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A reinforced isolation circuit

An isolation and circuit technology, applied in the field of wireless communication, to suppress loop distortion, improve isolation, and shorten turn-off delay time

Active Publication Date: 2017-06-06
USI ELECTRONICS SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems existing in the prior art, the present invention provides a circuit that enhances the isolation of the Tx / Rx switching section, which can greatly shorten the voltage drop time of the switching circuit. At the same time, the circuit with enhanced isolation also provides a protection mechanism to avoid The transmitting link and the receiving link work simultaneously, which completely solves the problem of loop distortion

Method used

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  • A reinforced isolation circuit
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Examples

Experimental program
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Effect test

Embodiment 1

[0036] Such as image 3 As shown, the power supply circuit 10 of the enhanced isolation circuit is a p-MOS, its source is connected to the power supply VDD, the discharge circuit 20 is an n-MOS, its source is grounded, and the drain of the p-MOS is the voltage output of the discharge circuit 10 Terminal V out , which is connected to the drain of the n-MOS.

[0037] The inverter circuit 30 is an inverter 31 , and the Tx / Rx control signal Tx / Rx Enable Signal is respectively connected to the gates of the p-MOS and n-MOS through the inverter 31 .

[0038]The inverter 31 inverts the Tx / Rx control signal Tx / Rx Enable Signal, that is, inverts the high potential into a low potential to control whether the p-MOS and n-MOS are enabled or not. When the Tx / Rx control signal Tx / Rx Enable Signal is at a high potential, the potential is reversed to a low potential through the inverter 31. At this time, the p-MOS channel is turned on, and the output voltage terminal V of the power supply ci...

Embodiment 2

[0043] Such as Figure 4 As shown, the power supply circuit 10 of the enhanced isolation circuit is a pnp-BJT, its emitter is connected to the power supply VDD, the discharge circuit 20 is an npn-BJT, its emitter is grounded, and the collector of the pnp-BJT is the voltage of the discharge circuit 10 Output V out , which is connected to the collector of the npn-BJT.

[0044] The inverter circuit 30 is an inverter 31 , and the Tx / Rx control signal Tx / Rx Enable Signal is respectively connected to the bases of the pnp-BJT and the npn-BJT through the inverter 31 .

[0045] In Embodiment 2, the p-MOS and n-MOS in Embodiment 1 are replaced by pnp-BJT and npn-BJT respectively, which can also achieve the effect of shortening the discharge time. Since the start-up of p-MOS and n-MOS must first charge the gate oxide layer to reverse the polarity of the channel, there will be a voltage delay time t D , no voltage delay time t if npn-BJT is used D , ie t D =0. Of course, in order to...

Embodiment 3

[0047] Such as Figure 5 As shown, the power supply circuit 10 of the enhanced isolation circuit is a low dropout regulator (Low Drop-Outregulator, LDO), the discharge circuit 20 is an n-MOS, its source is grounded, and its drain is connected to the voltage output of the power supply circuit 10 Terminal V out connected. The Tx / Rx control signal Tx / Rx Enable Signal is connected to the low dropout voltage regulator LDO to control whether the low dropout voltage regulator LDO supplies power. At the same time, the Tx / Rx control signal Tx / Rx Enable Signal passes through an inverter 31 and n - the gates of the MOS are connected to control whether the discharge circuit 20 discharges.

[0048] When the Tx / Rx control signal Tx / Rx Enable Signal is at a high voltage level, the low dropout voltage regulator LDO can supply power; when the Tx / Rx control signal Tx / Rx Enable Signal is at a low voltage level, the low dropout voltage regulator The device LDO is powered off, and at this time ...

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Abstract

The present invention discloses a circuit for enhancing isolation of a Tx / Rx switching interval. The circuit comprises a power supplying circuit, a power discharging circuit, a phase inverting circuit and a delay circuit. The circuit in the present invention shortens the delay time for switching off the voltage by discharging the power supplying circuit, improves the isolation and completely suppresses a circuit distortion phenomenon by utilizing a delay protection mechanism to correspondingly delay the output of an output voltage when the powering off is delayed.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a circuit for enhancing the isolation of Tx / Rx switching intervals. Background technique [0002] The WLAN (Wireless Local Area Network, WLAN) transceiver has a half-duplex mechanism, and its working state is switched between receiving Rx and transmitting Tx, but it cannot work in the Rx state and the Tx state at the same time. The Rx state and the Tx state cannot interfere with each other, that is, the Tx link and the Rx link need to be well isolated. [0003] When the existing transceiver operates in the Tx state, it will turn off the low-noise amplifier (Low-Noise Amplifier, LNA) through a control signal, or introduce a switch circuit to power off the low-noise amplifier LNA when it is not working, so as to This improves the isolation of the Tx / Rx link and avoids loop distortion, and vice versa. [0004] However, if the Tx / Rx control signal Tx / Rx Enable Signal is used t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/525
Inventor 林志明郑志彬刘宝元
Owner USI ELECTRONICS SHENZHEN
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