H-bridge power amplifier arrangement
An H-bridge power amplifier arrangement with envelope tracking is disclosed. The power amplifier arrangement comprises four elements form the four corner bars of a first H-bridge structure with a load formed as the cross bar of the first H-bridge structure. The power amplifier arrangement further comprises a rectifier circuit coupled between the first positive power supply and the third positive power supply configured to recycle the sinking envelope current.
1. An H-bridge power amplifier arrangement with envelope tracking comprising:
a first element comprising a first, a second and a third terminals, wherein the first terminal is configured to receive an envelope signal (Ven) as a control signal, the second terminal is coupled to a first positive power supply (V H ), and the first element is configured to generate a sourcing envelope current;
a second element comprising a first, a second and a third terminals, wherein the first terminal is configured to receive an inverse-phase version of the envelope signal ( V en), the second terminal is coupled to the first positive power supply (V H ), and the second element is configured to generate a sinking envelope current to compensate a redundant sourcing current generated by the first element;
a third element comprising a first, a second and a third terminals, wherein the first terminal is configured to receive input signals (V RF ), the second terminal is coupled to the third terminal of the second element to form a first interconnection node, the third terminal is coupled to a negative power supply (V N ), and the third element is configured to amplify the received input signals, and the first interconnection node is coupled to a second positive power supply (V CM );
a fourth element comprising a first, a second and a third terminals, wherein the first terminal is configured to receive an inverse-phase version of the input signals ( V RF ), the second terminal is coupled to the third terminal of the first element to form a second interconnection node, the third terminal is coupled to the negative power supply (V N ) via a third positive power supply (V L ), and the fourth element is configured to amplify the received inverse-phase version of the input signals, and the second interconnection node is coupled to the second positive power supply (V CM );
a load coupled between the first and second interconnection nodes to form a path for both the sourcing and sinking envelope currents; wherein the first, second, third and fourth elements form the four corner bars of a first H-bridge structure with the load formed as the cross bar of the first H-bridge structure; and
the H-bridge power amplifier arrangement further comprising:
a rectifier circuit coupled between the first positive power supply (V H ) and the third positive power supply (V L ) configured to recycle the sinking envelope current by converting a redundant sinking current power to a direct current, DC, voltage and feeding the DC voltage to the first positive power supply (V H ) with the same voltage level.
2. The power amplifier arrangement according to claim 1 , wherein the voltages of the first, second and third positive power supplies (V H , V CM , V L ) are ranging in high, middle and low levels with respect to each other.
3. The power amplifier arrangement according to claim 1 , wherein the first, second, third and fourth elements are transistors or switches.
4. The power amplifier arrangement according to claim 3 , wherein the first and third elements are controlled to be on, the second and fourth elements are controlled to be off.
5. The power amplifier arrangement according to claim 3 , wherein the first and second elements are controlled to be off, the third and fourth elements are controlled to be on.
6. The power amplifier arrangement according to claim 3 , wherein the first, second third and fourth elements are controlled to be on.
7. The power amplifier arrangement according to claim 1 , wherein the input signals are analog radio frequency signals, whose frequency is much higher than the envelope signal frequency.
8. The power amplifier arrangement according to claim 1 , wherein the input signals are binary digital signals.
9. The power amplifier arrangement according to claim 1 , wherein the input signals are digital signals comprising multiple levels.
10. The power amplifier arrangement according to claim 9 , wherein the power amplifier arrangement comprises multiple H-bridge structures in cascade, and wherein the power amplifier arrangement comprises more than four elements to form the four corner bars of H-bridge structures cascaded with the four corner bars of the first H-bridge structure.
11. An electronic circuit comprising a power amplifier arrangement according to claim 1 .
12. An electronic apparatus comprising a power amplifier arrangement according to claim 1 .
13. The electronic apparatus according to claim 12 , wherein the electronic apparatus is a wireless communication device for a cellular communication system.
14. The electronic apparatus according to claim 12 , wherein the electronic apparatus is a radio base station for a cellular communication system.