Crosstalk prevention circuit and mobile terminal

Abstract

The application discloses an anti-crosstalk circuit, which comprises an antenna, a duplexer, a first switching unit and a second switching unit. The duplexer comprises a first end, a second end and a third end. The first end of the duplexer is electrically connected to the antenna. The first switching unit comprises a first end, a second end and a common end. The common end of the first switching unit is electrically connected to the first end of the duplexer. The second switching unit comprises a first end, a second end, a third end and a common end. The common end of the second switching unit is electrically connected to the second end of the duplexer, and the third end is grounded. The receiving end of a first signal channel of a radio frequency chip is electrically connected to the first end of the first switching unit. The transmitting end of the first signal channel is electrically connected to the second end of the first switching unit. The receiving end of a second signal channel is electrically connected to the first end of the second switching unit. The transmitting end of the second signal channel is electrically connected to the second end of the second switching unit. The isolation between the signal channels is increased, and the strength of crosstalk signals is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to an anti-crosstalk circuit and a mobile terminal. Background Technology

[0002] In recent years, with the development of technology, terminal devices have become increasingly powerful. To ensure the size of these devices, chip designs have become smaller and smaller to save space. As chip designs become smaller, the distance between chip pins also decreases. When the chip is a radio frequency (RF) chip, the RF signal pins are adjacent. If the layout is not handled properly, crosstalk can occur between different signal channels, affecting communication quality. Summary of the Invention

[0003] Therefore, it is necessary to provide an anti-crosstalk circuit to increase the isolation between signal channels and reduce the strength of crosstalk signals.

[0004] An embodiment of the present invention provides an anti-crosstalk circuit, comprising:

[0005] Antennas are used to receive and transmit signals;

[0006] A duplexer includes a first end, a second end, and a third end, with the first end of the duplexer electrically connected to the antenna.

[0007] The first switching unit includes a first terminal, a second terminal, and a common terminal. The common terminal of the first switching unit is electrically connected to the first terminal of the duplexer.

[0008] The second switching unit includes a first terminal, a second terminal, a third terminal, and a common terminal. The common terminal of the second switching unit is electrically connected to the second terminal of the duplexer, and the third terminal is grounded.

[0009] The radio frequency chip includes a receiver for a first signal channel, a transmitter for a first signal channel, a receiver for a second signal channel, and a transmitter for a second signal channel. The receiver for the first signal channel is electrically connected to a first end of a first switching unit, the transmitter for the first signal channel is electrically connected to a second end of the first switching unit, the receiver for the second signal channel is electrically connected to a first end of a second switching unit, and the transmitter for the second signal channel is electrically connected to a second end of the second switching unit.

[0010] Preferably, the third terminal of the second switching unit is grounded through a capacitor and a resistor connected in series.

[0011] Preferably, the control unit is electrically connected to the control terminal of the first switching unit and the control terminal of the second switching unit.

[0012] Preferably, when the antenna transmits and receives signals through the second signal channel and the first signal channel does not transmit or receive signals, the control unit controls the common terminal of the first switching unit to switch to the first terminal of the first switching unit.

[0013] Preferably, when the antenna transmits a signal through the first signal channel and the second signal channel does not transmit or receive signals, the control unit controls the common terminal of the second switching unit to switch to the third terminal of the second switching unit.

[0014] Preferably, the first switching unit is a single-pole double-throw switch;

[0015] The second switching unit is a single-pole three-throw switch.

[0016] In view of this, the present invention also provides a mobile terminal, characterized in that it includes the above-mentioned anti-crosstalk circuit.

[0017] Compared with the prior art, the anti-crosstalk circuit provided by the embodiments of the present invention controls the on / off state of the first switching unit and the second switching unit according to the current working signal channel, increases the isolation between signal channels, effectively reduces the crosstalk signal strength, and improves the user experience. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a module of one embodiment of the anti-crosstalk circuit of the present invention.

[0019] Figure 2 This is a circuit diagram of one embodiment of the anti-crosstalk circuit of the present invention.

[0020] Explanation of main component symbols

[0021] Mobile terminal 1

[0022] Antenna 100, 100a

[0023] duplexers 101, 101a

[0024] First switching units 102, 102a

[0025] Second switching units 103, 103a

[0026] RF chips 104, 104a

[0027] Control Unit 105a

[0028] First capacitor C1

[0029] First resistor R1

[0030] Control terminals VC1~VC4

[0031] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0032] See Figure 1 As shown, Figure 1This is a schematic diagram of one embodiment of the anti-crosstalk circuit 10 of the present invention. In this embodiment, the anti-crosstalk circuit 10 is applied to a mobile terminal 1. The mobile terminal 1 can be, but is not limited to, electronic devices such as laptops and tablets.

[0033] In this embodiment, the anti-crosstalk circuit 10 includes an antenna 100, a duplexer 101, a first switching unit 102, a second switching unit 103, and an RF chip 104. The antenna 100 is used to receive and transmit signals. The duplexer 101 includes a first end, a second end, and a third end, with the first end of the duplexer 101 electrically connected to the antenna 100. The first switching unit 102 includes a first terminal, a second terminal, and a common terminal. The common terminal of the first switching unit 102 is electrically connected to the first terminal of the duplexer 101. The second switching unit 103 includes a first terminal, a second terminal, a third terminal, and a common terminal. The common terminal of the second switching unit 103 is electrically connected to the second terminal of the duplexer 101, and the third terminal of the second switching unit 103 is grounded. The radio frequency chip 104 includes a receiver of a first signal channel, a transmitter of a first signal channel, a receiver of a second signal channel, and a transmitter of a second signal channel. The receiver of the first signal channel 104 is electrically connected to the first terminal of the first switching unit 102, the transmitter of the first signal channel is electrically connected to the second terminal of the first switching unit 102, the receiver of the second signal channel is electrically connected to the first terminal of the second switching unit 103, and the transmitter of the second signal channel is electrically connected to the second terminal of the second switching unit 103. When antenna 100 transmits and receives signals through the second signal channel, and the first signal channel does not transmit or receive signals, the common terminal of the first switching unit 102 is connected to the first terminal of the first switching unit 102, thereby ensuring the normal operation of the second signal channel. When antenna 100 transmits signals through the first signal channel, and the second signal channel does not transmit or receive signals, the common terminal of the second switching unit 103 is switched to the third terminal of the second switching unit 103, and the third terminal of the second switching unit 103 is grounded, thereby increasing the isolation between the first signal channel and the second communication channel and effectively reducing the crosstalk signal strength.

[0034] See Figure 2 As shown, Figure 2 This is a schematic diagram of another embodiment of the anti-crosstalk circuit of the present invention. In this embodiment, the anti-crosstalk circuit 10a is applied in a mobile terminal 1. The mobile terminal 1 can be, but is not limited to, electronic devices such as laptops and tablets.

[0035] In this embodiment, the anti-crosstalk circuit 10a includes an antenna 100a, a duplexer 101a, a first switching unit 102a, a second switching unit 103a, an RF chip 104a, and a control unit 105a. In this embodiment, the working principles of the antenna 100a, duplexer 101a, first switching unit 102a, second switching unit 103a, and RF chip 104a are similar to those of the antenna 100a, duplexer 101a, first switching unit 102a, second switching unit 103a, and RF chip 104a in the above embodiments, and will not be described again here.

[0036] In this embodiment, the first switching unit 102a is a single-pole double-throw switch, including a first terminal, a second terminal, a common terminal, a control terminal VC1, and a control terminal VC2. The second switching unit 103a is a single-pole triple-throw switch, including a first terminal, a second terminal, a third terminal, a common terminal, a control terminal VC3, and a control terminal VC4. The control unit 105a is electrically connected to the control terminals of the first and second switching units and is used to output logic control signals to control the on / off state of the first and second switching units 102a and 103a. In a specific embodiment of the present invention, when the control unit 105a outputs a high level 1 to the control terminal VC1 and a low level 0 to the control terminal VC2, the common terminal of the first switching unit 102a is switched to the second terminal; when the control unit 105a outputs a high level 0 to the control terminal VC1 and a low level 1 to the control terminal VC2, the common terminal of the first switching unit 102a is switched to the first terminal. When control unit 105a outputs a high level (0) to control terminal VC3 and a low level (0) to control terminal VC4, the common terminal of the second switching unit 102a is switched to the first terminal; when control unit 105a outputs a high level (0) to control terminal VC3 and a low level (0) to control terminal VC4, the common terminal of the second switching unit 102a is switched to the first terminal; when control unit 105a outputs a high level (0) to control terminal VC3 and a low level (1) to control terminal VC4, the common terminal of the second switching unit 102a is switched to the second terminal; when control unit 105a outputs a high level (1) to control terminal VC3 and a low level (0) to control terminal VC4, the common terminal of the second switching unit 102a is switched to the third terminal. The third terminal of the second switching unit 103a is grounded through a first capacitor C1 and a first resistor R1 connected in series.

[0037] In this embodiment, when the antenna 100 transmits and receives signals through the second signal channel and the first signal channel does not transmit or receive signals, the control unit 105a controls the common terminal of the first switching unit 102a to switch to the first terminal of the first switching unit 102a, thereby ensuring the normal operation of the second signal channel. When the antenna 100 transmits signals through the first signal channel and the second signal channel does not transmit or receive signals, the control unit 105a controls the common terminal of the second switching unit 103a to switch to the third terminal of the second switching unit 103a. The third terminal of the second switching unit 103a is grounded, and the signal of the first signal channel and its harmonic signals are isolated by the second switching unit 103a through path1 & path2. The crosstalk signal superimposed on the harmonic signal of the first signal channel signal at the duplexer 101 through the second switching unit 103a is greatly attenuated, thereby effectively reducing the crosstalk signal strength.

[0038] Compared with the prior art, the anti-crosstalk circuit provided by the embodiments of the present invention controls the on / off state of the first switching unit and the second switching unit according to the current working signal channel, increases the isolation between signal channels, effectively reduces the crosstalk signal strength, and improves the user experience.

[0039] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any appropriate changes and modifications made to the above embodiments within the essential spirit and scope of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A crosstalk prevention circuit, characterized in that, include: Antennas are used to receive and transmit signals; A duplexer includes a first end, a second end, and a third end, wherein the first end of the duplexer is electrically connected to the antenna. The first switching unit includes a first terminal, a second terminal, and a common terminal, wherein the common terminal of the first switching unit is electrically connected to the first terminal of the duplexer; The second switching unit includes a first terminal, a second terminal, a third terminal, and a common terminal. The common terminal of the second switching unit is electrically connected to the second terminal of the duplexer, and the third terminal of the second switching unit is grounded. The radio frequency chip includes a receiver of a first signal channel, a transmitter of the first signal channel, a receiver of a second signal channel, and a transmitter of the second signal channel. The receiver of the first signal channel is electrically connected to a first end of the first switching unit, the transmitter of the first signal channel is electrically connected to a second end of the first switching unit, the receiver of the second signal channel is electrically connected to a first end of the second switching unit, and the transmitter of the second signal channel is electrically connected to a second end of the second switching unit. When the antenna transmits a signal through the first signal channel and the second signal channel does not transmit or receive signals, the common terminal of the second switching unit is connected to the third terminal of the second switching unit, so that the crosstalk signal superimposed on the frequency harmonic signal of the first signal channel signal through the second switching unit to the duplexer is attenuated.

2. The anti-crosstalk circuit as described in claim 1, characterized in that, The third terminal of the second switching unit is grounded through a capacitor and a resistor connected in series.

3. The anti-crosstalk circuit as described in claim 1, characterized in that, The control unit is electrically connected to the control terminal of the first switching unit and the control terminal of the second switching unit.

4. The anti-crosstalk circuit as described in claim 3, characterized in that: When the antenna transmits and receives signals through the second signal channel and the first signal channel does not transmit or receive signals, the control unit controls the common terminal of the first switching unit to switch to the first terminal of the first switching unit.

5. The anti-crosstalk circuit as described in claim 3, characterized in that: When the antenna transmits a signal through the first signal channel and the second signal channel does not transmit or receive signals, the control unit controls the common terminal of the second switching unit to switch to the third terminal of the second switching unit.

6. The anti-crosstalk circuit as described in claim 4, characterized in that... : The first switching unit is a single-pole double-throw switch; The second switching unit is a single-pole three-throw switch.

7. A mobile terminal, characterized in that, Including the anti-crosstalk circuit as described in any one of claims 1 to 6.

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