WO2017166216A1

WO2017166216A1 - Circuit capable of extending dynamic range of radio-frequency output power of 5.8 ghz frequency band

Info

Publication number: WO2017166216A1
Application number: PCT/CN2016/078171
Authority: WO
Inventors: 邬晓斌; 吴兆春; 周宗仪
Original assignee: 宽兆科技(深圳)有限公司
Priority date: 2016-03-31
Filing date: 2016-03-31
Publication date: 2017-10-05

Abstract

A circuit capable of extending a dynamic range of the radio-frequency output power of a 5.8 GHz frequency band, the circuit comprising a radio-frequency chip, a plurality of stages of radio-frequency power amplifiers (G1,..., Gn) and a radio-frequency output unit which are connected in sequence. The radio-frequency chip is used for outputting a radio-frequency signal of a 5.8 GHz frequency band. The plurality of stages of radio-frequency power amplifiers (G1,..., Gn) are used for performing gradual amplification processing on the radio-frequency signal of the 5.8 GHz frequency band. Short circuit switches (S1,..., Si) are connected in parallel to two ends of at least one stage of radio-frequency power amplifier of the plurality of stages of radio-frequency power amplifiers (G1,..., Gn). When the short circuit switches (S1,..., Si) are closed, corresponding radio-frequency power amplifiers (G1,..., Gn) can be short-circuited. States of the short circuit switches (S1,..., Si) depend on a power level of the radio-frequency signal of the 5.8 GHz frequency band. The radio-frequency output unit is used for outputting the amplified radio-frequency signal of the 5.8 GHz frequency band. The circuit extends a dynamic range of output power.

Description

Circuit that can extend the dynamic range of RF output power in the 5.8 GHz band

Technical field

The invention belongs to the field of power amplifiers in a mobile communication network, and particularly relates to a circuit capable of expanding the dynamic range of the RF output power in the 5.8 GHz band.

Background technique

Since there are not many RF applications in the 5.8 GHz band, applications in this band are less interfered by other applications in the same frequency band and have higher reliability. However, there are not many devices that can be selected in the product design of this frequency band. The performance of devices in this band often cannot meet the requirements of different wireless technology standards such as WIFI, WIMAX, LTE, etc. One of the most important points is the RF of the devices in this band. The dynamic range of the output power does not meet the requirements of the standard. The solution to be solved in other common frequency bands is to use gain attenuation (Gain). Step) Functional RF Amplifier (English: Radio Frequency Power Amplifier (PA), but PAs currently used in the 5.8GHz band generally do not have this feature.

technical problem

The technical problem to be solved by the present invention is to provide a circuit capable of expanding the dynamic range of the RF output power in the 5.8 GHz band, aiming at realizing the RF gain attenuation function and increasing the output power dynamics of the circuit based on the existing optional RF device. range.

Technical solution

The present invention provides a circuit for extending the dynamic range of the RF output power in the 5.8 GHz band, the circuit comprising a sequentially connected RF chip, a plurality of stages of RF power amplifiers, and an RF output unit;

The radio frequency chip is used to output a radio frequency signal in a 5.8 GHz band;

The plurality of stages of radio frequency power amplifiers are configured to perform step-by-step amplification processing on the RF signals in the 5.8 GHz frequency band; at least one of the plurality of stages of the RF power amplifiers has a short circuit switch connected in parallel at both ends thereof, when the short circuit is When the switch is closed, the corresponding RF power amplifier can be short-circuited, and the state of the short-circuit switch depends on the power level of the RF signal in the 5.8 GHz band;

The radio frequency output unit is configured to output an RF signal of the 5.8 GHz band after the amplification process.

Further, the plurality of stages of radio frequency power amplifiers include a primary RF power amplifier and a secondary RF power amplifier; the primary RF power amplifier has a power gain of G1 and the short circuit switch is connected in parallel; the secondary RF power amplifier The power gain is G2;

The short-circuiting switch is used to close the RF signal of the 5.8 GHz band in which the RF chip output power is reduced to the lowest power, and is used before the RF signal of the 5.8 GHz band in which the RF chip output power is increased to the highest power. disconnect.

Beneficial effect

Compared with the prior art, the present invention has the beneficial effects that the present invention provides a circuit for extending the dynamic range of the RF output power in the 5.8 GHz band, and implementing the 5.8 GHz RF gain attenuation function based on the existing optional device. The dynamic range of the output power of the circuit is expanded; it can better meet the requirements of different wireless technology standards such as WIFI, WIMAX, LTE, and can better utilize the spectrum resources of 5.8 GHz.

DRAWINGS

1 is a circuit diagram of a dynamic range of a radio frequency output power in a scalable 5.8 GHz band according to an embodiment of the present invention;

2 is a circuit diagram of two RF power amplifiers provided by an embodiment of the present invention.

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The main implementation idea of the present invention is that a plurality of RF power amplifiers are connected between the RF chip and the RF output unit, and at least one of the plurality of RF power amplifiers has a short circuit switch connected in parallel with both ends of the RF power amplifier. Before the output power of the RF chip is reduced to the lowest power PinL, close at least one short-circuit switch to make the corresponding RF power amplifier not work; before the output power of the RF chip increases to the highest power PinH, disconnect the short-circuit switch to make the corresponding RF Power amplifier operation; expands the dynamic range of the output power of the entire circuit.

The following is a detailed description of the circuit for extending the dynamic range of the RF output power in the 5.8 GHz band, as shown in Figure 1:

The circuit includes a radio frequency chip connected in sequence, a plurality of stages of radio frequency power amplifiers, and a radio frequency output unit;

The radio frequency chip is used for outputting a radio frequency signal in a 5.8 GHz band, and the power of the radio frequency signal is represented as Pin;

The plurality of stages of radio frequency power amplifiers are used for step-by-step amplification processing of the radio frequency signals in the 5.8 GHz band; the plurality of stages of radio frequency power amplifiers are sequentially represented as PA1, ..., PAn, and their powers are sequentially expressed as G1, ... , Gn; at least one of the plurality of stages of the RF power amplifier has a short-circuit switch S connected at both ends of the first-stage RF power amplifier (specifically, S1, S2, ..., Si; wherein, i=1, 2...n), When the short-circuiting switch S is closed, the corresponding radio frequency power amplifier can be short-circuited, and the state of the short-circuiting switch S depends on the power level of the radio frequency signal of the 5.8 GHz band.

Specifically, before the output power of the radio frequency chip is reduced to the lowest power PinL, the short circuit switch is closed; before the output power of the radio frequency chip is increased to the highest power PinH, the short circuit switch is turned off; The closed state is controlled by internal software.

The radio frequency output unit is configured to output an RF signal of the 5.8 GHz frequency band after the amplification process, and the power of the radio frequency signal is represented as Pout.

The following is a specific embodiment to introduce the circuit of the dynamic range of the RF output power in the 5.8 GHz band, as shown in Figure 2:

The circuit includes a radio frequency chip, a primary RF power amplifier PA1, a secondary RF power amplifier PA2, a radio frequency output unit, and a short circuit switch S;

The primary radio frequency power amplifier PA1 is connected to the radio frequency chip for receiving power input by the radio frequency chip, and amplifying the output power of the power; the output power of the radio frequency chip is Pin, and the power gain of the primary radio frequency power amplifier PA1 For G1.

The secondary RF power amplifier PA2 is connected to the primary RF power amplifier PA1 for receiving the power input by the primary RF power amplifier PA1 and amplifying the output power of the power; the power of the secondary RF power amplifier PA2 The gain is G2.

The radio frequency output unit is connected to the secondary radio frequency power amplifier PA2 for outputting an amplified RF signal of the 5.8 GHz frequency band, which is represented as Pout. The shorting switch S is connected to both ends of the primary RF power amplifier PA1;

Before the RF chip output power is reduced to the lowest power PinL, the short-circuit switch is closed and the primary RF power amplifier PA1 does not operate. Before the output power of the RF chip increases to the highest power PinH, the short-circuit switch is turned off and the primary RF power amplifier PA1 operates.

The output power dynamic range of the entire circuit is expanded.

Since the RF application in the 5.8 GHz band is relatively small, the application in this band is less interfered by other applications in the same frequency band, and the reliability is high, but the dynamic range of the output power is often insufficient. The present invention designs a set of 5.8 GHz RF Gain based on existing optional components. The circuit of the Step function, applying the short-circuit switch, expands the dynamic range of the output power of the circuit, so that it can better meet the requirements of different wireless technology standards such as WIFI, WIMAX, LTE, and can better utilize the spectrum resources of 5.8 GHz. .

The circuit provided by the invention can be applied in all kinds of radio equipments which are used in the 5.8 GHz frequency band and the application of the existing devices cannot meet the dynamic range of the output power.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

A circuit capable of expanding a dynamic range of a radio frequency output power of a 5.8 GHz band, wherein the circuit comprises a serially connected radio frequency chip, a plurality of stages of radio frequency power amplifiers, and a radio frequency output unit;

The radio frequency chip is used to output a radio frequency signal in a 5.8 GHz band;

The plurality of stages of radio frequency power amplifiers are configured to perform step-by-step amplification processing on the RF signals in the 5.8 GHz frequency band; at least one of the plurality of stages of the RF power amplifiers has a short circuit switch connected in parallel at both ends thereof, when the short circuit is When the switch is closed, the corresponding RF power amplifier can be short-circuited, and the state of the short-circuit switch depends on the power level of the RF signal in the 5.8 GHz band;

The radio frequency output unit is configured to output an RF signal of the 5.8 GHz band after the amplification process.
The RF output circuit of claim 1 wherein said plurality of stages of RF power amplifiers comprise a primary RF power amplifier and a secondary RF power amplifier; said primary RF power amplifier having a power gain of G1 and having both ends connected in parallel The short circuit switch; the power gain of the secondary RF power amplifier is G2;

The short-circuiting switch is used to close the RF signal of the 5.8 GHz band in which the RF chip output power is reduced to the lowest power, and is used before the RF signal of the 5.8 GHz band in which the RF chip output power is increased to the highest power. disconnect.