CN204013405U - Tunable high-efficiency power amplifier supporting multiple frequency bands - Google Patents

Abstract

The utility model discloses a tunable high-efficiency power amplifier supporting multiple frequency bands, comprising a tunable input matching network, an E-class power amplification stage circuit, a tunable output matching network, a bias circuit and a stabilizing network, wherein: the tunable input matching The network, class E power amplifier circuit and tunable output matching network are connected in sequence, and the radio frequency signal is transmitted to the class E power amplifier circuit through the tunable input matching network, and then output through the tunable output matching network; the bias circuit and the class E The power amplifier stage circuit is connected, and the bias circuit provides DC bias for the class E power amplifier stage circuit; the stabilizing network is connected between the output of the tunable input matching network and the input of the class E power amplifier stage circuit, and the stabilizing network makes the class E power The amplifier circuit works in an absolutely stable state. The radio frequency power amplifier of the utility model simultaneously realizes the goals of supporting multi-band adjustable and having high working efficiency.

Description

A Tunable High Efficiency Power Amplifier Supporting Multiple Frequency Bands

technical field

The utility model relates to a power amplifier, in particular to a tuneable high-efficiency power amplifier suitable for long-term evolution (Long Term Evolution, LTE) and supporting multiple frequency bands.

Background technique

Due to its high transmission rate, low system delay and optimized wireless transmission technology for data packets, LTE occupies a dominant position in the next generation of mobile communications. On the afternoon of December 4, 2013, the Ministry of Industry and Information Technology officially issued 4G licenses to the three major operators. China China Mobile, China Telecom and China Unicom have all obtained TD-LTE licenses, which also marks China's entry into the 4G era. However, the LTE frequency bands selected by different regions in the world are different from each other. For example, North America chooses 700/800 and 1700/1900MHz, Europe uses 800/1800/2600MHz, and Asia chooses to use 2400/2600MHz frequency band. In this way, different frequency bands in different regions may cause a terminal used in a certain region to be unusable in another region. Therefore, it is necessary to use a terminal device that supports multiple frequency bands.

As the core component of wireless communication equipment, the RF power amplifier is located at the end of the transmitter and is an important front-end component of the terminal RF equipment. At present, the main way to realize traditional power amplifiers with multiple frequency bands is to integrate multiple radio frequency power amplifiers supporting different frequency bands. However, this implementation method has the problems of large area, complex circuit structure, high power consumption and high cost.

Many traditional wireless devices are inefficient and cause a lot of waste of resources. Therefore, how to improve the efficiency of the communication system, reduce operating costs and energy consumption, and improve the economic benefits of the communication industry has become a hot research topic.

How to simultaneously implement a radio frequency power amplifier that supports multi-band tunability and has high working efficiency has become a problem worthy of research in the industry.

Utility model content

(1) Technical problems to be solved

The technical problem to be solved by the utility model is to provide a tunable high-efficiency power amplifier that supports multiple frequency bands, so as to simultaneously realize a radio frequency power amplifier that supports multiple frequency bands and has high working efficiency.

(2) Technical solution

In order to achieve the above purpose, the utility model provides a tunable high-efficiency power amplifier supporting multiple frequency bands. The tunable high-efficiency power amplifier includes a tunable input matching network, a class E power amplifier circuit, a tunable output matching network and a circuit and a stabilizing network, wherein: the tunable input matching network, the class E power amplifier circuit and the tunable output matching network are sequentially connected, and the radio frequency signal is transmitted to the class E through the tunable input matching network The power amplifier stage circuit is output through the tunable output matching network; the bias circuit is connected with the class E power amplifier stage circuit, and the bias circuit provides a DC bias for the class E power amplifier stage circuit The stabilizing network is connected between the output of the tunable input matching network and the input of the class E power amplifier circuit, and the stabilizing network makes the class E power amplifier circuit work in an absolutely stable state.

In the above solution, the tunable input matching network includes: first to third DC blocking capacitors (C1, C2, C3), seventh to eighth input adjustable matching capacitors (C7, C8), first to third choke inductance (L1, L2, L3) and the fourth input matching inductance L4, wherein: one end of the first DC blocking capacitor C1 is used as a signal input end, and the other end is sequentially passed through the seventh input adjustable matching capacitor C7, the second blocking capacitor C7 The DC capacitor C2, the fourth input matching inductor L4, and the third DC blocking capacitor C3 are connected to the class E power amplifier circuit; one end of the third choke inductor L3 is grounded, and the other end is connected to the first DC blocking capacitor C1 and the seventh input adjustable matching capacitor C7; one end of the first choke inductor L1 is biased, and the other end is connected between the seventh input adjustable matching capacitor C7 and the second DC blocking capacitor C2; the first One end of the second choke inductor L2 is biased, and the other end is connected between the second DC blocking capacitor C2 and the fourth input matching inductor L4; one end of the eighth input adjustable matching capacitor C8 is grounded, and the other end is connected to the second blocking capacitor C8. between the direct capacitor C2 and the fourth input matching inductor L4.

In the above solution, the stabilization network adopts an RLC network, including the first resistor R1, the fifth inductor L5 and the tenth capacitor C10 connected in series in sequence, wherein one end of the first resistor R1 is connected to the third DC blocking capacitor C3 and Between the class E power amplifier circuits, the other end is connected to the fifth inductor L5; one end of the tenth capacitor C10 is connected to the fifth inductor L5, and the other end is grounded.

In the above solution, the Class E power amplifier stage circuit adopts a Class E circuit topology, including transistors, fourth and fifth DC blocking capacitors (C4, C5), sixth to eighth choke inductors (L6, L7, L8 ), variable steering capacitor Cd, variable tuning capacitor C and tuning inductance Lx, wherein: the gate terminal of the transistor is used as a signal input, the source terminal is grounded, and the drain terminal passes through the fourth DC blocking capacitor C4 and the fifth DC blocking capacitor successively C5 and the variable tuning capacitor C are connected to the tuning inductor Lx; one end of the variable steering capacitor Cd is connected between the fourth DC blocking capacitor C4 and the fifth DC blocking capacitor C5, and the other end is grounded; the sixth choke inductor One end of L6 is connected between the fourth DC blocking capacitor C4 and the fifth DC blocking capacitor C5, and the other end is connected to a DC bias; one end of the seventh choke inductor L7 is connected to the fifth DC blocking capacitor C5 and the variable tuning capacitor C The other end is connected to a DC bias; one end of the eighth choke inductor L8 is connected between the variable tuning capacitor C and the tuning inductor Lx, and the other end is grounded.

In the above solution, the tunable output matching network includes a sixth DC blocking capacitor C6, a tenth choke inductor L10, a ninth variable output matching capacitor C9, and a ninth output matching inductor L9, wherein: the sixth DC blocking The capacitor C6 is connected to the ninth output matching inductor L9, and the other end of the ninth output matching inductor L9 is connected to the output end of the tunable high-efficiency power amplifier; one end of the tenth choke inductor L10 is connected to the sixth DC blocking capacitor C6 Between the ninth output matching inductor L9 and the other end is connected with a DC bias; one end of the ninth variable output matching capacitor C9 is connected between the sixth DC blocking capacitor C6 and the ninth output matching inductor L9, and the other end is grounded.

(3) Beneficial effects

The tunable high-efficiency power amplifier supporting multiple frequency bands provided by the utility model adopts the method of combining a class E power amplifier with a reconfigurable or tunable circuit network, and the class E power amplifier can provide high working efficiency and can be re- The structure or tunable circuit network can tune the circuit, so that the whole network can work in different frequency bands. Combining the class E power amplifier with the reconfigurable or tunable circuit network, it has high working efficiency and adjustable multi-working frequency bands. Features, and at the same time realize a radio frequency power amplifier with simple circuit structure, multi-band adjustable, and high working efficiency.

Description of drawings

Fig. 1 is a schematic diagram of a tunable high-efficiency power amplifier supporting multiple frequency bands provided by the utility model.

FIG. 2 is a circuit diagram of a tunable input matching network in the tunable high-efficiency power amplifier shown in FIG. 1 .

FIG. 3 is a circuit diagram of the stabilization network in the tunable high-efficiency power amplifier shown in FIG. 1 .

FIG. 4 is a circuit diagram of a class-E power amplifier stage circuit in the tunable high-efficiency power amplifier shown in FIG. 1 .

FIG. 5 is a circuit diagram of a tunable output matching network in the tunable high-efficiency power amplifier shown in FIG. 1 .

Detailed ways

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

As shown in Figures 1 to 5, the embodiment of the present invention provides a tunable high-efficiency power amplifier that supports multiple frequency bands. The tunable high-efficiency power amplifier includes a tunable input matching network, a class E power amplifier circuit, Output matching network, bias circuit and stabilization network, wherein: tunable input matching network, class E power amplifier stage circuit and tunable output matching network are connected sequentially, and the radio frequency signal is transmitted to class E power amplifier stage circuit through the tunable input matching network , and then output through the tunable output matching network; the bias circuit is connected to the class E power amplifier circuit, and the bias circuit provides DC bias to the class E power amplifier circuit; the stabilization network is connected to the output of the tunable input matching network and Between the inputs of the class E power amplifier circuit, the stabilizing network makes the class E power amplifier circuit work in an absolutely stable state.

As shown in Figure 2, the tunable input matching network includes: first to third DC blocking capacitors (C1, C2, C3), seventh to eighth input adjustable matching capacitors (C7, C8), first to third Choke inductors (L1, L2, L3) and the fourth input matching inductor L4, wherein: one end of the first DC blocking capacitor C1 is used as the signal input end, and the other end passes through the seventh input adjustable matching capacitor C7, the second DC blocking capacitor C2, the fourth input matching inductor L4, the third DC blocking capacitor C3 are connected to the class E power amplifier circuit; one end of the third choke inductor L3 is grounded, and the other end is connected to the first DC blocking capacitor C1 and the seventh input adjustable Between the matching capacitor C7; one end of the first choke inductor L1 is connected to the bias, and the other end is connected between the seventh input adjustable matching capacitor C7 and the second DC blocking capacitor C2; one end of the second choke inductor L2 is connected to the bias, The other end is connected between the second DC blocking capacitor C2 and the fourth input matching inductor L4; one end of the eighth input adjustable matching capacitor C8 is grounded, and the other end is connected between the second DC blocking capacitor C2 and the fourth input matching inductor L4 .

As shown in Figure 3, the stabilization network adopts an RLC network, including a first resistor R1, a fifth inductor L5 and a tenth capacitor C10 connected in series in sequence, wherein one end of the first resistor R1 is connected to the third DC blocking capacitor Between C3 and the class-E power amplifier circuit, the other end is connected to the fifth inductor L5; one end of the tenth capacitor C10 is connected to the fifth inductor L5, and the other end is grounded.

As shown in Figure 4, the Class E power amplifier circuit adopts a Class E circuit topology, including transistors, fourth and fifth DC blocking capacitors (C4, C5), sixth to eighth choke inductors (L6, L7, L8 ), variable steering capacitor Cd, variable tuning capacitor C and tuning inductance Lx, wherein: the gate terminal of the transistor is used as a signal input, the source terminal is grounded, and the drain terminal passes through the fourth DC blocking capacitor C4, the fifth DC blocking capacitor C5 and The variable tuning capacitor C is connected to the tuning inductor Lx; one end of the variable steering capacitor Cd is connected between the fourth DC blocking capacitor C4 and the fifth DC blocking capacitor C5, and the other end is grounded; one end of the sixth choke inductor L6 is connected to the fourth Between the DC blocking capacitor C4 and the fifth DC blocking capacitor C5, the other end is connected to the DC bias; one end of the seventh choke inductor L7 is connected between the fifth DC blocking capacitor C5 and the variable tuning capacitor C, and the other end is connected to the DC bias One end of the eighth choke inductor L8 is connected between the variable tuning capacitor C and the tuning inductor Lx, and the other end is grounded.

As shown in Figure 5, the tunable output matching network includes a sixth DC blocking capacitor C6, a tenth choke inductor L10, a ninth variable output matching capacitor C9, and a ninth output matching inductor L9, wherein: the sixth DC blocking capacitor C6 It is connected to the ninth output matching inductor L9, and the other end of the ninth output matching inductor L9 is connected to the output end of the tunable high-efficiency power amplifier; one end of the tenth choke inductor L10 is connected to the sixth DC blocking capacitor C6 and the ninth output matching inductor Between L9, the other end is connected with a DC bias; one end of the ninth variable output matching capacitor C9 is connected between the sixth DC blocking capacitor C6 and the ninth output matching inductor L9, and the other end is grounded.

The tunable high-efficiency power amplifier supporting multiple frequency bands provided by the utility model has the following working principles:

As shown in Figure 4, the bias circuit provides a DC bias for the transistor, making the transistor work in a class E switching state. Change the size of the variable steering capacitor Cd by controlling DCbias3; change the size of the variable tuning capacitor C by controlling DCbias4, so that the tuning capacitor and tuning inductance can resonate in different frequency bands, so that the power amplifier of the utility model can work in different frequency bands .

Referring to Figure 2 and Figure 5, by changing the bias DCbias1, DCbias2, DCbias5 to control the capacitance of the seventh to ninth variable output matching capacitors (C7, C8, C9) to adjust the tunable input matching network and tunable output matching network. The input matching network adopts a conjugate matching method to obtain sufficient power gain. The output matching network adopts the best load impedance to get the best output power.

The utility model has the following advantages:

1. The tunable high-efficiency power amplifier supporting multiple frequency bands provided by the utility model can control the variable capacitance in the tunable input matching network, power amplification stage, and tunable output matching network to achieve switching between different frequency bands by changing the bias voltage Effect.

2. The tunable high-efficiency power amplifier supporting multiple frequency bands provided by the utility model adopts the class E power amplifier structure, so the power amplifier of the utility model has very high working efficiency.

3. The tunable high-efficiency power amplifier supporting multiple frequency bands provided by the utility model has a simple circuit structure and is easy to realize.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present utility model in detail. It should be understood that the above descriptions are only specific embodiments of the present utility model and are not intended to limit the present invention. For the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims (5)

1. support the tunable high efficiency power amplifier of multiband for one kind, it is characterized in that, this is tunable, and high efficiency power amplifier comprises tunable input matching network, E class power amplification grade circuit, tunable output matching network, biasing circuit and stabilizing network, wherein:

Described tunable input matching network, described E class power amplification grade circuit are connected successively with described tunable output matching network, radiofrequency signal is sent to described E class power amplification grade circuit through described tunable input matching network, then exports through described tunable output matching network;

Described biasing circuit is connected with described E class power amplification grade circuit, and described biasing circuit provides direct current biasing to described E class power amplification grade circuit;

Described stabilizing network is connected between the output of described tunable input matching network and the input of described E class power amplification grade circuit, and described stabilizing network makes described E class power amplification grade circuit be operated in absolute stability state.

2. the tunable high efficiency power amplifier of support multiband according to claim 1, it is characterized in that, described tunable input matching network comprises: the first to the 3rd capacitance (C1, C2, C3), the 7th to the 8th adjustable matching capacitance of input (C7, C8), the first to the 3rd choke induction (L1, L2, L3) and the 4th Input matching inductance (L4), wherein:

Described the first capacitance (C1) one end is as signal input part, and the other end is connected with described E class power amplification grade circuit by the adjustable matching capacitance of the 7th input (C7), the second capacitance (C2), the 4th Input matching inductance (L4), the 3rd capacitance (C3) successively;

Described the 3rd choke induction (L3) one end ground connection, the other end is connected between the first capacitance (C1) and the 7th adjustable matching capacitance of input (C7);

Described the first choke induction (L1) termination biasing, the other end is connected between the 7th adjustable matching capacitance of input (C7) and the second capacitance (C2);

Described the second choke induction (L2) termination biasing, the other end is connected between the second capacitance (C2) and the 4th Input matching inductance (L4);

Described the 8th input adjustable matching capacitance (C8) one end ground connection, the other end is connected between the second capacitance (C2) and the 4th Input matching inductance (L4).

3. support according to claim 2 the tunable high efficiency power amplifier of multiband, it is characterized in that, described stabilizing network adopts RLC network, comprise the first resistance (R1), the 5th inductance (L5) and the tenth electric capacity (C10) that are connected in series successively, wherein, described the first resistance (R1) one end is connected between the 3rd capacitance (C3) and described E class power amplification grade circuit, and the other end is connected in the 5th inductance (L5); The tenth electric capacity (C10) one end is connected in the 5th inductance (L5), other end ground connection.

4. support according to claim 1 the tunable high efficiency power amplifier of multiband, it is characterized in that, described E class power amplification grade circuit adopts E class circuit topological structure, comprise transistor, the 4th and the 5th capacitance (C4, C5), the 6th to the 8th choke induction (L6, L7, L8), variable steering electric capacity (Cd), variable tuning electric capacity (C) and tuning coil (Lx), wherein:

Described transistorized grid end is inputted as signal, source ground connection, and drain terminal is connected in tuning coil (Lx) by the 4th capacitance (C4), the 5th capacitance (C5) and variable tuning electric capacity (C) successively;

Described variable steering electric capacity (Cd) one end is connected between the 4th capacitance (C4) and the 5th capacitance (C5), other end ground connection;

Described the 6th choke induction (L6) one end is connected between the 4th capacitance (C4) and the 5th capacitance (C5), another termination direct current biasing;

Described the 7th choke induction (L7) one end is connected between the 5th capacitance (C5) and variable tuning electric capacity (C), another termination direct current biasing;

Described the 8th choke induction (L8) one end is connected between variable tuning electric capacity (C) and tuning coil (Lx), other end ground connection.

5. support according to claim 1 the tunable high efficiency power amplifier of multiband, it is characterized in that, described tunable output matching network comprises the 6th capacitance (C6), the tenth choke induction (L10), the 9th variable output matching electric capacity (C9) and the 9th output matching inductance (L9), wherein:

Described the 6th capacitance (C6) is connected with the 9th output matching inductance (L9), the output of described the 9th another this tunable high efficiency power amplifier of termination of output matching inductance (L9);

Described the tenth choke induction (L10) one end is connected between the 6th capacitance (C6) and the 9th output matching inductance (L9), another termination direct current biasing;

Described the 9th variable output matching electric capacity (C9) one end is connected between the 6th capacitance (C6) and the 9th output matching inductance (L9), other end ground connection.