TWM637353U - Power harmonic reduction device - Google Patents

Abstract

A power harmonic reduction device, suitable for receiving a radio frequency output of a communication system, which includes a connection terminal, a first capacitor, a radio frequency impedance matching module, a diode group, a second capacitor, a resistor, a The transmission group, and a third capacitor, the power harmonic reduction device uses a circuit containing diodes to achieve the purpose of reducing harmonics, and its effect on reducing multiplied harmonics is better than using traditional harmonic reduction circuits. The attenuation of double frequency harmonics can even be lower than -80dBc.

Description

Power harmonic reduction device

This model relates to a new harmonic reduction (harmonics) circuit, which is used in communication system circuits that need to reduce harmonics. For the harmonics of radio frequency signals, it has a better harmonic reduction effect than the traditional one. In addition, the radio frequency integrated circuit Circuits, microwave integrated circuits, communication system circuits, etc., can all be used.

There are many conventional harmonic reduction circuits, but the design principle of harmonic reduction in the conventional harmonic reduction circuits can be illustrated by FIG. 1 and FIG. 2 .

The traditional harmonic reduction circuit uses filter technology, and there are many types of filters, such as Butterworth, Chebyshev, etc.

With reference to Fig. 1, illustrate a kind of traditional harmonic reduction circuit that uses filter, comprise a transistor 21, an impedance matching circuit 22, a filter 23, and a radio frequency power output port 24, wherein, this transistor 21 is power The last stage of the amplifier.

The filter 23 of the harmonic reduction circuit consists of circuit elements, many of which are passive circuit elements: resistors, capacitors, and inductors. There are also a small number of filter components that use a combination of active and passive circuit components. Whether it is a filter using all passive circuit components, or a filter using a mixture of active and passive circuit components, the characteristics of using a filter as a harmonic reduction circuit are: when the filter is to be applied to a communication system circuit, the filter It must be inserted in the output circuit path of the radio frequency signal, so that it will have the effect of reducing harmonics.

The filter 23 is arranged between the impedance matching circuit 22 and the RF power output port 24. In addition, the filter 23 can also be arranged between the impedance matching circuit 22 and the transistor 21, or between the impedance matching circuit 22 and the transistor 21. within the matching circuit 22.

No matter what kind of filter it is, or where it is placed in the impedance matching circuit, the characteristic of using a filter as a harmonic reduction circuit is that the filter must be inserted in the output circuit path of the radio frequency signal to achieve effective reduction The effect of harmonics. Another feature of the filter is: the principle of reducing harmonics is to reflect the harmonics back to the emission source, and prevent the harmonics from passing through the filter circuit.

Referring to Fig. 2, another kind of conventional harmonic reduction circuit is illustrated, comprising a transistor 31, an impedance matching circuit 32, a radio frequency power output port 33, an inductance 34, and a capacitor 35, and the transistor 31 is a power amplifier In the last stage, the inductance 34 is connected in series with the capacitor 35 and then grounded. The harmonic reduction circuit is achieved by a resonant circuit in which the inductance 34 and the capacitor 35 are connected in series, which can reflect the harmonics back to the emission source without letting the harmonics By reducing harmonic circuits.

Of course, a resonant circuit in which multiple sets of inductors and capacitors are connected in series may also be used. The harmonic reduction circuit can also be regarded as the above-mentioned filter, but the slight difference from the filter is that the filter usually has an input port and an output port, and this conventional harmonic reduction resonant circuit only needs a single point and a radio frequency signal The path of the output circuit is connected.

In view of this, the purpose of the present invention is to provide a power harmonic reduction device.

The power harmonic reduction device is suitable for receiving the radio frequency output of a communication system.

The power harmonic reduction device includes a connection terminal, a first capacitor, a radio frequency impedance matching module, a diode group, a second capacitor, a resistor, a transmission group, and a third capacitor.

The connection end is connected with the communication system. The first capacitor is connected to the connecting end. The radio frequency impedance matching module is connected with the first capacitor. The diode group is composed of at least one diode, and the anode of the diode group is connected with the radio frequency impedance matching module. One end of the second capacitor is grounded, and the other end of the second capacitor is connected to the cathode of the diode group. One end of the resistor is grounded, and the other end of the resistor is connected to the cathode of the diode group. The transmission group is connected to the cathode of the diode group. One end of the third capacitor is grounded, and the other end of the third capacitor is connected to the transmission group.

The connection terminal, the first capacitor, the RF impedance matching module, the diode group, the transmission group and the third capacitor are connected in series, and the second capacitor and the resistor are connected in parallel.

Another technical means of the present invention is that the above-mentioned resistance is connected in parallel with the third capacitor.

Another technical means of the present invention is that the above-mentioned power harmonic reduction device further includes a DC voltage source, and the DC voltage source is connected in parallel with the third capacitor.

The beneficial effect of the present invention is that the power harmonic reduction device adopts absorbing to absorb most of the harmonic energy to the diode group.

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

Please refer to Fig. 3, it is a first preferred embodiment of a kind of power harmonic reduction device of the present invention, and this power harmonic reduction device 44 is suitable for receiving the radio frequency output of a communication system, and this communication system comprises an amplifier 41, a and The impedance matching circuit 42 that this amplifier 41 is connected, and a radio frequency output power port 43 that is connected with this impedance matching circuit 42, wherein, Fig. 3 shows that this amplifier 41 is the transistor of last stage, and this power harmonic reduction device 44 simultaneously The amplifier 41 and the impedance matching circuit 42 are connected.

Referring to Fig. 4, the power harmonic reduction device 44 includes a connection terminal 441, a first capacitor 442, a radio frequency impedance matching module 443, a diode group 444, a second capacitor 445, a resistor 446, a transmission group 447, and a third capacitor 448.

The connection end 441 is connected to the communication system, the first capacitor 442 is connected to the connection end 441, the radio frequency impedance matching module 443 is connected to the first capacitor 442, and the diode group 444 is composed of at least one diode , the anode of the diode set 444 is connected to the radio frequency impedance matching module 443, one end of the second capacitor 445 is grounded, the other end of the second capacitor 445 is connected to the cathode of the diode set 444, and the resistor 446 One end is grounded, the other end of the resistor 446 is connected to the cathode of the diode group 444, the transmission group 447 is connected to the cathode of the diode group 444, the electronic components of the transmission group 447 are inductors or wires, the first One end of the third capacitor 448 is grounded, and the other end of the third capacitor 448 is connected to the transmission group 447 .

The connecting terminal 441, the first capacitor 442, the RF impedance matching module 443, the diode group 444, the transmission group 447 and the third capacitor 448 are connected in series, and the second capacitor 445 and the resistor 446 are In parallel connection, the resistor 446 has the function of providing a direct current path to ground.

In the first preferred embodiment, the main purpose of the first capacitor 442 is to isolate direct current (DC), and the main purpose of the second capacitor 445 is to provide low impedance close to a short circuit (short), as the diode Impedance matching of the group 444, and improve the radio frequency energy that the radio frequency signal transmits to the diode group 444, the function of the radio frequency impedance matching module 443 is to match the impedance of the diode group 444 and the radio frequency signal output circuit, the resistor 446 . The transmission group 447 and the third capacitor 448 cooperate to have the function of absorbing radio frequency harmonics.

Based on the frequency of the main frequency of the radio frequency signal, it is necessary to design the first capacitor 442 and the radio frequency impedance matching module 443 so that it can be coupled with a small amount of radio frequency signal of the communication system circuit, and it is also necessary to design the second capacitor 445 to make it It can provide a short-circuit (short) low impedance at the main frequency and multiplier frequency of the radio frequency signal. In addition, the resistor 446 needs to be set with a high resistance value, which is used to provide the DC path (DC path) of the diode group 444 , will not affect the radio frequency impedance value of the harmonic reduction circuit, the design of the transmission group 447 and the third capacitor 448 can make the radio frequency impedance value of the harmonic reduction circuit compatible with the communication system circuit at the main and multiplier frequencies of the radio frequency signal RF impedance matching.

In general harmonic reduction circuits, most of the harmonic reduction functions can only reach -60dBc. The harmonic reduction circuit made of low temperature ceramic sintering (LTCC) can reach -70dBc due to the low Tangent Loss of the material. As mentioned above, general materials, or on general circuit boards; such as FR4, BT... and other harmonic reduction circuits made of passive circuit components, due to the Tangent Loss of its materials or circuit boards, even if it uses multi-level Most of the filter's harmonic reduction function can only reach -60dBc.

However, the new power harmonic reduction device 44 is not limited by the Tangent Loss factor of the material, whether it is applied to integrated circuit design or designed on a general circuit board, it can reach or exceed the effect of -70dBc.

Referring to Fig. 5, it is a second preferred embodiment of a new type of power harmonic reduction device, the second preferred embodiment is roughly the same as the first preferred embodiment, the same is no longer described in detail here, different The difference is that the resistor 446 of the power harmonic reduction device 44 is connected to the third capacitor 448 and the transmission group 447, the resistor 446 is connected in parallel with the third capacitor 448, and the resistor 446 has the function of providing a DC ground path .

Referring to Fig. 6, it is a third preferred embodiment of a new type of power harmonic reduction device. The difference is that the power harmonic reduction device 44 further includes a DC voltage source 449 connected in parallel with the third capacitor 448. The main purpose of the DC voltage source 449 is to change the radio frequency impedance of the diode group 444 at the multiplier frequency. In order to make the diode group 444 more capable of absorbing radio frequency harmonics, the power harmonic reduction device 44 can achieve an effect exceeding -80dBc.

Referring to Fig. 7, it is a fourth preferred embodiment of a new type of power harmonic reduction device, the fourth preferred embodiment is roughly the same as the third preferred embodiment, the same will not be described in detail here, different The difference is that the resistor 446 of the power harmonic reduction device 44 is connected to the third capacitor 448, the transmission group 447 is connected to the DC voltage source 449, and the resistor 446 is connected to the third capacitor 448 and the DC voltage source 449. In parallel connection, the resistor 446 has the function of providing a direct current path to ground.

To sum up, the power harmonic reduction device 44 of the present invention uses a diode group 444 instead of being purely composed of passive circuit elements. (absorbing), most of the harmonic energy is absorbed into the diode group 444, so the purpose of the present invention can indeed be achieved.

But what is described above is only a preferred embodiment of the present invention, and should not limit the scope of implementation of the present invention with this, that is, all simple equivalent changes and modifications made according to the patent scope of the present application and the content of the new description , all still belong to the scope covered by the present patent.

21: Transistor 22: Impedance matching circuit 23: filter 24: RF power output port 31: Transistor 32: Impedance matching circuit 33: RF power output port 34: Inductance 35: capacitance 41: Amplifier 42: Impedance matching circuit 43: RF output power port 44: Power harmonic reduction device 441: connection end 442: the first capacitor 443: RF Impedance Matching Module 444: diode group 445: second capacitor 446: resistance 447: Transmission group 448: The third capacitor 449: DC voltage source

Fig. 1 is a circuit schematic diagram of a conventional harmonic reduction circuit using a filter; Fig. 2 is a circuit schematic diagram of a conventional harmonic reduction circuit using a resonant circuit of inductance and capacitance; Fig. 3 is a kind of circuit schematic diagram of the communication system that uses the novel power harmonic reduction device; Fig. 4 is a first preferred embodiment of the present invention, illustrating a circuit diagram of a power harmonic reduction device; Fig. 5 is a second preferred embodiment of the present invention, illustrating a circuit diagram of a power harmonic reduction device; Fig. 6 is a third preferred embodiment of the present invention, illustrating a schematic circuit diagram of a power harmonic reduction device; and Fig. 7 is a fourth preferred embodiment of the present invention, illustrating a schematic circuit diagram of a power harmonic reduction device.

441: connection end

442: the first capacitor

443: RF Impedance Matching Module

444: diode group

445: second capacitor

446: resistance

447: Transmission group

448: The third capacitor

Claims (8)

A power harmonic reduction device suitable for receiving a radio frequency output of a communication system, comprising: a connection terminal, connected to the communication system; a first capacitor connected to the connecting terminal; A radio frequency impedance matching module, connected to the first capacitor; a diode group consisting of at least one diode, the anode of the diode group is connected to the radio frequency impedance matching module; A second capacitor, one end of the second capacitor is grounded, and the other end of the second capacitor is connected to the cathode of the diode group; A resistor, one end of the resistor is grounded, and the other end of the resistor is connected to the cathode of the diode group; a transmission set connected to the cathode of the diode set; and a third capacitor, one end of the third capacitor is grounded, and the other end of the third capacitor is connected to the transmission group; Wherein, the connection terminal, the first capacitor, the radio frequency impedance matching module, the diode group, the transmission group and the third capacitor are connected in series, and the second capacitor and the resistor are connected in parallel. The power harmonic reduction device according to claim 1, wherein the electronic components of the transmission group are inductors or wires. A power harmonic reduction device suitable for receiving a radio frequency output of a communication system, comprising: a connection terminal, connected to the communication system; a first capacitor connected to the connecting terminal; A radio frequency impedance matching module, connected to the first capacitor; a diode group consisting of at least one diode, the anode of the diode group is connected to the radio frequency impedance matching module; A second capacitor, one end of the second capacitor is grounded, and the other end of the second capacitor is connected to the cathode of the diode group; a transmission group connected to the cathode of the diode group; a third capacitor, one end of the third capacitor is grounded, and the other end of the third capacitor is connected to the transmission group; and A resistor, one end of the resistor is grounded, and the other end of the resistor is connected to the transmission group; Wherein, the connection terminal, the first capacitor, the RF impedance matching module, the diode group, the transmission group and the third capacitor are connected in series, and the third capacitor and the resistor are connected in parallel. The power harmonic reduction device according to claim 3, wherein the electronic components of the transmission group are inductors or wires. A power harmonic reduction device suitable for receiving a radio frequency output of a communication system, comprising: a connection terminal, connected to the communication system; a first capacitor connected to the connecting terminal; A radio frequency impedance matching module, connected to the first capacitor; a diode group consisting of at least one diode, the anode of the diode group is connected to the radio frequency impedance matching module; A second capacitor, one end of the second capacitor is grounded, and the other end of the second capacitor is connected to the cathode of the diode group; A resistor, one end of the resistor is grounded, and the other end of the resistor is connected to the cathode of the diode group; a transmission group connected to the cathode of the diode group; a third capacitor, one end of the third capacitor is grounded, and the other end of the third capacitor is connected to the transmission group; a DC voltage source, the negative pole of the DC voltage source is grounded, and the positive pole of the DC voltage source is connected to the transmission group; Wherein, the connection terminal, the first capacitor, the radio frequency impedance matching module, the diode group, the transmission group and the third capacitor are connected in series, the second capacitor and the resistor are connected in parallel, and the third capacitor It is connected in parallel with the DC voltage source. The power harmonic reduction device according to claim 5, wherein the electronic components of the transmission group are inductors or wires. A power harmonic reduction device suitable for receiving a radio frequency output of a communication system, comprising: a connection terminal, connected to the communication system; a first capacitor connected to the connecting terminal; A radio frequency impedance matching module, connected to the first capacitor; a diode group consisting of at least one diode, the anode of the diode group is connected to the radio frequency impedance matching module; A second capacitor, one end of the second capacitor is grounded, and the other end of the second capacitor is connected to the cathode of the diode group; a transmission group connected to the cathode of the diode group; a third capacitor, one end of the third capacitor is grounded, and the other end of the third capacitor is connected to the transmission group; A resistor, one end of the resistor is grounded, and the other end of the resistor is connected to the transmission group; a DC voltage source, the negative pole of the DC voltage source is grounded, and the positive pole of the DC voltage source is connected to the transmission group; Wherein, the connection terminal, the first capacitor, the radio frequency impedance matching module, the diode group, the transmission group and the third capacitor are connected in series, and the third capacitor, the resistor and the DC voltage source are connected in parallel . The power harmonic reduction device according to claim 7, wherein the electronic components of the transmission group are inductors or wires.

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