Amplifying device
View Patent ↗The present invention concerns an amplifying device arranged to receive an input signal having a certain duty cycle. The amplifying device comprise a first switching unit having an input terminal adapted to receive a first half of the input signal, and an output terminal adapted to be connected to a first signal output where a first half of an output signal is provided. The amplifying device comprise a second switching unit having an input terminal adapted to receive a second half of the input signal and an output terminal adapted to be connected to a second signal output where a second half of the output signal is provided. Also, the first switching unit and the second switching units are adapted to receive an input signal, wherein the first half of said input signal has the same duty cycle as the second half of the input signal but shifted in phase. The present invention also concerns a wireless transceiver and a radio transmission device.
1. An amplifying device arranged to receive an input signal having a certain duty cycle, said amplifying device comprising:
a first switching unit having an input terminal adapted to receive a first half of the input signal, and an output terminal adapted to be connected to a first signal output where a first half of an output signal is provided,
a second switching unit having an input terminal adapted to receive a second half of the input signal and an output terminal adapted to be connected to a second signal output where a second half of the output signal is provided, the amplifying device being characterized by:
the first switching unit and the second switching unit being adapted to receive an input signal, wherein the first half of said input signal has the same duty cycle as the second half of the input signal but shifted in phase, and
said amplifying device further comprises:
a first reactive element having a first terminal and a second terminal, wherein the first terminal of the first reactive element is directly connected to the output terminal of the first switching unit and the second terminal of the first reactive element is directly connected to the output terminal of the second switching unit.
2. The amplifying device according to claim 1 , wherein the input signal is split into a first half of the input signal and a second half of the input signal by a signal splitting unit.
3. The amplifying device according to claim 1 , wherein the first half of the input signal has the same duty cycle as the second half of the input signal but shifted in phase by a phase shifting unit.
4. The amplifying device according to claim 1 , wherein the input signal is a symmetric input signal, such that the first half of said input signal has the same duty cycle as the second half of the input signal but shifted 180 degrees in phase.
5. The amplifying device according to claim 1 , wherein the amplifying device further comprises:
a second reactive element having a first terminal and a second terminal, wherein the first terminal of the second reactive element is directly connected to the output terminal of the first switching unit; and
a third reactive element having a first terminal and a second terminal, wherein the first terminal of the third reactive element is directly connected to the output terminal of the second switching unit.
6. The amplifying device according to claim 5 , wherein the second terminal of the second reactive element is connected to a ground node, the second terminal of the third reactive element is connected to the ground node, and the first reactive element is a capacitor and the second reactive element is a capacitor.
7. The amplifying device according to claim 6 , wherein the first reactive element is an inductor.
8. The amplifying device according to claim 1 , wherein the switching units are provided in the form of biased conducted switching units.
9. The amplifying device according to claim 1 , wherein the switching units are provided in the form of MOSFET transistors.
10. A wireless transceiver comprising at least one amplifying device according to claim 1 .
11. A radio transmission device comprising at least one amplifying device according to claim 1 .
12. A radio transmission device according to claim 11 , wherein the radio transmission device is a wireless access point.
13. A radio transmission device according to claim 11 , wherein the radio transmission device is a wireless terminal.