TWM636401U - Power detection device for communication equipment - Google Patents

Abstract

A power detection device of communication equipment is coupled with a power amplification device. The power detection device includes a direct current conduction matching module, a power detection module, and a filter module. The DC conduction matching module includes a first end electrically connected to the power amplifying device, a second end connected to the first end in DC, and a third end connected to the second end in DC. The power detection module is electrically connected with the DC conductive matching module, and includes a plurality of first diodes connected in series with the second terminal, and at least one first diode connected in series with the third terminal. Two diodes, the second diode is grounded, the filter module is connected to the plurality of first diodes, and includes a grounded decoupling capacitor.

Description

Power detection device for communication equipment

The present invention relates to a power detection device, in particular to a power detection device for wireless communication equipment.

The so-called power detector is a circuit that converts the radio frequency signal into a DC voltage, and the magnitude of the DC voltage is proportional to the radio frequency signal. For example, the power detector can output a DC voltage signal whose voltage level is proportional to the input signal, so the power detector can be used to detect the highest peak or all peaks of the input signal.

Power detectors are often used to monitor the output of power amplifiers, and power detectors usually use automatic gain control for gain adjustment in amplifiers. A power detector for this purpose monitors the signal output by the amplifier and displays the amplifier's power level. The power level indication is used to adjust the gain of the amplifier accordingly. This control helps minimize the effects of undesirable variations in the amplifier's output signal level.

Where power detector circuits are particularly useful is in the field of radio communications. For example, power detectors can be used in Code Division Multiple Access (CDMA) wireless telephone systems to ensure that maximum transmit power requirements are not exceeded. During transmission, the power detector converts the output power of the transmitting power amplifier into a DC voltage, which is used by other circuits to determine and/or adjust the transmitting power.

Refer to Fig. 1, which is the invention patent No. 546835 of the Republic of China "Integrated Power Detector with Temperature Compensation". Detector circuit, a block diagram showing the construction of the power amplifier 11 and the power detector 12 of the detector circuit in FIG. 1 . Wherein, a source signal S10 is input to the power amplifier 11, a detection circuit 121 receives the output signal S20 of the power amplifier 11, and outputs a detection signal S110, a reference circuit 122 outputs a reference signal S120, detects and refers to the two signals S110, S120 is input to a compensation circuit 123 .

In this example, the power detector 12 is made up of many individual circuit components, including resistors, capacitors, inductors, and operational amplifiers. A large number of discrete components would require increased system assembly costs and prevent the use of the power detector 12 where space is limited. Furthermore, since the power detector 12 has a large number of discrete components, the required operating current is large and the power consumption is also high.

In addition to the disclosed amplifier and detector circuits, there are also other power detectors 12 that are DC-isolated from the power amplifier in order to reduce the operating current, but this leads to a complex overall circuit and increased cost. Not ideal.

As mentioned above, the conventional power detector 12 requires a large number of discrete components on the circuit board, thus increasing the system cost. At the same time, the required operating current is large and the power consumption is high, which requires complicated calibration and increases the system cost. For these reasons, the power detection circuit used in wireless communication equipment does have room for improvement.

In view of this, the purpose of the present invention is to provide a power detection device for communication equipment.

The power detection device is coupled with a power amplification device, and the power detection circuit device includes a direct current conduction matching module, a power detection module, and a filter module.

The DC conduction matching module includes a first terminal electrically connected to the power amplifying device, a second terminal connected to the first terminal in DC, and a third terminal connected to the second terminal in DC.

The power detection module is electrically connected to the DC conductive matching module, and includes a plurality of first diodes connected to the second end, and a plurality of second diodes connected to the third end, the The polarity of at least one of the plurality of second diodes is reversed, and the second diode is grounded. The impedance of the DC conduction matching module is relative to the DC bias voltage of the power amplifier, and its DC The magnitude of the bias voltage is proportional to the radio frequency signal of the communication equipment.

The filter module is connected with the plurality of first diodes, and includes a grounded decoupling capacitor.

Yet another technical means of the present invention is that the above-mentioned first diode and the second diode are selected from PN diodes, Zener diodes, FET diodes, and Schottky diodes. bodies, and combinations of these diodes.

Another technical means of the present invention lies in that the above-mentioned plurality of first diode structures are sequentially connected in series with each of the first diodes in the polarity series connection of positive and negative poles.

Another technical means of the present invention lies in that the above-mentioned second diode structure is connected in series with the third terminal in a polarity series connection mode of negative pole and positive pole.

Yet another technical means of the present invention lies in that the first end of the above-mentioned DC conduction matching module has a first resistor, and the third end has a third resistor.

Another technical means of the present invention lies in that the first terminal of the above-mentioned direct current conduction matching module has a first resistor, the second terminal has a second resistor, and the third terminal has a third resistor.

The beneficial effect of the present invention is that the diode can be forward biased, so the goal of high efficiency and high power can be achieved without complex circuit structure, and because it meets the requirements of modern electronic components, it can be light, thin and short. A power detector and a power amplifier are formed on a single integrated circuit, and different numbers of diodes are used in series to achieve the purpose of noise separation, so it can be more effective Detect the RF power and reduce the required operating current, so that the current becomes smaller and the power consumption is reduced.

The features and technical contents of the relevant patent applications of the present invention will be clearly presented in the following detailed descriptions of two preferred embodiments with reference to the drawings. Before proceeding with the detailed description, it should be noted that similar elements are denoted by the same reference numerals.

Referring to Fig. 2, it is the first preferred embodiment of the power detection device of the new communication equipment, the power detection device 3 is coupled with a power amplification device 2, and includes a DC conduction matching module 31, A power detection module 32 and a filter module 33 .

The DC conducting matching module 31 is electrically connected to the power amplifying device 2, and includes a first end 311 connected in series with the power amplifying device 2, a second end 312 conducting DC with the first end 311, And a third terminal 313 connected with the second terminal 312 in direct current.

Wherein, the first terminal 311 has a first resistor 314 , and the third terminal 313 has a third resistor 316 . The impedance of the DC conducting matching module 31 is relative to the DC bias voltage of the power amplifying device 2, and the magnitude of the DC bias voltage is proportional to the radio frequency signal of the communication equipment.

The power detection module 32 is electrically connected to the DC conductive matching module 31, and includes a plurality of first diodes 321 connected to the second end 312, and at least one connected to the third end 313 and grounded. The second diode 322. In the first preferred embodiment, the number of the first diode 321 is five, and the number of the second diode 322 is one.

The filter module 33 is connected to the plurality of first diodes 321 and includes a grounded decoupling capacitor 331 . Wherein, the decoupling capacitor 331 is mainly used to eliminate self-excitation so that the power amplifying device 2 can work stably.

The first diode 321 and the second diode 322 are selected from PN diodes, Zener diodes, FET diodes, Schottky diodes, and combinations of these diodes . In the first preferred embodiment, the first diode 321 and the second diode 322 are PN diodes, the number of the first diode 321 is plural, and the plurality of first two The structure of the pole body 321 is to connect each of the first diodes 321 in series in the form of a PN positive pole and a negative pole. The structure of the second diode 322 is connected in series with the third terminal 313 in the polarity series connection mode of NP negative pole and positive pole.

The power detection device 3 of the present invention is DC-coupled with the power amplification device 2. The bias circuit of the power amplification device 2 provides a voltage source, and the bias power detection of the voltage makes the diode improve the detection efficiency. In addition, the circuit of the present invention uses a plurality of first diodes 321 connected in series, so that the required operating current can be effectively reduced, so the goal of high efficiency and high power can be achieved without complicated circuit structure.

Furthermore, the power detection device 3 of the present invention can greatly improve the shortcoming of too high operating current by connecting the plurality of first diodes 321 in series. The more the number of the plurality of first diodes 321 is connected in series, the more The smaller the passing current, the smaller the power consumption.

Referring to Fig. 3, it is the second preferred embodiment of the power detection device of the new type of communication equipment, the second preferred embodiment is roughly the same as the first preferred embodiment, the same will not be repeated here, the different The DC conduction matching module 31 further includes a second resistor 315 connected in series between the first resistor 314 and the plurality of first diodes 321, and the power detection module 32 includes three first Two diodes 322, and the polarity of at least one second diode 322 in the plurality of second diodes 322 is reversed.

Among the plurality of second diodes 322, at least one second diode 322 is reversed in polarity. Two ohmic junctions and one wire will be added to a transistor by reversed connection of two diodes, but the ohmic junction will be A strong potential barrier is formed to affect the movement of electrons, thereby further reducing the power consumption of the overall power detection device 3 .

In the second preferred embodiment, because the plurality of first diodes 321 not only do not need an additional driving current source, but also do not need a complicated circuit structure, the goals of high efficiency and high power can be achieved, and the Significantly improve the shortcoming of high operating current. Furthermore, at least one second diode 322 in the plurality of second diodes 322 is reversed in polarity to form a strong potential barrier to affect the movement of electrons, and the coupling voltage on the diodes can be effectively limited. Therefore, the second preferred embodiment of the power detection device of the new type of communication equipment can further achieve the power saving effect based on the different conduction paths of the DC conduction matching module 31 and utilize the characteristics of PN diodes.

Referring to Figure 4, it is a schematic diagram of the detection voltage-power waveform obtained by the applicant after actually implementing the new circuit and testing it. Among them, the vertical axis is the detection voltage and its unit is mV, and the horizontal axis is the power value and its unit is dBm (decibel relative to one milliwatt). From the results shown in Figure 4, it can be seen that the power detection device of the new type of communication equipment not only has the aforementioned effect of reducing the operating current, but also the detected voltage-power relationship curve is smooth, and the proportional relationship between the two is clear, so for power, The voltage detection result is also more accurate.

To sum up, the power detection device of this new type of communication equipment, according to the different conduction paths of the DC conduction matching module 31, utilizes the small forward impedance and forward bias characteristics of the diode, and uses different numbers of Diodes are connected in series, and the filter voltage stabilization function of the filter module 33 can be used to achieve the purpose of noise separation of the overall power detection device 3, and because the coupling voltage on the diodes is effectively limited, Therefore, it can effectively detect the radio frequency power and reduce the required operating current, so that the current becomes smaller and the power consumption is reduced. In addition, the new type uses the difference in the way of connecting diodes in series to make the overall circuit structure simpler and does not require Complicated discrete components meet the requirements of modern electronic components in light, thin and short sizes, and can form power detectors and power amplifiers on a single integrated circuit, thereby effectively reducing costs, so the purpose of the present invention can indeed be achieved.

But the above are only two preferred embodiments of the present invention, and the scope of implementation of the present invention cannot be limited with this, that is, all simple equivalent changes and changes made according to the patent scope of the present application and the new description content. Modifications all still belong to the scope covered by the patent for this model.

S10: Source signal S20: output signal S110: Detection signal S120: Reference signal 11: Power amplifier 12: Power detector 121: Detection circuit 122: Reference circuit 123: Compensation circuit 2: Power amplifier 3: Power detection device 31: DC conducting matching module 311: first end 312: second end 313: third end 314: the first resistance 315: second resistor 316: the third resistor 32: Power detection module 321: the first diode 322: second diode 33:Filter module 331: decoupling capacitor

Fig. 1 is a schematic diagram of a circuit, illustrating an integrated power detector with temperature compensation known in Taiwan No. 183664; Fig. 2 is a schematic circuit diagram illustrating the first preferred embodiment of the power detection device of the new communication equipment; Fig. 3 is a schematic circuit diagram illustrating the second preferred embodiment of the power detection device of the new communication equipment; and FIG. 4 is a schematic diagram of a detection voltage-power waveform, illustrating the actual detection results of the new power detection module used in communication equipment.

2: Power amplifier

3: Power detection device

31: DC conducting matching module

311: first end

312: second end

313: third end

314: the first resistance

315: second resistor

316: the third resistor

32: Power detection module

321: the first diode

322: second diode

33:Filter module

331: decoupling capacitor

Claims (6)

A power detection device of communication equipment is coupled with a power amplification device, and the power detection device of communication equipment includes: A DC conducting matching module, including a first terminal electrically connected to the power amplifier device, a second terminal conducting DC conducting with the first terminal, and a third terminal conducting DC conducting with the second terminal; a power detection module, electrically connected to the DC conduction matching module, and including a plurality of first diodes connected to the second end, and a plurality of second diodes connected to the third end, The polarity of at least one of the plurality of second diodes is reversed, the second diode is grounded, the impedance of the DC conductive matching module is relative to the DC bias voltage of the power amplifying device, and its The magnitude of the DC bias voltage is proportional to the radio frequency signal of the communication equipment; and A filtering module is connected with the plurality of first diodes and includes a grounded decoupling capacitor. The power detection device of communication equipment as claimed in item 1, wherein the first diode and the second diode are selected from PN diodes, Zener diodes, FET diodes, Xiao Tetradiodes, and combinations of such diodes. The power detection device for communication equipment as described in Claim 2, wherein the plurality of first diode structures are sequentially connected in series with each of the first diodes in a positive and negative polarity manner. The power detection device for communication equipment as claimed in claim 3, wherein the second diode structure is connected in series with the third terminal in a negative pole and positive pole polarity series connection. The power detection device for communication equipment as described in Claim 4, wherein the first end of the DC conduction matching module has a first resistor, and the third end has a third resistor. The power detection device for communication equipment as described in claim 4, wherein the first end of the DC conductive matching module has a first resistor, the second end has a second resistor, and the third end has a first resistor Three resistors.

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