# US 9,438,302 B2 · Radio frequency switching module and control method thereof

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- Number: US 9,438,302 B2
- Document ID: US9438302B2
- Status: Granted
- Kind: B2
- Application number: 14/636,189
- Filed: 2015-03-03
- Published: 2015-10-22
- Granted: 2016-09-06
- Earliest claimed: 2014-04-21
- Assignees: RichWave Technology Corp.
- Applicants: RichWave Technology Corp.
- Inventors: Chih-Sheng Chen
- Web page: https://patentgrep.com/patent/US9438302B2

## CPC

- H04B 1/44: Transmit/receive switching
- H04W 52/0274: {by switching on or off the equipment or parts thereof}
- H04B 1/525: with means for reducing leakage of transmitter signal into the receiver
- Y02D 30/70: in wireless communication networks
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A radio frequency (RF) switching module and a control method of the RF switching module are described. The RF switching module has 2 switches, and the control method includes starting to turn off a first switch of the RF switching module, starting to turn on a second switch of the RF switching module after the first switch is turned off for a first predetermined time, wherein starting to turn off the first switch and starting to turn on the second switch is finished during a transition period from a first mode to a second mode.

## Claims

### Claim 1

A control method of a radio frequency (RF) switching module, the RF switching module comprising a first switch coupled between a common port and a first port, and a second switch coupled between the common port and a second port, wherein the RF switching module is applied to switching between a first mode and a second mode, the first switch is turned on and the second switch is turned off in the first mode, and the first switch is turned off and the second switch is turned on in the second mode, the method comprising:
providing a first turning-off signal to the first switch when the RF switching module is in the first mode;
providing a first turning-on signal to the second switch after the first turning-off signal is provided for a first predetermined time; and
switching the RF switching module from the first mode to the second mode according to the first turning-on signal.

### Claim 2 (depends on 1)

The control method of the claim 1, wherein the RF switching module further comprises a third switch coupled between the second port and ground and a fourth switch coupled between the first port and the ground, wherein the third switch is turned on and the fourth switch is turned off in the first mode, and the third switch is turned off and the fourth switch is turned on in the second mode, the control method further comprising:
providing the first turning-off signal to the third switch when the RF switching module is in the first mode; and
providing the first turning-on signal to the fourth switch after the first turning-off signal is provided for the first predetermined time.

### Claim 3 (depends on 2)

The control method of the claim 2, further comprising:
providing a second turning-off signal to the second switch and the fourth switch when the RF switching module is in the second mode;
providing a second turning-on signal to the first switch and the third switch after the second turning-off signal is provided for a second predetermined time; and
switching the RF switching module from the second mode to the first mode according to the second turning-on signal.

### Claim 4 (depends on 1)

The control method of the claim 1, further comprising:
providing a second turning-off signal to the second switch when the RF switching module is in the second mode;
providing a second turning-on signal to the first switch after the second turning-off signal is provided for a second predetermined time.

### Claim 5

An RF switching module, comprising:
a first switch coupled between a common port and a first port;
a second switch coupled between the common port and a second port; and
a control signal generation module for providing a first turning-off signal and a first turning-on signal;
wherein the RF switching module is applied to switching between a first mode and a second mode, the first switch is turned on and the second switch is turned off in the first mode, and the first switch is turned off and the second switch is turned on in the second mode;
wherein the first turning-off signal is provided to the first switch when the RF switching module is in the first mode, and the first turning-on signal is provided to the second switch after the first turning-off signal is provided for a first predetermined time to make the RF switching module be switched from the first mode to the second mode.

### Claim 6 (depends on 5)

The RF switching module of claim 5, further comprising:
a third switch coupled between the second port and ground; and
a fourth switch coupled between the first port and the ground;
wherein the third switch is turned on and the fourth switch is turned off in the first mode, and the third switch is turned off and the fourth switch is turned on in the second mode;
wherein the first turning-off signal is also provided to the third switch when the RF switching module is in the first mode, and the first turning-on signal is also provided to the fourth switch after the first turning-off signal is provided for the first predetermined time to make the RF switching module be switched from the first mode to the second mode.

### Claim 7 (depends on 6)

The RF switching module of claim 6, wherein a second turning-off signal is provided to the second switch and the fourth switch by the control signal generation module when the RF switching module is in the second mode, and a second turning-on signal is provided to the first switch and the third switch by the control signal generation module after the second turning-off signal is provided for a second predetermined time to make the RF switching module be switched from the second mode to the first mode.

### Claim 8 (depends on 7)

The RF switching module of claim 7, wherein the first predetermined time is greater than the second predetermined time, the first mode is a transmitting mode, and the second mode is a receiving mode.

### Claim 9 (depends on 5)

The RF switching module of claim 5, wherein the first predetermined time is equal to or greater than a product of a resistance of a gate resistor of the first switch and a capacitance of an equivalent gate capacitor of the first switch.

### Claim 10 (depends on 5)

The RF switching module of claim 5, wherein the first predetermined time is equal to or greater than a time for making a gate voltage of the first switch lower than a threshold voltage of the first switch.

### Claim 11 (depends on 5)

The RF switching module of claim 5, wherein the first predetermined time is equal to or greater than a time for making a gate voltage of the first switch lower than half a sum of a highest gate voltage of the first switch and a lowest gate voltage of the first switch.

### Claim 12 (depends on 6)

The RF switching module of claim 6, wherein the control signal generation module is further used for generating a first control signal and a second control signal, wherein the control signal generation module comprises:
a first delay unit for generating and outputting a first delay signal according to an input signal and the first predetermined time;
a first AND gate coupled to the first delay unit and the first switch and the third switch for generating and outputting the first control signal to the first switch and the third switch according to the input signal and the first delay signal;
a second delay unit for generating and outputting a second delay signal according to the input signal and the second predetermined time;
a first inverter for generating an inverse signal according to the input signal;
a second inverter coupled to the second delay unit for generating an inverse delay signal according to the second delay signal; and
a second AND gate coupled to the first inverter, the second inverter, the second switch, and the fourth switch for generating and outputting the second control signal to the second switch and the fourth switch according to the inverse signal and the inverse delay signal;
wherein the first control signal comprises the first turning-off signal and the second turning-on signal, and the second control signal comprises the first turning-on signal and the second turning-off signal.

### Claim 13 (depends on 6)

The RF switching module of claim 6, wherein the first switch, the third switch, the second switch, and the fourth switch are metal-oxide-semiconductor field effect transistors; the first turning-off signal and the second turning-on signal control turning-on or turning off of the first switch and the third switch through adjusting biases of a gate of the first switch and a gate of the third switch, or through adjusting a voltage drop between a source/drain and the gate of the first switch and a voltage drop between a source/drain and the gate of the third switch; and the first turning-on signal and the second turning-off signal control turning-on or turning off of the second switch and the fourth switch through adjusting biases of a gate of the second switch and a gate of the fourth switch, or through adjusting a voltage drop between a source/drain and the gate of the second switch and a voltage drop between a source/drain and the gate of the fourth switch.

### Claim 14 (depends on 5)

The RF switching module of claim 5, wherein the first switch, the second switch, the third switch, and the fourth switch are silicon on insulator (SOI) transistors or high-electron-mobility transistors.

### Claim 15 (depends on 5)

The RF switching module of claim 5, wherein a second turning-off signal is provided to the second switch by the control signal generation module when the RF switching module is in the second mode, and a second turning-on signal is provided to the first switch by the control signal generation module after the second turning-off signal is provided for a second predetermined time to make the RF switching module be switched from the second mode to the first mode.

### Claim 16 (depends on 5)

The RF switching module of claim 5, wherein the control signal generation module is further used for generating a first control signal and a second control signal, wherein the control signal generation module comprises:
a first delay unit for generating and outputting a first delay signal according to an input signal and the first predetermined time;
a first AND gate coupled to the first delay unit and the first switch for generating and outputting the first control signal to the first switch according to the input signal and the first delay signal;
a second delay unit for generating and outputting a second delay signal according to the input signal and the second predetermined time;
a first inverter for generating an inverse signal according to the input signal;
a second inverter coupled to the second delay unit for generating an inverse delay signal according to the second delay signal; and
a second AND gate coupled to the first inverter, the second inverter, and the second switch for generating and outputting the second control signal to the second switch according to the inverse signal and the inverse delay signal;
wherein the first control signal comprises the first turning-off signal and the second turning-on signal, and the second control signal comprises the first turning-on signal and the second turning-off signal.

### Claim 17 (depends on 5)

The RF switching module of claim 5, wherein the first switch and the second switch are metal-oxide-semiconductor field effect transistors; the first turning-off signal and the second turning-on signal control turning-on or turning off of the first switch through adjusting biases of a gate of the first switch, or through adjusting a voltage drop between a source/drain and the gate of the first switch; and the first turning-on signal and the second turning-off signal control turning-on or turning off of the second switch through adjusting biases of a gate of the second switch, or through adjusting a voltage drop between a source/drain and the gate of the second switch.

### Claim 18 (depends on 5)

The RF switching module of claim 5, wherein the first switch, the second switch are silicon on insulator (SOI) transistors or high-electron-mobility transistors.