CN216451346U - Differential amplification circuit and radio frequency front end module - Google Patents
Differential amplification circuit and radio frequency front end module Download PDFInfo
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- CN216451346U CN216451346U CN202122411434.9U CN202122411434U CN216451346U CN 216451346 U CN216451346 U CN 216451346U CN 202122411434 U CN202122411434 U CN 202122411434U CN 216451346 U CN216451346 U CN 216451346U
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Abstract
The application discloses a differential amplification circuit and a radio frequency front end module, and relates to the technical field of electronic circuits. Wherein, differential amplifier circuit includes: the differential amplification unit is connected with the balun unit, the feed power supply end is coupled to the midpoint of the primary coil of the balun unit, one end of the first LC tuning unit is connected with the feed power supply end, the other end of the first LC tuning unit is connected with the ground end, and the feed power supply end is coupled to the midpoint of the primary coil of the balun unit, one end of the first LC tuning unit is connected with the feed power supply end, and the other end of the first LC tuning unit is connected with the ground end.
Description
Technical Field
The application belongs to the technical field of electronic circuits, and particularly relates to a differential amplification circuit and a radio frequency front end module.
Background
Nowadays, with the popularization of the fifth Generation Mobile Communication Technology (5th Generation Mobile Communication Technology, 5G), the frequency band requirement for transmitting and receiving video signals to and from Communication devices such as terminals is increasing. As the bandwidth of the terminal for transmitting and receiving signals increases, the performance requirements on the rf circuit configured on the terminal become more and more strict. For example, a differential amplifier circuit in a radio frequency circuit is required to have better linearity, or have better signal amplification efficiency, etc.
However, in the process of amplifying the differential signal pair, the differential amplifier circuit configured in the existing radio frequency circuit affects the linearity of the whole circuit due to the harmonic signals carried in the differential signal pair. Therefore, the existing differential amplification circuit has the problem of nonlinearity in the process of amplifying the differential signal pair.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a differential amplification circuit and a radio frequency front end module, which aim to solve the problem that the existing differential amplification circuit has nonlinearity in the process of amplifying differential signal pairs.
In a first aspect, an embodiment of the present application provides a differential amplifier circuit, including:
the differential amplification unit is used for amplifying the radio frequency input signal pair to obtain an amplified signal pair and transmitting the amplified signal pair to the balun unit;
the balun unit is connected with the differential amplification unit and used for converting and synthesizing the amplification signal pair and outputting a radio frequency output signal;
a feed power supply terminal coupled to a midpoint of a primary coil of the balun unit;
and the first end of the first LC tuning unit is connected with the power supply end of the feed, the second end of the first LC tuning unit is connected with the ground end, and the first LC tuning unit is used for carrying out harmonic tuning on the amplified signal pair.
In a second aspect, an embodiment of the present application further provides a radio frequency front end module, including the differential amplifier circuit provided in the first aspect.
The embodiment of the application provides a differential amplifier circuit and radio frequency front end module, wherein, a differential amplifier circuit includes: the differential amplification unit is connected with the balun unit, the feeding power supply end is coupled to the midpoint of the primary coil of the balun unit, one end of the first LC tuning unit is connected with the feeding power supply end, the other end of the first LC tuning unit is connected with the ground end, the radio-frequency input signal pair is amplified by the differential amplification unit to obtain an amplified signal pair, the amplified signal pair is transmitted to the balun unit, because the feeding power supply end is coupled to the midpoint of the primary coil of the balun unit, one end of the first LC tuning unit is connected with the feeding power supply end, and the other end of the first LC tuning unit is connected with the ground end, the amplified signal pair can be harmonically tuned by the first LC tuning unit in the process of converting and synthesizing the amplified signal pair through the balun unit and outputting a radio-frequency output signal, and the problem of nonlinearity of the differential amplification circuit in the process of amplifying the differential signal pair is solved, thereby improving the linearity of the differential amplification circuit and improving the signal amplification efficiency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a differential amplifier circuit provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a differential amplifier circuit according to another embodiment of the present application;
fig. 3 is a specific circuit diagram of a differential amplifier circuit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a radio frequency front end module according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a differential amplifier circuit according to an embodiment of the present disclosure. The present embodiment shown in fig. 1 provides a differential amplifier circuit 100, which is applied to a radio frequency circuit. The differential amplification circuit 100 includes: a differential amplification unit 10, a balun unit 20, a feeding power supply terminal 30, and a first LC tuning unit 40. Specifically, the method comprises the following steps:
and the differential amplification unit 10 is configured to amplify the radio frequency input signal pair to obtain an amplified signal pair. And the balun unit 20 is connected with the differential amplification unit 10, and is used for converting and synthesizing the amplified signal pair and outputting a radio frequency output signal. And a feeding power supply terminal 30 coupled to a midpoint of the primary coil of the balun unit 20. A first LC tuning unit 40 having a first terminal connected to the feeding power supply terminal 30 and a second terminal connected to the ground terminal, the first LC tuning unit 40 being configured to perform harmonic tuning on the amplified signal pair.
In the present embodiment, the differential amplification unit 10, as a signal input port of the differential amplification circuit 100, is configured to allow input of a radio frequency input signal pair of different frequency bands. Here, the pair of rf input signals of different frequency bands means that the frequency band of the pair of rf input signals input to the differential amplifying unit 10 at a time may be different. And when the differential amplification unit 10 receives the radio frequency input signal pair, the radio frequency input signal pair is amplified to obtain an amplified signal pair corresponding to the radio frequency input signal pair. When the differential amplification unit 10 is used to amplify the rf input signal pair, the rf input signal pair received by the differential amplification unit 10 is a differential signal pair with the same amplitude and the opposite phase.
In implementation, the differential amplifying unit 10 at least includes two sets of signal amplifying circuits, and the two sets of signal amplifying circuits respectively amplify the radio frequency input signal pair synchronously, so as to obtain an amplified signal pair. Here, since the radio frequency input signal pair is a differential signal pair, that is, two signals with the same amplitude and opposite phases, two sets of signal amplification circuits are used to amplify two signals in the differential signal pair respectively, and the obtained amplified signal pair also belongs to a differential signal pair.
It should be understood that, in particular implementations, the rf input signal pair may be an existing frequency band signal pair, for example, one of a first rf input signal pair of N77 frequency band, a second rf input signal pair of N78 frequency band, and a third rf input signal pair of N79 frequency band; the frequency of the first radio frequency input signal pair is between 3.3GHz and 4.2GHz, the frequency of the second radio frequency input signal pair is between 3.3GHz and 3.8GHz, and the frequency of the third radio frequency input signal pair is between 4.5GHz and 5 GHz.
As shown in fig. 1, the balun unit 20 is connected to the differential amplification unit 10, and therefore the differential amplification unit 10 can transmit the amplified signal pair to the balun unit 20. The balun unit 20 is used to convert and synthesize the amplified signal pair, and output a radio frequency output signal. The feeding power supply terminal 30 is coupled to a midpoint of the primary coil of the balun unit 20. The first LC tuning unit 40 has one end connected to the feed power terminal and the other end connected to the ground terminal, and is configured to perform harmonic tuning on the amplified signal pair.
In all embodiments of the present application, the feeding power supply terminal 30 is coupled to a midpoint of the primary coil of the balun unit 20, and is connected to one end of the first LC tuning unit 40, which is equivalent to the midpoint of the primary coil of the balun unit 20 to which the first LC tuning unit 40 is coupled through the feeding power supply terminal 30. Here, the feeding power supply terminal 30 simultaneously supplies a direct-current voltage to the midpoint of the primary coil of the balun unit 20 and the first LC tuning unit 40, and the primary coil of the balun unit 20 and the first LC tuning unit 40 respond only to an alternating-current signal, that is, only to a radio-frequency input signal and to a resonance signal in a pair with a radio-frequency signal. The first LC tuning unit 40 is therefore capable of, when the balun unit 20 receives an amplified signal pair, coupling with the midpoint of the primary coil of the balun unit 20 via the feeding power supply terminal 30, thereby harmonically tuning the amplified signal pair.
For example, by configuring the resonant frequency point of the first LC tuning unit 40, the first LC tuning unit 40 resonates at the second harmonic frequency point or the third harmonic frequency point, so that the second harmonic signal or the third harmonic signal in the amplified signal pair is shorted to the ground, the purpose of filtering the second harmonic signal or the third harmonic signal in the amplified signal pair is achieved, and the overall linearity and the signal amplification efficiency of the differential amplification circuit 100 are improved.
In one embodiment, the balun unit 20 includes at least one twisted pair balun for transforming and combining the amplified signal pair to output a radio frequency output signal. In practical applications, the balun unit 20 is also equivalent to providing impedance transformation for at least two different lines to achieve impedance matching, and the balun is composed of two or more sets of coils.
As an example, as shown in fig. 1, the balun unit 20 may be configured with a first signal input 21, a second signal input 22 and a feeding end 23. The first signal input terminal 21 and the second signal input terminal 22 of the balun unit 20 may be two ends of a primary coil in the balun unit 20, and the feeding terminal 23 is a middle point of the primary coil in the balun unit 20. The balun unit 20 is connected to the differential amplifying unit 10 via the first signal input terminal 21 and the second signal input terminal 22, and the balun unit 20 is connected to the feeding power terminal 30 via the feeding terminal 23. Here, the feeding power supply terminal 30 may be an extension line of a midpoint of the primary coil provided in the balun unit 20, through which one end of the first LC tuning unit 40 is connected.
It should be noted that, since the feeding power supply terminal 30 is coupled to the midpoint of the primary coil of the balun unit 20, one end of the first LC tuning unit 40 is connected to the feeding power supply terminal 30, and the other end of the first LC tuning unit 40 is connected to the ground terminal, the harmonic signal in the amplified signal pair transferred to the balun unit 20 can be tuned by the first LC tuning unit 40.
It is easy to understand that one end of the first LC tuning unit 40 is connected to the power supply terminal 30, and the other end is connected to the ground terminal and is used for tuning the harmonic signal in the amplified signal, and the differential amplification unit 10 amplifies the radio frequency input signal pair and simultaneously amplifies the originally carried second harmonic signal and/or third harmonic signal, and the amplified signal pair also carries the amplified second harmonic signal and/or amplified third harmonic signal. In view of the above, in the present application, the feeding power terminal 30 is coupled to a midpoint of the primary coil of the balun unit 20, and the first LC tuning unit 40 is connected between the feeding power terminal 30 and the ground terminal, so that the first LC tuning unit 40 can filter the second-order harmonic signal and/or the third-order harmonic signal carried in the amplified signal pair, thereby improving the overall linearity and signal amplification efficiency of the differential amplification circuit 100.
In a specific implementation, the first LC tuning unit 40 may select an existing LC tuning circuit, such as an existing series circuit of an inductor and a capacitor, and connect the LC tuning circuit between the power supply terminal 30 and the ground terminal, so as to short-circuit the second-order harmonic signal and/or the third-order harmonic signal carried in the amplified signal pair to the ground, thereby achieving the purpose of harmonic filtering. It can be understood that, in practical application, the number of the inductors, the number of the capacitors, or the value of the two in the LC tuning circuit can be adjusted according to actual requirements, so as to achieve the purpose that the LC tuning circuit tunes harmonic signals of any order, and make the radio frequency output signal obtained by converting the amplified signal pair by the balun unit 20 approach to an ideal requirement, and therefore, detailed description of a specific circuit for implementing the first LC tuning unit 40 is omitted here.
As an embodiment, the differential amplifying circuit 100 is a class F differential amplifying circuit, and the first LC tuning unit 40 resonates at a second-order resonant frequency point.
Alternatively, the differential amplifier circuit 100 is an inverse class F differential amplifier circuit, and the first LC tuner unit 40 resonates at a third-order resonance frequency point.
In this embodiment, when the differential amplifying circuit 100 is a class F differential amplifying circuit, in order to enable the differential amplifying circuit 100 to better operate in class F and improve the linearity and efficiency of amplifying the radio frequency signal pair, it should be realized that the differential amplifying circuit 100 short-circuits the second-order harmonic signal, that is, the first LC tuning unit 40 resonates at the second-order resonant frequency point, and further the second-order harmonic signal in the amplified signal pair transmitted to the balun unit 20 can be short-circuited to ground. When the differential amplifying circuit 100 is an inverse F-class differential amplifying circuit, in order to enable the differential amplifying circuit 100 to work in the inverse F-class better and improve the linearity and efficiency of amplifying the radio frequency signal pair, it should be realized that the differential amplifying circuit 100 short-circuits the third-order harmonic signal, that is, the first LC tuning unit 40 resonates at the third-order resonant frequency point, and further the third-order harmonic signal in the amplified signal pair transmitted to the balun unit 20 can be short-circuited to the ground.
In actual use, the differential amplifier circuit 100 can operate in different modes, and thus, there is a distinction in categories. For example, a class D differential amplifier circuit, a class F differential amplifier circuit, and an inverse class F differential amplifier circuit. Although the class D differential amplifier circuit, the class F differential amplifier circuit, or the inverse class F differential amplifier circuit all belong to the operating modes of the existing differential amplifier circuit, the harmonic tuning requirements of the differential amplifier circuit in different modes are different, that is, the resonant frequency point of the first LC tuning unit 40 is different, and accordingly, the specific structure or specific circuit devices of the first LC tuning unit 40 are different.
In all embodiments of the present application, the differential amplifying unit 10 and the balun unit 20 in the differential amplifying circuit 100 are connected to form a series resonant circuit, based on which, according to the formula of resonant frequency:
the specific circuit structure and devices of the first LC tuning cell 40 are determined based on the evaluation of the formula at the determined resonance frequency point. Because in the formula of the resonance frequency, f0Is the resonant frequency of the radio frequency signal; l is an inductance value; c is a capacitance value; pi is a known value, so that the inductance value L and the capacitance value C can be obtained by measuring and calculating the resonant frequency requirement, and a corresponding LC tuning circuit is further constructed. Based on this, when the differential amplifying circuit 100 is a class F differential amplifying circuit, the first LC tuning unit 40 resonates at a second-order harmonic frequency point, accordingly, according to the equation
That is, the corresponding inductance value L and the corresponding capacitance value C may be determined, that is, the LC tuning circuit corresponding to the first LC tuning unit 40 may be constructed, so that when the differential amplifier circuit 100 is a class F differential amplifier circuit, the first LC tuning unit 40 resonates at the second-order resonant frequency point 2fo by configuring the inductance value L and the capacitance value C in the first LC tuning unit 40; and further, the purpose of short-circuiting the second-order harmonic signals carried in the amplified signal pair to the ground is achieved. Similarly, when the differential amplifying circuit 100 is an inverse F-type differential amplifying circuit, the first LC tuning unit 40 resonates at a third-order resonance frequency point, and accordingly, according to the equation
The corresponding inductance value L and the corresponding capacitance value C can be determined, and the LC tuning circuit corresponding to the first LC tuning unit 40 can be constructed, so that when the differential amplifier circuit 100 is the inverse F-type differential amplifier circuitAt this time, the first LC tuning unit 40 is made to resonate at the third-order resonant frequency point 3fo by configuring the inductance value L and the capacitance value C in the first LC tuning unit 40; and further, the purpose of short-circuiting the third-order harmonic signals carried in the amplified signal pair to the ground is achieved.
It is easily understood that, in a specific implementation, a person skilled in the art may adjust a device structure or a device specification of the LC circuit in the first LC tuning unit 40 according to different characteristics between the class F differential amplifier circuit and the inverse class F differential amplifier circuit and actual requirements, and further implement that the first LC tuning unit 40 resonates at a second-order resonance frequency point or a third-order resonance frequency point, so that details of the LC circuit in the first LC tuning unit 40 are not described herein again.
The above-mentioned scheme provides a differential amplification circuit, includes: the differential amplification unit is connected with the balun unit, the feeding power supply end is coupled to the midpoint of the primary coil of the balun unit, one end of the first LC tuning unit is connected with the feeding power supply end, the other end of the first LC tuning unit is connected with the ground end, the radio-frequency input signal pair is amplified by the differential amplification unit to obtain an amplified signal pair, the amplified signal pair is transmitted to the balun unit, because the feeding power supply end is coupled to the midpoint of the primary coil of the balun unit, one end of the first LC tuning unit is connected with the feeding power supply end, and the other end of the first LC tuning unit is connected with the ground end, the amplified signal pair can be harmonically tuned by the first LC tuning unit in the process of converting and synthesizing the amplified signal pair through the balun unit and outputting a radio-frequency output signal, and the problem of nonlinearity of the differential amplification circuit in the process of amplifying the differential signal pair is solved, and then improve the linearity of the differential amplifier circuit, raise the signal amplification efficiency.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a differential amplifier circuit according to another embodiment of the present disclosure. Based on the embodiment of fig. 1, a differential amplifier circuit 100 shown in fig. 2 further includes: a second LC tuning element 50. Specifically, the method comprises the following steps:
one end of the second LC tuning unit 50 is connected to the output terminal 24 of the balun unit 20, and the other end of the second LC tuning unit 50 is connected to the ground terminal. The second LC tuning unit 50 is used for harmonic tuning of the radio frequency output signal.
In this embodiment, the second LC tuning unit 50 is connected between the output terminal of the balun unit 20 and the ground terminal, and since the balun unit 20 is configured to perform conversion and synthesis on the amplified signal pair and output a radio frequency output signal, the second LC tuning unit 50 can be configured to perform harmonic tuning on the radio frequency output signal output by the balun unit 20.
It should be noted that, since the balun unit 20 performs conversion and synthesis on the pair of amplified signals, and the output rf output signal also includes a second-order resonance signal and/or a third-order resonance signal, in order to further improve the linearity and the conversion efficiency of the entire differential amplifier circuit 100, a second LC tuning unit 50 may be disposed between the output terminal and the ground terminal of the balun unit 20 for performing harmonic tuning on the rf output signal.
When implemented, the second LC tuning unit 50 may be an LC tuning circuit having the same structure as the first LC tuning unit 40. In addition, since the second LC tuning unit 50 is connected to the output terminal of the balun unit 20, and the first LC tuning unit 40 is connected to the feeding terminal (the midpoint of the primary coil) of the balun unit 20, the first LC tuning unit 40 tunes the input signal to the balun unit 20, and the second LC tuning unit 50 tunes the output signal to the balun unit 20. Therefore, in a specific implementation, although the second LC tuning unit 50 may be an LC tuning circuit having the same structure as the first LC tuning unit 40, the resonant frequency point of the second LC tuning unit 50 is different from the resonant frequency point of the first LC tuning unit 40, and there is a corresponding relationship therebetween. For example, when the first LC tuning unit 40 resonates at the second-order resonance frequency point, the second-order resonance signal in the amplified signal pair is filtered out, and simultaneously, the second LC tuning unit 50 resonates at the third-order resonance frequency point, and the third-order resonance signal in the rf output signal is subjected to open-circuit processing. For another example, when the first LC tuning unit 40 resonates at a third-order resonant frequency point, the third-order resonant signal in the amplified signal pair is filtered, and meanwhile, the second LC tuning unit 50 resonates at a second-order resonant frequency point, so as to perform open-circuit processing on the second-order resonant signal in the radio frequency output signal.
As an embodiment, the differential amplifying circuit is a class F differential amplifying circuit, and the second LC tuning unit resonates at a third-order resonant frequency point; or the differential amplifying circuit is an inverse F-type differential amplifying circuit, and the second LC tuning unit resonates at a second-order resonant frequency point.
In this embodiment, the resonant frequency point of the second LC tuning unit is related to, but not identical to, the resonant frequency point of the first LC tuning unit. Here, taking the differential amplifier circuit as a class F differential amplifier circuit or an inverse class F differential amplifier circuit as an example, when the differential amplifier circuit is a class F differential amplifier circuit, the first LC tuning unit 40 filters the second-order resonance signal of the amplified signal pair when resonating at the second-order resonance frequency point, and the second LC tuning unit 50 resonates at the third-order resonance frequency point to perform an open-circuit process on the third-order resonance signal of the radio frequency output signal. When the differential amplifier circuit is an inverse F-type differential amplifier circuit, the first LC tuning unit 40 filters the third-order resonance signal in the amplified signal pair when resonating at the third-order resonance frequency point, and the second LC tuning unit 50 resonates at the second-order resonance frequency point to perform open-circuit processing on the second-order resonance signal in the radio frequency output signal.
It will be readily appreciated that the second LC tuning unit may employ an LC resonant circuit similar to that of the first LC resonant unit. That is, when the second LC tuning unit resonates at the third-order resonant frequency point, it follows the equation
Determining a corresponding inductance value L and a corresponding capacitance value C, and further constructing a corresponding LC third-order resonance circuit; or when the second LC tuning unit resonates at the second-order resonant frequency point, according to the equation
Corresponding inductance value L and corresponding capacitance value C can be determined, and then a corresponding LC second-order resonance circuit is constructed.
In a specific implementation, the device structure or the device specification of the LC circuit in the second LC tuning unit 50 may be adjusted according to different characteristics between the F-type differential amplifier circuit and the inverse F-type differential amplifier circuit and actual requirements, so that the second LC tuning unit 50 resonates at the second-order resonant frequency point or the third-order resonant frequency point, and therefore the LC circuit in the second LC tuning unit 50 is not described herein again.
Fig. 3 is a specific circuit diagram of a differential amplifier circuit according to an embodiment of the present application. As shown in fig. 3, the differential amplifying unit 10 includes a first amplifying transistor M1 and a second amplifying transistor M2.
The input terminal of the first amplifying transistor M1 and the input terminal of the second amplifying transistor M2 form a signal input terminal of the differential amplifying unit 20, for inputting a radio frequency input signal pair. A first terminal of the first amplifying transistor M1 is connected to a first input terminal of the balun unit 20, a second terminal of the first amplifying transistor M1 is commonly connected to a first terminal of the second amplifying transistor M2, and a second terminal of the second amplifying transistor M2 is connected to a second input terminal of the balun unit 20.
In this embodiment, the input terminal of the first amplifying transistor M1 and the input terminal of the second amplifying transistor M2 commonly receive the rf input signal pair, and amplify the rf input signal pair to obtain an amplified signal pair, and the first terminal of the first amplifying transistor M1 and the second terminal of the second amplifying transistor M2 commonly transmit the amplified signal pair to the balun unit 20.
As an example, the first amplifying transistor is a first BJT transistor, and includes a base, a collector, and an emitter, and the base of the first BJT transistor is used as an input terminal of the first amplifying transistor; the collector of the first BJT transistor is used as the first end of the first amplifying transistor, and the emitter of the first BJT transistor is used as the second end of the first amplifying transistor; the second amplifying transistor is a second BJT transistor and comprises a base electrode, a collector electrode and an emitter electrode, and the base electrode of the second BJT transistor is used as the input end of the second amplifying transistor; the collector of the second BJT transistor is used as the first end of the second amplifying transistor, and the emitter of the second BJT transistor is used as the second end of the second amplifying transistor.
As shown in fig. 3, as a way of implementing the embodiment of the present application, the balun unit 20 includes: primary coil B1 and secondary coil B2.
A first terminal of the primary coil B1 serves as the first signal input terminal 21 of the balun unit 20, a second terminal of the primary coil B1 serves as the second signal input terminal 22 of the balun unit 20, and a midpoint of the primary coil B1 serves as the feeding terminal 23 of the balun unit 20. The feeding power supply terminal VCC is connected to an extension line of the feeding terminal 23. A first terminal of the secondary winding B2 serves as the first signal output terminal 24 of the balun element 20, and a second terminal of the secondary winding B2 serves as the second signal output terminal 25 of the balun element 20.
As shown in fig. 3, as a way of implementing the embodiment of the present application, the first LC tuning circuit 40 includes a first capacitor C1 and a first inductor L1. A first terminal of the first capacitor C1 serves as a first terminal of the first LC tuning circuit 40, a second terminal of the first capacitor C1 is connected to a first terminal of the first inductor L1, and a second terminal of the first inductor L1 is grounded.
In the embodiment, the first capacitor C1 and the first inductor L1 are connected in series between the power supply terminal VCC and the ground terminal, the first capacitor C1 is close to the power supply terminal VCC side, and the first inductor L1 is close to the ground terminal. Since the first inductor L1 is a segment of wound coil, and the length and shape of the inductor can be reasonably set to be equivalent to a transmission wire, an equivalent metal wire can be used as the first inductor L1 in specific implementation.
In a specific implementation, in order to save the actual installation space of the differential amplification single-circuit 100, some devices in the differential amplification circuit 100 may be disposed in a chip according to actual situations, for example, some structures of the differential amplification unit 10 and the first LC tuning unit 40 are disposed in a chip, the feeding power terminal 30 and the balun unit 20 are disposed on a substrate, and then the balun unit 20 and the feeding power terminal 30 on the substrate are connected by a pin connection of the chip.
As a possible implementation, the first inductor L1 is equivalent to a binding wire; the first capacitor C1 and the differential amplification unit 10 are arranged in the same chip; the balun unit 20 is disposed on the substrate; the first end of the first capacitor C1 is connected with the first end of the binding wire through a first external pin of the chip; the second end of the binding wire is connected with the power supply end of the power supply, and the differential amplification unit 10 is connected with the balun unit 20 through the first signal output pin and the second signal output pin of the chip.
As an example, the first capacitor C1 in the first LC tuning circuit 40 is provided in the same chip as the differential amplifying unit 10, and specifically, the first capacitor C1, the first amplifying transistor M1, and the second amplifying transistor M2 are provided in the same chip. The input end of the first amplifying transistor M1, the first end of the first amplifying transistor M1, the input end of the second amplifying transistor M2, the second end of the second amplifying transistor M2 and the first end of the first capacitor C1 are respectively connected to corresponding external pins of the chip, and further connected to the balun unit 20 and the power supply end 30 through the external pins of the chip.
In this embodiment, a binding wire is used as the first inductor L1, the first capacitor C1 and the specific circuit of the differential amplification unit 10 are disposed in the same chip, and the balun unit 20 is disposed on the substrate, so that the first end of the first capacitor C1 can be connected to the binding wire through the first external pin of the chip, and meanwhile, the differential amplification unit 10 is connected to the balun unit 20 through the first signal output pin and the second signal output pin of the chip, so that the occupied area of the differential amplification circuit 100 can be reduced to a greater extent.
As shown in fig. 3, as an implementation manner of the embodiment of the present application, the second LC tuning circuit 50 includes a capacitor C5 and a first inductor L5. A first terminal of the capacitor C5 is connected to the first terminal of the secondary winding B2 of the balun unit 20 as a first terminal of the second LC tuning circuit 50, a second terminal of the capacitor C5 is connected to the first terminal of the first inductor L5, and a second terminal of the first inductor L5 is grounded.
It is understood that the chip in this embodiment may be a CMOS chip, an SOI chip, or a SiGe chip. That is, the chip may be a chip manufactured by CMOS, SOI, SiGe, or the like, and is not limited herein.
In some embodiments, the positions of the first capacitor C1 and the first inductor L1 may be interchanged, that is, the first inductor L1 is close to the power supply terminal VCC side, and the first capacitor C1 is close to the ground terminal.
As one implementation, the first LC tuning circuit 40 includes a first capacitor C1 and a first inductor L1. A first terminal of the first inductor L1 is used as a first terminal of the first LC tuning circuit 40 (not shown), a second terminal of the first inductor L1 is connected to a first terminal of the first capacitor C1 (not shown), and a second terminal of the first capacitor C1 is grounded (not shown).
As shown in fig. 3, the differential amplifier circuit 100 further includes a decoupling capacitor C2, one end of the decoupling capacitor C2 is connected to the power supply terminal VCC, and the other end is grounded, for example. Here, the decoupling capacitor C2 may be used to filter out other interference signals that cannot be coupled to the radio frequency signal, so as to further improve the linearity and the signal amplification efficiency of the differential amplifier circuit 100.
In a specific implementation, the decoupling capacitor C2 may also be formed by other capacitor circuits, for example, a capacitor circuit formed by connecting a plurality of capacitors in parallel, or a variable capacitor circuit formed by a plurality of switched capacitor branches. Since the specific implementation manner of the decoupling capacitor C2 may be implemented by using an existing capacitor circuit, it is not described herein again.
Fig. 4 shows a radio frequency front end module provided in this embodiment. As shown in fig. 4, the rf front-end module 200 includes the differential amplifier circuit 100 in the above embodiment.
It can be understood that, in the radio frequency front-end module 200 provided in the present embodiment, the content and implementation manner related to the present application have been described in detail in the content of the foregoing embodiment of the differential amplifier circuit 100, and thus are not described herein again.
The units in the terminal of the embodiment of the application can be combined, divided and deleted according to actual needs.
While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention, and these modifications or substitutions are intended to be included in the scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A differential amplification circuit, comprising:
the differential amplification unit is used for amplifying the radio frequency input signal pair to obtain an amplified signal pair;
the balun unit is connected with the differential amplification unit and used for converting and synthesizing the amplification signal pair and outputting a radio frequency output signal;
a feed power supply terminal coupled to a midpoint of a primary coil of the balun unit;
and the first end of the first LC tuning unit is connected with the power supply end of the feed, the second end of the first LC tuning unit is connected with the ground end, and the first LC tuning unit is used for carrying out harmonic tuning on the amplified signal pair.
2. The differential amplifier circuit according to claim 1, wherein the differential amplifier circuit is a class F differential amplifier circuit, and the first LC tuning unit resonates at a second-order resonant frequency point; or
The differential amplification circuit is an inverse F-class differential amplification circuit, and the first LC tuning unit resonates at a third-order resonant frequency point.
3. The differential amplification circuit according to claim 1, wherein the differential amplification unit includes a first amplification transistor and a second amplification transistor;
the input end of the first amplifying transistor and the input end of the second amplifying transistor form a signal input end of the differential amplifying unit, and the signal input end is used for inputting the radio frequency input signal pair;
the first end of the first amplifying transistor is connected with the first input end of the balun unit, the second end of the first amplifying transistor and the first end of the second amplifying transistor are grounded in common, and the second end of the second amplifying transistor is connected with the second input end of the balun unit.
4. The differential amplification circuit of claim 1, wherein the first LC tuning circuit comprises a first capacitor and a first inductor;
a first end of the first capacitor is used as a first end of the first LC tuning circuit, a second end of the first capacitor is connected with a first end of the first inductor, and a second end of the first inductor is grounded; or
The first end of the first inductor is used as the first end of the first LC tuning circuit, the second end of the first inductor is connected with the first end of the first capacitor, and the second end of the first capacitor is grounded.
5. The differential amplification circuit according to claim 4, further comprising a decoupling capacitor having one end connected to the feed power supply terminal and the other end grounded.
6. The differential amplification circuit of claim 4, wherein the first inductor is equivalent to a binder wire;
the first capacitor and the differential amplifying unit are arranged in the same chip;
the balun unit is arranged on the substrate;
the first end of the first capacitor is connected with the first end of the binding wire through a first external pin of the chip, and the second end of the binding wire is connected with the power supply end of the feed;
the differential amplification unit is connected with the balun unit through a first signal output pin and a second signal output pin of the chip.
7. The differential amplification circuit according to any one of claims 1 to 6, further comprising:
and one end of the second LC tuning unit is connected with the output end of the balun unit, the other end of the second LC tuning unit is connected with the grounding end, and the second LC tuning unit is used for performing harmonic tuning on the radio frequency output signal.
8. The differential amplifier circuit according to claim 7, wherein the differential amplifier circuit is a class F differential amplifier circuit, and the second LC tuning unit resonates at a third-order resonant frequency point; or, the differential amplifying circuit is an inverse class-F differential amplifying circuit, and the second LC tuning unit resonates at a second-order resonant frequency point.
9. The differential amplification circuit of claim 3,
the first amplifying transistor is a first BJT transistor and comprises a base electrode, a collector electrode and an emitter electrode, and the base electrode of the first BJT transistor is used as the input end of the first amplifying transistor; the collector of the first BJT transistor is used as the first end of the first amplifying transistor, and the emitter of the first BJT transistor is used as the second end of the first amplifying transistor;
the second amplifying transistor is a second BJT transistor and comprises a base electrode, a collector electrode and an emitter electrode, and the base electrode of the second BJT transistor is used as the input end of the second amplifying transistor; the collector of the second BJT tube is used as the first end of the second amplifying transistor, and the emitter of the second BJT tube is used as the second end of the second amplifying transistor.
10. A radio frequency front end module comprising the differential amplifier circuit of any one of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024087846A1 (en) * | 2022-10-26 | 2024-05-02 | 深圳飞骧科技股份有限公司 | Differential power amplification circuit and radio frequency chip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024087846A1 (en) * | 2022-10-26 | 2024-05-02 | 深圳飞骧科技股份有限公司 | Differential power amplification circuit and radio frequency chip |
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