Complementary Metal Oxide Semiconductor Differential Antenna Transmit-Receive Switches with Power Combining Circuitry for Orthogonal Frequency-Division Multiplexing Systems
A radio frequency (RF) transmit-receive switch has an antenna port, first and second transmit differential ports and first and second receive differential ports. Transmit transistor switches are connected to the transmit differential ports. Primary and secondary windings of a transmit coupled inductor transformer are connected to the transmit transistor switches. Receive transistor switches are connected to the receive differential ports. Primary and secondary windings of a receive coupled inductor transformer are connected to the receive transistor switches. A first balun inductive winding is connected to the antenna port, and a second balun inductive winding is connected to the transistor switches.
1 - 24 . (canceled)
25 . A radio frequency transmit-receive switch comprising:
a differential transmit circuit including a first amplifier stage and a second amplifier stage each connected to a transmit transformer;
a differential receive circuit including a first receive switch and a second receive switch each connected to a receive transformer; and
a balun connected to the transmit transformer of the differential transmit circuit and the receive transformer of the differential receive circuit, and defining an antenna port.
26 . The radio frequency transmit-receive switch of claim 25 wherein the transmit transformer includes a primary winding with first and second terminals, and a secondary winding with first and second terminals.
27 . The radio frequency transmit-receive switch of claim 26 wherein the first amplifier stage includes a first transmit transistor with a gate connected to a first transmit differential port, a source connected to ground, and a drain connected to the first terminal of the primary winding.
28 . The radio frequency transmit-receive switch of claim 26 wherein the second amplifier stage includes a second transmit transistor with a gate connected to a second transmit differential port, a source connected to ground, and a drain connected to the first terminal of the secondary winding, wherein the second terminal of the primary winding is connected to the second terminal of the secondary winding.
29 . The radio frequency transmit-receive switch of claim 25 wherein the receive transformer includes a primary winding with a first pair of terminals, and a secondary winding with a second pair of terminals.
30 . The radio frequency transmit-receive switch of claim 29 wherein the first receive switch includes a first receive transistor connected across the first pair of terminals of primary winding.
31 . The radio frequency transmit-receive switch of claim 29 wherein the second receive switch includes a second receive transistor connected across the second pair of terminals of the primary winding.
32 . The radio frequency transmit-receive switch of claim 25 wherein the balun is defined by a first winding and a second winding.
33 . The radio frequency transmit-receive switch of claim 32 wherein the transmit transformer and the receive transformer are connected to the second winding of the balun.
34 . The radio frequency transmit-receive switch of claim 32 wherein the first winding of the balun is connected to the antenna port.
35 . The radio frequency transmit-receive switch of claim 25 further comprising a control module connected to the first receive switch and the second receive switch for selective activation and deactivation thereof.
36 . The radio frequency transmit-receive switch of claim 25 further comprising a power supply transformer with a first winding and a second winding, the first winding having a first terminal connected to a power supply voltage and a second terminal connected to the first amplifier stage, the second winding having a first terminal connected to the power supply voltage and a second terminal connected to the second amplifier stage.
37 . The radio frequency transmit-receive switch of claim 36 , wherein the first amplifier stage includes a first transmit transistor with a gate connected to a first transmit differential port, a source connected to ground, and a drain connected to the transmit transformer, wherein the second terminal of the first winding of the power supply transformer is connected to the drain of the first transmit transistor.
38 . The radio frequency transmit-receive switch of claim 37 , wherein the second amplifier stage includes a second transmit transistor with a gate connected to a second transmit differential port, a source connected to ground, and a drain connected to the transmit transformer, wherein the second terminal of the second winding of the power supply transformer is connected to the drain of the second transmit transistor.
39 . The radio frequency transmit-receive switch of claim 25 , wherein the radio frequency transmit-receive switch can be set to a transmit mode and a receive mode.
40 . The radio frequency transmit-receive switch of claim 39 , wherein, in the receive mode, the first amplifier stage and the second amplifier stage are deactivated.
41 . The radio frequency transmit-receive switch of claim 39 , wherein, in the transmit mode, the first receive switch and the second receive switch are deactivated.
42 . A radio frequency switch circuit comprising:
a transmit circuit with a first power amplifier stage for a first differential input, a second power amplifier stage for a second differential input, and a transmit transformer with a first winding connected to the first power amplifier stage and a second winding connected to the second power amplifier stage;
a receive circuit with a first output switch for a first differential output, a second output switch for a second differential output, and a receive transformer with a first winding connected to the first output switch and a second winding connected to the second output switch; and
a balun connected to the transmit circuit and the receive circuit.
43 . The radio frequency front end circuit of claim 42 wherein the balun is defined by a first winding connected to an antenna port, and a second winding connected to the transmit circuit and the receive circuit.
44 . The radio frequency front end circuit of claim 43 wherein the second winding of the balun is defined by a first end and a second end, the transmit circuit being connected to the first end of the second winding of the balun and the receive circuit being connected to the second end of the second winding of the balun.