Transceiver and wireless communication apparatus including the same
A transceiver includes a phase shifter configured to adjust phase of a receive signal input at a first node of the phase shifter to provide an output receive signal output from a second node of the phase shifter in a receive mode, and to adjust phase of a transmit signal input at the first node to provide an output transmit signal at the second node in a transmit mode.
1 . A transceiver comprising:
a phase shifter configured to:
adjust phase of a receive signal input at a first node of the phase shifter to provide an output receive signal at a second node of the phase shifter in a receive mode; and
adjust phase of a transmit signal input at the first node to provide an output transmit signal at the second node in a transmit mode,
wherein the phase shifter comprises:
a coupler configured to output the receive signal and the transmit signal input to an input terminal as single ended signals having a phase difference with respect to each other;
variable gain amplifiers configured to amplify and output a corresponding one of the single ended signals, which is output from an output terminal of the coupler; and
at least one balun between the coupler and the variable gain amplifiers or between the variable gain amplifiers and the second node.
2 . The transceiver of claim 1 , further comprising:
a low noise amplifier configured to amplify the output receive signal, which is received from a corresponding antenna within an antenna array, and output an amplified output receive signal to the phase shifter in the receive mode;
a receive mixer configured to downconvert the output receive signal output from the phase shifter in the receive mode;
a transmit mixer configured to upconvert a signal to thereby generate the output transmit signal in the transmit mode; and
a power amplifier configured to amplify the transmit signal output from the phase shifter and output the amplified output transmit signal to an associated antenna from the antenna array in the transmit mode.
3 . The transceiver of claim 2 , further comprising:
a first switch configured to connect the first node of the phase shifter to one of the low noise amplifier or the transmit mixer, in response to a mode signal; and
a second switch configured to connect the second node of the phase shifter to one of the receive mixer or the power amplifier, in response to the mode signal.
4 . The transceiver of claim 3 , further comprising transmit/receive control circuitry configured to generate the mode signal and to transmit the mode signal to the first switch and the second switch.
5 . The transceiver of claim 3 , wherein the low noise amplifier and the power amplifier share a first antenna from the antenna array, and the transceiver further comprising a third switch configured to connect the first antenna to one of the low noise amplifier or the power amplifier, in response to the mode signal.
6 . The transceiver of claim 2 , wherein the phase shifter is positioned between a first imaginary straight line connecting an input terminal to an output terminal of the low noise amplifier and a second imaginary straight line connecting an input terminal to an output terminal of the power amplifier.
7 . The transceiver of claim 6 , wherein the phase shifter has an input at the first node and an output at the second node, and the phase shifter is positioned such that a third imaginary straight line connects the first node to the second node, the third imaginary straight line being perpendicular to the first imaginary straight line and the second imaginary straight line.
8 . The transceiver of claim 6 , wherein the phase shifter has an input at the first node and an output at the second node, and the phase shifter is positioned such that a third imaginary straight line connects the first node to the second node, the third imaginary straight line being non-perpendicular to each of the first imaginary straight line and the second imaginary straight line.
9 . The transceiver of claim 2 , wherein the low noise amplifier and the power amplifier are spaced apart from each other in a first direction, and the phase shifter is positioned such that an imaginary straight line connects the first node to the second node in a second direction which is perpendicular to the first direction.
10 . The transceiver of claim 2 , further comprising a fourth switch connecting the first node to a common routing line or the second node to the common routing line, in response to a mode signal.
11 . The transceiver of claim 1 , wherein the phase shifter is one of a plurality of phase shifters, each coupled to a corresponding antenna included in an antenna array, and each outputting an output receive signal in the receive mode, and in the transmit mode, each receiving a transmit signal.
12 . The transceiver of claim 11 , further comprising:
a combiner configured to combine the output receive signal output from the plurality of phase shifters to provide a combined signal in the receive mode; and
a divider configured to divide one signal into the transmit signals input to the plurality of phase shifters in the transmit mode.
13 . A transceiver comprising: a receive chain configured to receive a receive signal of a first frequency band through an antenna; and a transmit chain configured to transmit a transmit signal through an antenna, wherein the receive chain and the transmit chain share a phase shifter, wherein the receive chain comprises a receive mixer configured to downconvert the receive signal output from the phase shifter into a baseband receive signal in a receive mode; wherein the transmit chain comprises a transmit mixer configured to upconvert the baseband receive signal to thereby generate the transmit signal in a transmit mode; and wherein the transceiver further comprises: a first switch configured to selectively connect an input node of the phase shifter to a low noise amplifier or the transmit mixer; and a second switch configured to selectively connect an output node of the phase shifter to the receive mixer or a power amplifier, wherein the phase shifter comprises: a coupler configured to output the receive signal and the transmit signal input to an input terminal as single ended signals having a phase difference with respect to each other; variable gain amplifiers configured to amplify and output a corresponding one of the single ended signals, which is output from an output terminal of the coupler; and at least one balun between the coupler and the variable gain amplifiers or between the variable gain amplifiers and the output node.
14 . The transceiver of claim 13 , wherein when the receive chain is activated, the phase shifter adjusts the phase of the receive signal, which is input to an input node to be output from the output node, and when the transmit chain is activated, the phase shifter adjusts the phase of the transmit signal input to the input node to be output from the output node.
15 . The transceiver of claim 13 , wherein the receive chain further comprises a low noise amplifier configured to amplify the receive signal received from the antenna and transmit the amplified receive signal to the phase shifter, the transmit chain further comprises a power amplifier configured to amplify the transmit signal, which is output from the phase shifter, and to output the amplified transmit signal to the antenna, and the low noise amplifier and the power amplifier are spaced apart from each other in a first direction.
16 . The transceiver of claim 15 , wherein the vector sum passive phase shifter is positioned such that an imaginary straight line connecting an input node to an output node to is in a second direction which is perpendicular to the first direction.
17 . A wireless communication apparatus comprising:
a transceiver configured to operate in one of a receive mode or a transmit mode at a given time, in response to a mode signal; and
a communication modem configured to generate the mode signal and provide the mode signal to the transceiver,
wherein the transceiver comprises a phase shifter configured to adjust phase of a receive signal input at a first node of the phase shifter to provide an output receive signal at a second node of the phase shifter in the receive mode, and to adjust phase of a transmit signal input at the first node to provide an output transmit signal at the second node in the transmit mode, and
wherein the shared vector sum passive phase shifter comprises:
a coupler configured to output the receive signal and the transmit signal input to an input terminal as single ended signals having a phase difference with respect to each other;
variable gain amplifiers configured to amplify and output a corresponding one of the single ended signals, which is output from an output terminal of the coupler; and
at least one balun between the coupler and the variable gain amplifiers or between the variable gain amplifiers and the second node.
18 . The wireless communication apparatus of claim 17 , wherein the communication modem generates the mode signal based on a beam forming control signal received from an exterior base station through a Physical Downlink Control Channel (PDCCH).