JP2012070151A - Amplifier and transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an amplifier and a transmitter that suppress deterioration of efficiency.SOLUTION: An amplifier includes a first amplification section that amplifies a signal input to an input terminal using a first amplifier element to generate a first amplification signal and a second amplification section that is connected with the first amplification section in series to amplify the first amplification signal. The amplifier also includes a transformer section that transmits the first amplification signal from the first amplification section to the second amplification section and an inductor that supplies an electric power source that drives the first amplifier element to the power supply input terminal of the first amplifier element.

Description

  Embodiments described herein relate generally to an amplifier and a transmitter that perform power amplification in a transmitter, for example.

  Various methods for supplying power to the amplifier circuit are known. In an amplifier circuit using a transformer for input and output, DC power is supplied to the amplifier element via an output transformer. For example, in a power amplifier that has a two-stage configuration and employs a power combining method in which unit amplifiers are connected in parallel to a subsequent amplification unit, an input side winding of a power distribution transformer (power distributor) that couples the front and rear amplification units Power is supplied to the preamplifier through the middle point.

  However, increasing the number of power combiners in the subsequent amplifier unit to increase the output power increases the frequency used, and as the number of power combiners in the subsequent amplifier unit increases, the scale of the power distribution transformer increases and the parasitics of the transformer supplying the power supply increase. There was a problem that the resistance increased and the efficiency deteriorated.

Debopriyo Chowdhury et al., IEEE JSSC, Vol.44, No.12, Dec.2009.

  As described above, the conventional amplifier and transmitter have a problem that the parasitic resistance of the transformer for supplying power increases and the efficiency deteriorates. The present invention has been made to solve such a problem, and an object thereof is to provide an amplifier and a transmitter in which deterioration of efficiency is suppressed.

  The amplifier according to the embodiment includes a first amplifying unit that amplifies a signal input to an input terminal using a first amplifying element to generate a first amplified signal, and a first amplifying unit that is connected in series with the first amplifying unit. A second amplifying unit for amplifying the amplified signal. The amplifier according to the embodiment drives the first amplifying element to the transformer unit that transmits the first amplified signal from the first amplifying unit to the second amplifying unit and the power input terminal of the first amplifying element. And an inductor for supplying power.

1 is a circuit diagram illustrating a configuration example of an amplifier according to a first embodiment. FIG. It is a circuit diagram which shows the structural example of the amplifier which concerns on 2nd Embodiment. It is a top view which shows the structural example of the amplifier which concerns on 3rd Embodiment. It is a circuit diagram which shows the structural example of the amplifier which concerns on 4th Embodiment. It is a circuit diagram which shows the structural example of the amplifier which concerns on 5th Embodiment. It is a figure which shows the simulation result of the common mode stability of an amplifier. It is a block diagram which shows the structural example of the transmitter which concerns on 6th Embodiment.

  Hereinafter, embodiments will be described in detail with reference to the drawings.

  (First Embodiment) As shown in FIG. 1, an amplifier 1 according to a first embodiment has a two-stage configuration in which a first amplification section 10 and a second amplification section 40 are connected in series. The input terminal of the first amplifying unit 10 is connected to the output terminal of the input transformer Tin, and the output terminal of the first amplifying unit 10 is connected to the input terminal of the distributing unit 30 and the output terminal of the power supply unit 20. . The output terminal of the distribution unit 30 is connected to the input terminal of the second amplification unit 40. The output terminal of the second amplifying unit 40 is connected to the input terminal of the combining unit 50, and the output terminal of the combining unit 50 is connected to the output terminal Out of the amplifier 1.

  The first amplifying unit 10 includes an amplifying element AMP1 such as a transistor, for example, amplifies the input signal given to the input transformer Tin to a predetermined level, and outputs the amplified signal to the distributing unit 30 as a first amplified signal. In the example shown in FIG. 1, the first amplifying unit 10 is a differential amplifier having positive and negative input terminals and positive and negative output terminals, and is configured to receive a power supply through the output terminal. That is, the amplifying element AMP1 is driven by a DC power supplied via the output terminal of the first amplifying unit 10.

The distribution unit 30 is a transformer that distributes and outputs an input signal to a predetermined number, and electromagnetically couples the first amplification unit 10 and the second amplification unit 40. In the example shown in FIG. 1, the distribution unit 30 distributes the signal given to the input terminal into two and outputs it to the output terminal. The distribution unit 30 includes transformers T _1a and T _1b corresponding to the number to be distributed. The input side coils of the transformers T _{1 a} and T _{1 b} are connected in series, and the two open ends are connected to the input terminal of the distribution unit 30. That is, the input side coils of the transformers T _1a and T _1b connected in series function as input side coils of the entire distribution unit 30. On the other hand, the output side coils of the transformers T _1a and T _1b are connected to the output terminals of the entire distributor 30 while being independent of each other. That is, the output side coils of the transformers T _{1 a} and T _{1 b} function as a plurality of output side coils of the distribution unit 30.

  The power supply unit 20 is an interface that supplies the power supply Vcc to the first amplification unit 10. The power supply unit 20 is connected in parallel to the distribution unit 30 and supplies the power supply Vcc to the amplification element AMP1 via the output terminal of the first amplification unit 10. In the example illustrated in FIG. 1, the power supply unit 20 includes an inductor L <b> 1 (inductive element) connected in parallel with the input side coil of the distribution unit 30. That is, the power supply Vcc is connected to one or more points of the inductor L1, for example, the middle point, and both terminals of the inductor L1 are connected to the output terminal of the first amplifying unit 10. At this time, it is desirable that the impedance characteristics of the inductor L1 viewed from the positive and negative output terminals of the first amplifying unit 10 are equal. This is to improve the balance characteristic between the differential signals. When the inductor L1 is realized by a spiral inductor or the like, the power source Vcc may be connected to the middle point of the winding length. The inductor L1 functions to prevent a high-frequency current flowing through the AMP1 from leaking out of the amplifier via the power supply Vcc and to supply a DC power supply to the amplifying element AMP1.

Further, when the impedance of the inductor L1 is low at the frequency of the amplified signal and is equal to or lower than the impedance expected for the input side coil of the distribution unit 30, the inductor L1 can also be used as a matching element for signal connection. . As the inductance value of the inductor increases, the parasitic resistance generally increases, leading to an increase in power supply loss of the first amplifying unit 10 and a decrease in PAE (power added efficiency) of the entire amplifier 1. However, if the impedance of the inductor L1 is set too low, the level of the first amplified signal transmitted to the second amplifying unit 40 via the distributing unit 30 is lowered, so that the second amplifying unit 40 has a high amplification gain. As a result, the PAE of the entire amplifier 1 is lowered. Therefore, it is desirable that the inductance value of the inductor L1 is determined so as to improve the PAE, gain, and linearity of the entire amplifier 1 in consideration of the element values of the transformers T _1a and T _1b constituting the distribution unit 30.

  The second amplifying unit 40 includes amplifying elements AMP2a and AMP2b that are independent from each other and connected in parallel in an AC manner. The input terminals of the second amplifying unit 40 are connected to the input terminals of the amplifying elements AMP2a and AMP2b, respectively. Yes. Similarly, the output terminal of the second amplifying unit 40 is connected to the output terminals of the amplifying elements AMP2a and AMP2b, respectively. That is, the signal distributed by the distribution unit 30 is independently amplified by the amplification elements AMP2a and AMP2b of the second amplification unit 40. The number of amplifying elements included in the second amplifying unit 40 can be determined in consideration of necessary output power, impedance conversion ratio, ability of the amplifying elements, and the like.

The synthesizer 50 is a transformer that synthesizes and outputs a predetermined number of input signals. In the example illustrated in FIG. 1, the combining unit 50 combines two signals given to the input terminal into one and outputs the combined signal to the output terminal. The combining unit 50 includes transformers T _2a and T _2b corresponding to the number to be combined. The input side coils of the transformers T _2a and T _2b are independently connected to the input terminals of the entire synthesis unit 50. On the other hand, the output side coils of the transformers T _2a and T _2b are connected in series, and the two open ends are connected to the output terminal of the combining unit 50.

  The amplifier 1 may be realized by disposing discrete components on a substrate, or may be realized as an integrated circuit component on a silicon substrate.

  Here, the operation of the amplifier 1 will be briefly described. The input signal input to the input transformer Tin is given to the amplifying element AMP1 of the first amplifying unit 10. The amplifying element AMP1 amplifies the input signal to a predetermined level, and provides it to the input terminal of the distribution unit 30 as a first amplified signal. At this time, power is supplied to the amplifying element AMP1 through the inductor L1 of the power supply unit 20 and the output terminal of the first amplifying unit 10.

The first amplified signal is supplied to the input side transformer of the transformer _{T 1a} and _{T 1b} of the distribution unit 30, is output from the output terminal of the distributed distribution unit 30 by the transformer _{T 1a} and _{T 1b.}

  The amplifying elements AMP2a and AMP2b of the second amplifying unit 40 amplify the first amplified signal distributed by the distributing unit 30 to a predetermined level, respectively, and supply the amplified signal to the input terminal of the combining unit 50 as a second amplified signal. At this time, the power supplies of the amplification elements AMP2a and AMP2b are directly supplied to the amplification elements AMP2a and AMP2b, respectively.

The two second amplified signals are synthesized by the transformers T _2a and T _2b of the synthesizer 50, and output from the open ends of the output side coils of the transformers T _2a and T _2b connected in series. In the example shown in FIG. 1, one end of the open end is connected to the output terminal Out of the amplifier 1, and the other end is connected to the ground.

  Thus, in the amplifier 1 of this embodiment, the power supply to the amplification element AMP1 of the first amplification unit that is the previous amplification unit is not from the distribution unit 30 that couples the first amplification unit 10 and the second amplification unit 40. This is performed via the inductor L1 of the power supply unit 20 provided separately. Since the number of inductors connected in series in the input side coil of the distribution unit 30 increases in accordance with the number of distributions, when the power is supplied to the first amplifying unit 10 via the distribution unit 30, the amount of increase in the number of inductors increases. Only the loss increases. On the other hand, the inductor L1 of the power supply unit 20 has only to determine the value of the inductor from the viewpoint of purely removing leakage of high-frequency current, and thus the loss does not increase beyond a certain level. That is, in this embodiment in which power is supplied to the first amplifying unit 10 via the inductor L1 of the power supply unit 20, loss can be suppressed. In particular, as the number of power combining (the number of amplifying elements) by the second amplifying unit 40 in the subsequent stage increases, the loss in the distributing unit 30 increases, and thus the loss suppression effect increases.

  In the above embodiment, the two-stage configuration of the first amplifying unit as the previous stage and the second amplifying section as the subsequent stage has been described. However, the present invention is not limited to this. It may have three or more stages. In the above-described embodiment, the first amplifying unit 10 is described as including one amplifying element AMP1. However, like the second amplifying unit 40, two or more amplifying elements connected in parallel in an AC manner are included. It doesn't matter. Similarly, in the above embodiment, the second amplifying unit 40 has been described as having two amplifying elements, but one may be used.

  (Second Embodiment) Next, an amplifier according to a second embodiment will be described with reference to FIG. In the amplifier of this embodiment, a cascode amplifier in which two or more stages of amplification elements are stacked is used as the first amplification unit and the second amplification unit in the amplifier of the first embodiment. In the following description, components common to those of the amplifier according to the first embodiment are denoted by common reference numerals, and redundant description is omitted.

  As shown in FIG. 2, the amplifier 2 of this embodiment has a two-stage configuration in which a first amplifying unit 12 and a second amplifying unit 42 are connected in series. The input terminal of the first amplifying unit 12 is connected to the output terminal of the input transformer Tin, and the output terminal of the first amplifying unit 12 is connected to the input terminal of the distributing unit 32 and the output terminal of the power supply unit 20. . The output terminal of the distribution unit 32 is connected to the input terminal of the second amplification unit 42. The output terminal of the second amplifying unit 42 is connected to the input terminal of the combining unit 52, and the output terminal of the combining unit 52 is connected to the output terminal Out of the amplifier 2.

  The first amplifying unit 12 includes field effect transistors Q1 and Q2, and Q3 and Q4 that are cascode-connected. One output terminal of the input transformer Tin is connected to the gate of Q1 whose source is grounded, and the other output terminal is connected to the gate of Q3 whose source is grounded. The drain of Q1 is connected to the source of Q2 whose drain is connected to one output terminal of the first amplifying unit 12, and the drain of Q3 is connected to the other output terminal of the first amplifying unit 12. Q4 source is connected. A bias voltage source Vbias2 is connected to the gates of Q2 and Q4. Between the input terminals of the first amplifying unit 12, a resistor and a capacitor connected in series are connected in parallel, and a bias voltage source Vbias1 is connected to a connection point between the resistors. That is, the bias voltage to Q1 and Q3 is determined by the voltage value of Vbias1.

  The output terminals of the first amplifying unit 12, that is, the drains of Q2 and Q4, are connected to both ends of the input terminal of the distributing unit 32 and the coil of the power supply unit 20, respectively.

In this embodiment, the second amplifying unit 42 includes four amplifying elements AMP2c to AMP2f connected in parallel in an AC manner. That is, the distribution unit 32 of this embodiment distributes the first amplified signal output from the first amplification unit 12 into four. The distribution unit 32 includes transformers T _1c to T _1f, and has the same basic configuration and function except that the number of distribution is different from that of the distribution unit 30 of the first embodiment.

  The second amplifying unit 42 includes four amplifying elements AMP2c to AMP2f, and the amplifying elements AMP2c to AMP2f are respectively in common with the amplifying elements AMP1 constituting the first amplifying unit 12. That is, the amplifying element AMP2c constituting the second amplifying unit 42 includes four transistors Q5 to Q8, a bias supply resistor and a capacitor connected between the input terminals. The circuit configuration of the amplifier elements AMP2c to AMP2f is the same as that of the amplifier element AMP1.

The combining unit 52 has a common configuration and function except for the number of inputs to be combined with the combining unit 50 of the first embodiment. As shown in FIG. 2, in the synthesis unit 52 of this embodiment, the midpoints of the four input side coils are connected to the power supply Vcc. That is, in the second amplifying unit 42 of this embodiment, power is supplied to each of the amplifying elements AMP2c to AMP2f via the midpoint of the input side coil of the combining unit 52. In the example shown in FIG. 2, power supply Vcc is connected to the drain of the transistors Q6 and Q8 via the center point of the input-side coil of the transformer T _2c. The output side coil of the synthesizer 52 is connected to the output terminal Out of the amplifier 2.

  According to the amplifier 2 of this embodiment, since the transistors constituting the amplifying elements are cascode-connected, the isolation and gain between the signal input and output in the amplifying element unit are improved, and the reliability is improved by relaxing the breakdown voltage of the amplifying elements. Etc. can be expected. For example, when amplifying elements having different gate oxide film pressures and withstand voltages can be mixed by a CMOS process or the like, a high withstand voltage device is provided on the upper stage side (output side in the example of FIG. 2), and the lower stage side (also input side). By disposing a device having a low withstand voltage and a high gm (mutual conductance) value, the function can be further improved. Note that the element constants of the upper and lower devices (transistors) may be determined to be preferable values from the viewpoint of the linearity and efficiency of the amplifier in the case of a linear amplifier, for example. In the above description, the transistor constituting the amplifying element is described as a field effect transistor. However, a junction transistor (BJT) may be used.

  (Third Embodiment) Next, an amplifier according to a third embodiment will be described with reference to FIG. FIG. 3 shows a detailed configuration of the power supply unit and the distribution unit in the amplifier of this embodiment. In the amplifier of this embodiment, the configuration of the power supply unit 20 of the amplifiers of the first and second embodiments is a differential winding inductor. In the following description, components common to the amplifiers of the first and second embodiments are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 3, the amplifier of this embodiment is formed on a substrate S. The power supply unit 23 in the amplifier of this embodiment is constituted by a differential winding inductor formed on the substrate S. The differential winding type inductor is realized as a pattern in which the windings are formed along the main surface of the substrate S, and has the same area as a general spiral inductor by utilizing the mutual inductance between the windings. Thus, a higher inductance value and Q value (quality factor) can be obtained. According to the amplifier of this embodiment, since the differential winding type inductor is used as the inductor of the power supply unit, the mounting area can be reduced and the efficiency of the entire amplifier can be improved. In the example shown in FIG. 3, the distribution unit 33 is also configured by a differential winding type inductor. However, the same effect can be obtained by configuring the synthesis unit (not shown) using the differential winding type inductor. Can do.

  (Fourth Embodiment) Next, an amplifier according to a fourth embodiment will be described with reference to FIG. The amplifier of this embodiment is obtained by further adding a harmonic processing element to the amplifier of the first embodiment. In the following description, components common to those of the amplifier according to the first embodiment are denoted by common reference numerals, and redundant description is omitted.

  As shown in FIG. 4, the amplifier 4 of this embodiment includes a harmonic processing element 24 connected in parallel with the output terminal of the power supply unit 20 and the input terminal of the distribution unit 30. The harmonic processing element 24 is an element that suppresses harmonics generated in the amplifier 4, and is, for example, a filter circuit including a capacitor and an inductor. By setting the constant of the harmonic processing element 24 to a value that considers the impedance characteristics of the amplifier 4 with respect to the harmonic component of the first amplified signal, the linearity and efficiency of the entire amplifier 4 can be improved. In particular, by setting the constant of the harmonic processing element 24 to an element value that reduces the impedance with respect to the second harmonic component of the first amplified signal, the linearity is maintained while suppressing the harmonic component. , Can improve efficiency.

  In the example shown in FIG. 4, the harmonic processing element 24 is added to the amplifier of the first embodiment, but the harmonic processing element is added to the amplifier of the second embodiment or the third embodiment. Even if it adds, the same effect can be acquired.

  (Fifth Embodiment) Next, an amplifier according to a fifth embodiment will be described with reference to FIG. The amplifier of this embodiment is obtained by adding a power supply unit to the amplifier of the first embodiment. In the following description, components common to those of the amplifier according to the first embodiment are denoted by common reference numerals, and redundant description is omitted.

  As shown in FIG. 5, the amplifier 5 of this embodiment has a two-stage configuration in which a first amplifying unit 10 and a second amplifying unit 40 are connected in series. The input terminal of the first amplifying unit 10 is connected to the output terminal of the input transformer Tin, and the output terminal of the first amplifying unit 10 is connected to the input terminal of the distributing unit 35 and the output terminal of the power supply unit 20. . The output terminal of the distribution unit 35 is connected to the input terminal of the second amplification unit 40. The output terminal of the second amplifying unit 40 is connected to the input terminal of the combining unit 50, and the output terminal of the combining unit 50 is connected to the output terminal Out of the amplifier 4.

Similar to the distribution unit 30 of the first embodiment, the distribution unit 35 is a transformer that distributes and outputs an input signal to a predetermined number, and includes transformers T _1g and T _1h corresponding to the number to be distributed. The first amplifying unit 10 and the second amplifying unit 40 are coupled. The transformers T _1g and T _1h correspond to the transformers T _1a and T _1b of the first embodiment, respectively, and have the same configuration and function. The input side coils of the transformers T _1g and T _1h are connected in series, and the two open ends are connected to the input terminal of the distribution unit 35. Here, the power supply Vcc is connected to the connection point 35a of the input side coils of the transformers _T1g and _T1h . The input side coils of the transformers T _1a and T _1b connected in series function as input side coils of the entire distribution unit 35. On the other hand, the output side coils of the transformers T _1a and T _1b are connected to the output terminals of the entire distributor 35 while being independent of each other. That is, the output side coils of the transformers T _1a and T _1b function as a plurality of output side coils of the distribution unit 35.

As shown in FIG. 5, the power source Vcc connected to the connection point 35 a is connected to the output terminal of the first amplifying unit 10 through the input side coils of the transformers T _{1 g} and T _{1 h} and the input terminal of the distribution unit 35. Has been. As described above, the first amplifying unit 10 is configured to be able to receive the driving power of the amplifying element AMP1 through the output terminal. Therefore, the first amplifying unit 10 of this embodiment includes the power supply unit 20 and the connection point 35a. Power will be supplied from the place. In the example shown in FIG. 5, the connection point 35a supplies power from only one place on the input side coil of the distribution unit 35, but it may be supplied from two or more places. The power supply Vcc supplied to the power supply unit 20 and the power supply Vcc supplied to the connection point 35a may be a common power supply or may be independent, but it is preferable that the supply voltage values are equal.

In the amplifier 5 of this embodiment, power supply to the amplification element AMP1 of the first amplification unit 10 is performed in parallel from the two points of the power supply unit 20 and the connection point 35a. As a result, the parasitic resistance from the power supply Vcc to the power supply connection point of the amplifying element AMP1 is the parasitic resistance of the inductor L1 and the parasitic resistances of the input side coils of the transformers _T1g and _T1h connected in parallel. That is, the loss can be suppressed as compared with the amplifier of the first embodiment, which is effective for improving the PAE of the entire amplifier 5.

In addition, when the transformers T _1g and T _1h forming the distribution unit 35 are integrated on a substrate made of silicon or the like, unnecessary oscillation in the common mode may occur due to the influence of parasitic capacitance between the winding and the substrate. In the amplifier 5 of this embodiment, the input side coil of the distribution unit 35 is connected to the power source (reference voltage source) with low impedance, so that stability against oscillation can be improved. In addition, it is preferable that the impedance from the connection point 35a to each of the positive / negative output terminals of the 1st amplification part 10 is equal, respectively. This is because the balance characteristic between the differential signals is improved.

  In the example shown in FIG. 5, the connection point 35a is added to the amplifier of the first embodiment, but the same effect can be obtained even if the connection point 35a is added to the amplifiers of the second to fourth embodiments. be able to.

  (Simulation Characteristic Example) Here, with reference to FIG. 6, the simulation result of the loss of the amplifier according to the embodiment and the stability coefficient K for the common mode signal will be described.

  First, when (1) the power supply to the amplifying element AMP1 of the first amplifying unit 10 is performed via the power supply unit 20 as in the first and second embodiments, (2) in the fifth embodiment When the power supply to the amplification element AMP1 of the first amplifying unit 10 is performed through the power supply unit 20 and the connection point 35a, and (3) the power supply unit 20 is removed in the fifth embodiment ( The impedance from the power supply Vcc to the power supply terminal to the amplification element AMP1 of the first amplifying unit 10 was obtained.

Simulation results impedance _{X LC} is obtained values of 1.23Ω when the impedance _{X L1} is 0.19Ω case, (2) the impedance _{X L5} when the 0.16Omu, (3) (1) It was. That is, in the amplifier according to the embodiment, it is understood that the impedance from the power supply Vcc to the power supply terminal of the amplification element AMP1 of the first amplifying unit 10 can be suppressed lower than in the conventional comparative example, and a lower loss amplifier can be realized. It was.

  Further, regarding the above (2) and (3), the value of the stability coefficient K with respect to the common mode signal was examined. FIG. 6 is a diagram showing the relationship between the frequency and the stability coefficient K in each of the cases (2) and (3). As a result, as shown in FIG. 6, the amplifier of the fifth embodiment was able to obtain a better stability coefficient than the conventional amplifier.

  (Sixth Embodiment) Next, a transmitter according to a sixth embodiment will be described with reference to FIG. The transmitter of this embodiment uses the amplifier of the first to fifth embodiments as a power amplifier of the transmitter. In the following description, components common to the amplifiers of the first to fifth embodiments are denoted by common reference numerals, and redundant description is omitted.

  As shown in FIG. 7, the transmitter 6 of this embodiment includes a power amplifier 90 including a baseband signal processing unit 60, a local signal oscillation unit 70, a mixer 80, and the amplifiers according to the first to fifth embodiments. ing.

  The baseband signal processing unit 60 modulates a desired signal and generates a baseband signal. The local signal oscillator 70 generates a local signal for converting the signal generated by the baseband signal processor 60 into a predetermined transmission frequency. The mixer 80 multiplies the signal generated by the baseband signal processing unit 60 and the local signal generated by the local signal oscillation unit 70 to generate a transmission signal having a predetermined transmission frequency. The power amplifying unit 90 amplifies the transmission signal generated by the mixer 80 to a predetermined power level and transmits it through the antenna ANT.

  According to the transmitter of this embodiment, since the amplifiers according to the first to fifth embodiments are used as power amplifiers, the efficiency can be improved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Amplifier 10 ... 1st amplification part, 20 ... Power supply part, 30 ... Distribution part, 40 ... 2nd amplification part, 50 ... Synthesis | combination part.

Claims (7)

A first amplifying unit for amplifying a signal input to the input terminal using the first amplifying element to generate a first amplified signal;
A second amplifier connected in series with the first amplifier to amplify the first amplified signal;
A transformer for transmitting the first amplified signal from the first amplifying unit to the second amplifying unit;
An amplifier comprising: an inductor for supplying power for driving the first amplifying element to a power input terminal of the first amplifying element. The second amplifying unit includes a plurality of second amplifying elements that amplify the one amplified signal in parallel,
The amplifier according to claim 1, wherein the transformer unit includes a distributor that distributes the first amplified signal and transmits the first amplified signal to each of the second amplifying elements. The first amplifying unit includes a plurality of the first amplifying elements,
3. The amplifier according to claim 2, wherein the first amplifying element is cascode-connected between a signal line and a ground.   4. The amplifier according to claim 3, wherein the inductor comprises a differential winding inductor.   5. The amplifier according to claim 4, wherein a filter element for removing a harmonic component of the first amplified signal is connected between the first amplifying unit and the transformer unit.   5. The amplifier according to claim 4, wherein the transformer unit further supplies power for driving the first amplifying element to a power input terminal of the first amplifying element. A baseband signal generator for generating a modulated baseband signal;
An oscillator for generating a local signal for converting the baseband signal into a predetermined transmission frequency;
A mixer that multiplies the baseband signal and the local signal to generate a transmission signal;
A transmitter comprising: the amplifier according to any one of claims 1 to 6 that amplifies the transmission signal to a predetermined power.

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