Transceiver having antenna-connection port and fem-connection port

Patent metadata

Field	Value
Publication number	US-2020287584-A1
Application number	US-201916699655-A
Country	US
Kind code	A1
Filing date	Dec 1, 2019
Priority date	Mar 8, 2019
Publication date	Sep 10, 2020
Grant date	—

Abstract

Exemplary embodiments provide a transceiver having an antenna-connection port and an FEM-connection port that may support a connection to an external FEM and also support a connection to an antenna without a separate RF switch when an antenna is used without an FEM.

First claim

What is claimed is:

1 . A transceiver, comprising:
an input/output common port (Rx/Tx Port) configured to receive an Rx signal or to output a Tx signal by connecting to an antenna (ANT), or to output the Tx signal by connecting to a Tx input terminal of a front-end module (FEM); an input only port (Rx Port) configured to receive the Rx signal by connecting to an Rx output port of the FEM; a low-noise amplifier (LNA) configured to form a plurality of Rx paths by connecting to the input/output common port and the input only port respectively, and configured to amplify and output the Rx signal after receiving the Rx signal using the plurality of Rx paths; a power amplifier (PA) configured to form a Tx path by connecting to the input/output common port, and configured to apply the Tx signal to the input/output common port using the Tx path; and a plurality of switching devices configured to form the Tx path and the plurality of Rx paths by performing switching between the PA and the LNA and between the input/output common port and the input only port respectively.

2 . The transceiver of claim 1 , further comprising:
a first resonance circuit and a first switch (SW 1 ) between the input/output common port and the LNA, wherein: one end of a first inductor (L 1 ) included in the first resonance circuit connects to the input/output common port, and the other end of the first inductor (L 1 ) connects to one end of the first switch (SW 1 ); the other end of the first switch (SW 1 ) connects to an input terminal of the LNA; and in case of an Rx mode operation, when the first switch (SW 1 ) is switched ON, a first Rx path along which the Rx signal, received from the antenna (ANT) connecting to the input/output common port, is inputted into the LNA via the input/output common port, the first inductor (L 1 ), and the first switch (SW 1 ) is formed.

3 . The transceiver of claim 2 , further comprising:
a second resonance circuit and a fifth switch (SW 5 ) between the input/output common port and the PA, wherein: one end of a first capacitor (C 1 ) included in the first resonance circuit connects to a contact of the input/output common port and one end of the first inductor (L 1 ), and the other end of the first capacitor (C 1 ) connects to the ground; one end of the fifth switch (SW 5 ) connects to the one end of the first capacitor (C 1 ), and the other end of the fifth switch (SW 5 ) connects to an output terminal of the PA; one end of a fourth inductor (L 4 ) included in the second resonance circuit connects to the one end of the first capacitor (C 1 ), and the other end of the fourth inductor (L 4 ) connects to the output terminal of the PA; one end of a second capacitor (C 2 ) included in the second resonance circuit connects to a contact of the one end of the first capacitor (C 1 ) and the one end of the fourth inductor (L 4 ), and the other end of the second capacitor (C 2 ) connects to a contact of the other end of the fourth inductor (L 4 ) and the other end of the fifth switch (SW 5 ); and in case of the Rx mode operation, when the fifth switch (SW 5 ) is switched OFF, the connection with the PA is severed, and a high impedance is formed due to a resonance between the fourth inductor (L 4 ) and the second capacitor (C 2 ) so that an inflow of noise outputted from the PA into the LNA is blocked.

4 . The transceiver of claim 3 , further comprising:
a transformer between the PA and the fifth switch (SW 5 ), wherein in case of a Tx mode operation, when the fifth switch (SW 5 ) is switched ON, and when a power signal, which is an input signal amplified by the PA, is outputted to a primary side of the transformer, a Tx path along which the Tx signal is outputted to the input/output common port via the PA, the transformer, and the fifth switch (SW 5 ) is formed, the Tx signal being generated by applying a current applied to the primary side of the transformer to a secondary side based on an input/output voltage ratio according to a preset turn ratio.

5 . The transceiver of claim 3 , further comprising:
a third switch (SW 3 ), a fourth switch (SW 4 ), and a shunt circuit between the first resonance circuit and the LNA, wherein: one end of the third switch (SW 3 ) connects to the other end of the first switch (SW 1 ), and the other end of the third switch (SW 3 ) connects to the ground; one end of a second inductor (L 2 ) included in the shunt circuit connects to a contact of the other end of the first switch (SW 1 ) and the one end of the third switch (SW 3 ), and the other end of the second inductor (L 2 ) connects to one end of a third inductor (L 3 ) included in the shunt circuit; the other end of the third inductor (L 3 ) connects to the ground; one end of the fourth switch (SW 4 ) connects to a contact of the other end of the second inductor (L 2 ) and the one end of the third inductor (L 3 ), and the other end of the fourth switch (SW 4 ) connects to the ground; and in case of the Tx mode operation, when the first switch (SW 1 ) and the third switch (SW 3 ) are switched ON, and when the fourth switch (SW 4 ) is switched ON or OFF, a high impedance is formed due to a resonance between the first inductor (L 1 ) and the first capacitor (C 1 ) so that an inflow of the Tx signal into the LNA is prevented.

6 . The transceiver of claim 3 , further comprising:
a second switch (SW 2 ) between the input only port and the LNA, wherein: one end of the second switch (SW 2 ) connects to the input only port, and the other end of the second switch (SW 2 ) connects to the input terminal of the LNA; and in case of the Rx mode operation, when the second switch (SW 2 ) is switched ON, a second Rx path along which the Rx signal, received from the antenna (ANT) connecting to the input/output common port, is inputted into the LNA via the input only port and via the second switch (SW 2 ) is formed.

7 . The transceiver of claim 6 , further comprising:
an electrostatic discharge (ESD) circuit, a third switch (SW 3 ), a shunt circuit, and a fourth switch (SW 4 ) between the input only port and the LNA, wherein: one end of the ESD circuit connects to a contact of the input only port and to the one end of the second switch (SW 2 ), and the other end of the ESD circuit connects to the ground; one end of the third switch (SW 3 ) connects to a contact of the other end of the second switch (SW 2 ) and the input terminal of the FEM, and the other end of the third switch (SW 3 ) connects to the ground; one end of a second inductor (L 2 ) included in the shunt circuit connects to a contact of the other end of the second switch (SW 2 ) and the input terminal of the LNA, and the other end of the second inductor (L 2 ) connects to one end of a third inductor (L 3 ) included in the shunt circuit; the other end of the third inductor (L 3 ) connects to the ground; one end of the fourth switch (SW 4 ) connects to a contact of the other end of the second inductor (L 2 ) and the one end of the third inductor (L 3 ), and the other end of the fourth switch (SW 4 ) connects to the ground; and in case of the Rx mode operation, the third switch (SW 3 ) is switched OFF, and the fourth switch (SW 4 ) is switched ON so that a parasitic capacitance formed on the second Rx path is compensated by the second inductor (L 2 ) and the third inductor (L 3 ).

8 . The transceiver of claim 7 , further comprising:
a first resonance circuit and a first switch (SW 1 ) between the input/output common port and the LNA, wherein one end of a first inductor (L 1 ) included in the first resonance circuit connects to the input/output common port, and the other end of the first inductor (L 1 ) connects to one end of the first switch (SW 1 ), and wherein the other end of the f

Assignees

• Fci Inc

Inventors

• Yoo Hee Yong

Classifications

• H04B1/0064

  with separate antennas for the more than one band (H04B1/0053 takes precedence) · CPC title

• H03F2200/294

  the amplifier being a low noise amplifier [LNA] · CPC title

• H03F3/245

  with semiconductor devices only · CPC title

• H03F2200/451

  the amplifier being a radio frequency amplifier · CPC title

• H04B1/44 Primary

  Transmit/receive switching · CPC title