the second node of the second capacitor or the second node of the second resistor.