Differential amplification apparatus with phase corrector

Abstract

The present invention relates to a differential amplifier having a phase corrector. According to the present invention, a differential amplifier having a phase corrector comprises: a differential amplifier that receives a differential signal input to an input terminal through first and second input signal lines, amplifies it, and outputs it to an output terminal through first and second output signal lines; and a phase corrector provided on one of the first and second output signal lines selected, which corrects the phase of an output signal introduced into the corresponding output signal line and provides it to the output terminal.

Description

Technology Field

[0001] The present invention relates to a phase corrector, and more specifically, to a phase corrector capable of correcting phase errors that occur in electronic circuits due to various parasitic components and unintended reasons. Background Technology

[0002] Figure 1 is a diagram illustrating the concept of a general differential circuit. In Figure 1, V IN1 and V IN2 is a differential input signal, and V OUT1 and V OUT2 is a differential output signal. Therefore, ideally, V IN1 and V IN2 The magnitudes must be the same, but their phases must be opposite to each other, so the phase difference must be 180°. Likewise, V OUT1 and V OUT2 The magnitudes must be the same, but their phases must be opposite to each other, so the phase difference must be 180°.

[0003] Figure 2 shows V in the ideal case. IN1 and V IN2 and V OUT1 and V OU2 This is a diagram showing the signal waveform of. In Fig. 2, V IN1 and V OUT1 It is a black solid line, V IN2 and V OUT2 is indicated by a gray solid line. As shown in Fig. 2, V IN1 and V IN2 Ideally, they are identical in magnitude and have a phase difference of 180°. Similarly, V OUT1 and V OUT2 Ideally, they are equal in size and have a phase difference of 180°.

[0004] At this point, for the convenience of explanation, V OUT1 and V OUT2 is the input V respectively IN1 and V IN2 I will explain this in terms of the output signal. That is, the input signal VIN1 The output signal for is V OUT1 is, V IN2 The output signal for is V OUT2 This is the case. Ideally, the phase difference between the input signal and the output signal is 0° or 180°, but for the convenience of explanation in this invention, the phase difference between the input signal and the output signal will be assumed to be 180°.

[0005] FIG. 3 is a diagram showing the differential signals of FIG. 2 superimposed. That is, FIG. 3 is the differential input signal V shown in FIG. 2. IN1 and V IN2 It is represented by overlaying on a single graph, and its differential output signal V OUT1 and V OUT2 It is also expressed by overlapping.

[0006] While Figures 2 and 3 show waveforms for an ideal differential signal, actual differential circuits generally exhibit phase errors in the differential signal due to circuit asymmetry, non-ideal operation of components, and parasitic components.

[0007] FIG. 4 is a diagram showing an example of differential input signal and differential output signal waveforms when a phase error occurs in the differential input signal. The example shown in FIG. 4 is, V IN1 Although it must be input as shown by this solid black line, if it is input as shown by the dotted black line, the phase difference between the differential input signals deviates from 180°, causing a phase error in the differential input signals. This phase error in the differential input signals is also reflected in the differential output signal. That is, the ideal V OUT1 is a solid black line, but V of the black dotted line is an abnormal input signal. IN1 V for OUT1 It appears as a black dotted line, and thus phase error occurs in the differential output signal as well.

[0008] The possibility of phase error occurrence in such differential signals can be summarized as follows.

[0009] ① Cases where a phase error occurs in the differential input signal and is reflected in the differential output signal

[0010] ② Cases where there is no phase error in the differential input signal, but a phase error occurs in the differential output signal due to a phase error in the differential circuit

[0011] ③ Cases where a phase error exists in the differential input signal and an additional phase error occurs in the differential circuit, resulting in the phase error of the differential input signal and the phase error of the differential output signal appearing different from each other

[0012] Among these, case ③ is the most common case, and in actual situations, although the degree varies, phase error exists in the differential input signal, and it is common for additional phase error to occur within the differential circuit.

[0013] As such, it is common for phase errors to occur in differential input and output signals in differential circuits. However, if a phase error occurs between differential signals, signal distortion occurs, leading to a problem where circuit performance degrades depending on the nature of the circuit. That is, for example, if a phase error occurs in the differential input signal, V IN1 -V IN2 If the signal is distorted and a phase error occurs in the differential output signal, V OUT1 -V OUT2 There is a problem where the signal is distorted, causing the performance of the differential circuit to degrade.

[0014] In differential circuits based on such conventional technology, phase errors between differential signals are common. Conventional methods to suppress the resulting performance degradation of the differential circuit typically involve suppressing phase errors in the differential signals through the sophisticated design of the differential circuit. However, this approach does not constitute a fundamental solution capable of suppressing phase errors that have already occurred.

[0015] In particular, phase errors occurring between differential signals in a differential circuit cause performance degradation. Therefore, technology capable of eliminating phase errors occurring between differential signals is required.

[0016] The technology forming the background of the present invention is disclosed in Korean Registered Patent No. 10-2151073 (published September 2, 2020). The problem to be solved

[0017] The present invention aims to provide a phase corrector capable of correcting phase errors by providing a phase correction circuit on a signal line to eliminate phase errors occurring between differential signals. means of solving the problem

[0018] The present invention comprises a differential amplifier having a phase corrector, wherein the differential signal input to an input terminal is received through first and second input signal lines, amplified, and output to an output terminal through first and second output signal lines; and a phase corrector provided on one of the first and second output signal lines selected, which corrects the phase of an output signal introduced into the output signal line and provides it to the output terminal.

[0019] In addition, the phase corrector may be provided on each of the first and second output signal lines.

[0020] And, the present invention comprises a differential amplifier having a phase corrector, wherein the differential amplifier receives a differential signal input to an input terminal through first and second input signal lines, amplifies it, and outputs it to an output terminal through first and second output signal lines; and a phase corrector provided on one of the first and second input signal lines selected, which corrects the phase of an input signal introduced into the input signal line and applies it to the differential amplifier.

[0021] In addition, the phase corrector may be provided on each of the first and second input signal lines.

[0022] In addition, the present invention may include a differential amplifier having a phase corrector, wherein the differential signal input to an input terminal is received through first and second input signal lines, amplified, and output to an output terminal through first and second output signal lines; a first phase corrector provided on one selected input signal line among the first and second input signal lines, which corrects the phase of an input signal introduced into the input signal line and applies it to the differential amplifier; and a second phase corrector provided on one selected output signal line among the first and second output signal lines, which corrects the phase of an output signal introduced into the output signal line and provides it to the output terminal.

[0023] In addition, the first phase corrector and the second phase corrector may each be provided on the first input signal line and the first output signal line, or on the second input signal line and the second output signal line.

[0024] Additionally, the first phase corrector may be provided on each of the first and second input signal lines, and the second phase corrector may be provided on each of the first and second output signal lines.

[0025] In addition, the phase corrector corrects the phase of a signal input through a first stage and outputs it through a second stage, and may have a structure in which a passive component and a variable capacitor are connected in parallel between the first stage and the second stage.

[0026] Additionally, the passive component may be an inductor or a resistor, and the variable capacitor may be a varactor.

[0027] In addition, the phase corrector corrects the phase of a signal input through a first stage and outputs it through a second stage, and has a structure in which a transistor and a variable capacitor are connected in parallel between the first stage and the second stage, and a bias voltage can be applied to the gate of the transistor. Effects of the invention

[0028] According to the present invention, a phase corrector is provided on a signal line where the removal of phase errors is required, thereby allowing for the removal or correction of phase errors that have already occurred due to various unpredictable reasons. Accordingly, the need to finely identify the cause of the phase error in advance is reduced, thereby enabling the effective suppression of phase errors in electronic circuits. Brief explanation of the drawing

[0029] Figure 1 is a diagram illustrating the concept of a general differential circuit. Figure 2 shows V in the ideal case. IN1 and V IN2 and V OUT1 and V OU2 This is a diagram showing the signal waveform of. Figure 3 is a diagram showing the differential signals of Figure 2 superimposed on each other. Figure 4 is a diagram showing an example of differential input signal and differential output signal waveforms when a phase error occurs in the differential input signal. Figure 5 is a diagram illustrating the phase error in a typical differential signal. FIG. 6 is a diagram showing the configuration of a differential amplifier having a phase corrector according to a first embodiment of the present invention. Figure 7 is a drawing showing a variation of Figure 6. FIG. 8 is a diagram showing the configuration of a differential amplifier having a phase corrector according to a second embodiment of the present invention. Figure 9 is a drawing showing a variation of Figure 8. FIG. 10 is a diagram showing the configuration of a differential amplifier having a phase corrector according to a third embodiment of the present invention. Figure 11 is a drawing showing a variation of Figure 10. FIG. 12 shows the differential input signal V in an ideal situation for the differential circuit. IN1 and V IN2 This is a diagram illustrating an application example for the case where a phase error occurs between them. FIG. 13 shows the differential input signal V in an ideal situation for the differential circuit. IN1 and V IN2 This is a diagram illustrating another application example for the case where a phase error occurs between them. Figure 14 is a diagram showing a case where a phase corrector is provided on one of the two output signal lines in a situation where the differential circuit is not ideal. FIG. 15 is a diagram showing a case where a phase corrector is provided on one of the two input signal lines in a situation where the differential circuit is not ideal. FIG. 16 is a drawing showing an embodiment in which a phase corrector according to the present invention is provided on an input signal line of a general single-ended electronic circuit. FIG. 17 is a drawing showing an embodiment in which a phase corrector according to the present invention is provided on the output signal line of a general single-ended electronic circuit. FIG. 18 is a drawing showing an embodiment in which a phase corrector according to the present invention is provided on each of the input signal line and output signal line of a general single-ended electronic circuit. FIGS. 19 to 21 are drawings showing examples of implementation of a phase corrector according to an embodiment of the present invention. Specific details for implementing the invention

[0030] Then, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification have been given similar reference numerals.

[0031] Throughout the specification, when a part is described as being "connected" to another part, this includes not only cases where they are "directly connected," but also cases where they are "electrically connected" with other components interposed between them. Furthermore, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0032] The present invention is applicable to all circuits requiring phase correction, but the correction of phase errors between differential signals in a differential circuit is described as one example. The correction of phase errors between differential signals in a differential circuit is one of the embodiments of the phase correction example according to the present invention, and the scope of the rights of the present invention is not limited to phase correction applied to differential circuits.

[0033] Accordingly, although the case of a differential circuit is described below as a representative embodiment in which a phase corrector according to the present invention is provided in an electronic circuit, the scope of the invention extends not only to differential circuits but also to cases where phase correction is required in general single-ended circuits, etc.

[0034] For the sake of convenience of explanation, two given signals are defined as differential signals when they have the same magnitude and opposite phases with a phase difference of 180°. Additionally, the degree to which the phases of the two signals constituting the differential signal deviate from 180° is defined as the phase error of the differential signal.

[0035] Figure 5 illustrates the phase error in a typical differential signal. Figure 5 shows a more magnified view of the signal waveform when a phase error occurs between differential signals in a differential circuit. That is, in Figure 5, when the black solid line and the gray solid line represent ideal differential signals, the differential signals have the same magnitude and a phase difference of 180°.

[0036] At this time, if the signal of the black solid line is distorted into the signal of the black dotted line, a phase error occurs between the differential signals. For the convenience of explanation, the phase error will be defined as φ as shown in Fig. 5.

[0037] In the case of conventional technology, since the method of suppressing the occurrence of phase errors involves finely identifying the cause of the phase error and fundamentally eliminating the cause, there are limitations in eliminating the phase error.

[0038] The present invention is a technology for eliminating phase errors that have already occurred due to various unpredictable reasons. By providing a phase corrector on a signal line where the elimination of phase errors is required, the technology corrects the already occurred phase errors. This reduces the need to meticulously identify the causes of the phase errors in advance, thereby providing the advantage of effectively suppressing phase errors in electronic circuits.

[0039] FIG. 6 is a diagram showing the configuration of a differential amplifier having a phase corrector according to a first embodiment of the present invention.

[0040] As shown in FIG. 6, a differential amplifier device (100) according to the first embodiment of the present invention includes a differential amplifier (110) and a phase corrector (120).

[0041] The differential amplifier (110) can receive a differential signal input to the input terminal through the first and second input signal lines, amplify it, and output it to the output terminal through the first and second output signal lines. That is, the differential amplifier (110) receives the input differential input signal (V IN1 ,V IN2 Amplifying ) to differential output signal (V OUT1 ,V OUT2 Can output ).

[0042] As in the usual case, the input terminal is V among the differential input signals IN The first input terminal to which this is input and V IN2 Each may include a second input terminal to which this is input, and the output terminal is V among the differential output signals OUT1 The first output terminal that outputs this and V OUT2 Each of these may include a second output terminal that outputs.

[0043] A phase corrector (120) is provided on one of the first and second output signal lines selected, and can correct the phase of an output signal introduced into the corresponding output signal line and provide it to an output terminal. In the case of FIG. 6, the phase corrector (120) is installed on the first output signal line and corrects the phase of the signal introduced into the first output signal line to φ OUT1 Correct by that amount, and the phase-corrected signal is given to the first output terminal (V OUT1 ) exemplifies conveying to.

[0044] FIG. 7 is a drawing showing a variation of FIG. 6. As shown in FIG. 7, a phase corrector (120) may be provided on each of the first output signal line and the second output signal line. In this case, the first and second output signal lines can each be phase corrected by different phase correctors, and since a phase corrector is provided on each of the first and second output signal lines, the magnitude error of the differential output signal can also be suppressed.

[0045] FIG. 8 is a diagram showing the configuration of a differential amplifier having a phase corrector according to a second embodiment of the present invention.

[0046] As shown in FIG. 8, a differential amplifier device (200) according to a second embodiment of the present invention includes a differential amplifier (210) and a phase corrector (220).

[0047] The differential amplifier (210) can receive the differential signal input to the input terminal through the first and second input signal lines as described above, amplify it, and output it to the output terminal through the first and second output signal lines. That is, the input differential input signal (V IN1 ,V IN2 Amplifying ) to differential output signal (V OUT1 ,V OUT2 Can output ).

[0048] A phase corrector (220) is provided on one of the first and second input signal lines selected, and can correct the phase of an input signal introduced into the input signal line and apply it to a differential amplifier (210). In the case of FIG. 8, the phase corrector (220) is installed on the first input signal line and corrects the phase of the signal introduced into the first input signal line to φ IN1 An example is provided of correcting the phase-corrected signal to a differential amplifier (210).

[0049] FIG. 9 is a drawing showing a variation of FIG. 8. As shown in FIG. 9, a phase corrector (220) may be provided on each of the first input signal line and the second input signal line. In this case, the first and second input signal lines can each be phase corrected by different phase correctors, and since a phase corrector is provided on each of the first and second input signal lines, the magnitude error of the differential input signal can also be suppressed.

[0050] FIG. 10 is a diagram showing the configuration of a differential amplifier having a phase corrector according to a third embodiment of the present invention.

[0051] As shown in FIG. 10, a differential amplifier device (300) according to the third embodiment of the present invention includes a differential amplifier (310), a first phase corrector (320-1), and a second phase corrector (320-2).

[0052] The differential amplifier (310) can receive the differential signal input to the input terminal through the first and second input signal lines as described above, amplify it, and output it to the output terminal through the first and second output signal lines. That is, the input differential input signal (V IN1 ,V IN2 Amplifying ) to differential output signal (V OUT1 ,V OUT2 Can output ).

[0053] The first phase corrector (320-1) is provided on one of the first and second input signal lines selected, and the phase of the input signal introduced into the input signal line is φ IN1 It can be applied to a differential amplifier by correcting it by that amount.

[0054] The second phase corrector (320-2) is provided on one of the first and second output signal lines selected, and the phase of the output signal introduced into the corresponding output signal line is φ OUT1 It can be corrected to that extent and provided to the output stage.

[0055] At this time, the first phase corrector (320-1) and the second phase corrector (320-2) may each be provided on the first input signal line and the first output signal line as shown in FIG. 10, or conversely, on the second input signal line and the second output signal line.

[0056] FIG. 11 is a drawing showing a variation of FIG. 10. As shown in FIG. 11, a first phase corrector (320-1) may be provided on each of the first input signal line and the second input signal line, and a second phase corrector (320-12) may be provided on each of the first output signal line and the second output signal line.

[0057] The following describes in more detail an application example of a differential amplifier device having such a phase corrector.

[0058] FIG. 12 shows the differential input signal V in an ideal situation for the differential circuit. IN1 and V IN2 This is a diagram illustrating an application example for the case where a phase error occurs between them.

[0059] In Fig. 12, for ease of understanding, the input V IN1 Cases deviating from this ideal phase are indicated by black dotted lines, while cases where the phase is corrected through a phase corrector are indicated by black solid lines.

[0060] In this case, as with the method of FIG. 8 described above, a phase corrector is provided on the first input signal line, which is one of the two input signal lines, so that V IN1 and V IN2 This is an example of securing a 180° phase difference at the input side of the differential circuit by correcting the phase error that occurred between them.

[0061] This allows a differential input signal with phase error removed to be applied to the differential circuit. In this case, assuming the differential circuit is ideal, the differential output signal also appears in a form with phase error removed.

[0062] FIG. 13 shows the differential input signal V in an ideal situation for the differential circuit. IN1 and V IN2 This is a diagram illustrating another application example for the case where a phase error occurs between them.

[0063] In this Fig. 12, V, which is a differential input signal, is identical to Fig. 12. IN1 and V IN2 In the case where a phase error occurs between them, a phase corrector is provided on the first output signal line, which is one of the two output signal lines, as in the method of FIG. 6, V OUT1 and V OUT2 This is an example of securing a phase difference of 180° at the output side of the differential circuit by correcting the phase error that occurred between them.

[0064] Unlike the example in Fig. 12, the example in Fig. 13 is a method of eliminating the phase error of the differential output signal by correcting the phase of the differential output signal itself of the differential circuit.

[0065] That is, although the embodiments according to the present invention illustrated in FIG. 12 and FIG. 13 appear very similar in terms of circuit operation, there is a difference in that, in FIG. 12, the differential circuit is driven by a differential input signal with phase error removed, so as a result, a differential signal with phase error removed is output, whereas in FIG. 13, a differential input signal with phase error is input to the differential circuit, and the differential circuit is driven by such a differential input signal with phase error.

[0066] Figures 14 and 15 below show an application example where a phase error occurs in the differential circuit itself, considering the actual operation where the differential circuit is not ideal.

[0067] FIG. 14 is a diagram illustrating a case where a phase corrector is provided on one of the two output signal lines in a situation where the differential circuit is not ideal. As shown in FIG. 14, V IN1 and V IN2Even if input is received without this phase error, a phase error occurs in the differential output of the differential circuit due to distortion within the differential circuit itself. However, in this case, as shown in the method of FIG. 6, the phase is corrected by a phase corrector provided on the first output signal line, which is one of the two output signal lines, so that the phase error in the final differential output signal can be suppressed.

[0068] FIG. 15 is a diagram showing a case where a phase corrector is provided on one of the two input signal lines in a situation where the differential circuit is not ideal. In this case, the phase corrector can operate by predicting the phase error that will occur in the differential circuit and generating a phase error inversely equal to the phase error that will occur in the differential circuit, thereby suppressing the phase in the final differential output signal of the electronic circuit.

[0069] Consequently, even if the input differential input signal has no phase error, the phase corrector artificially generates a phase error in the differential input signal and inputs it to the differential circuit, and the phase error can be eliminated in the final differential output signal through the abnormal operation of the differential circuit.

[0070] As shown in FIG. 10 above, this is another embodiment according to the present invention, in which a phase corrector is provided on one of the input signal lines and one of the output signal lines of the differential circuit, respectively. The operating principle of the embodiment according to FIG. 10 can be easily interpreted by a person skilled in the art from the operating principle of the embodiment of the present invention described above.

[0071] In addition, embodiments according to the present invention shown in FIGS. 6, 8, 10, and FIGS. 12 to 15 illustrate a case in which a phase corrector is provided on one of the differential signal lines. If the phase corrector is assumed to be ideal, it can be assumed that there is no power loss in the phase corrector; however, in reality, power loss occurs in the phase corrector, and consequently, there is a problem in that the signal passing through the phase corrector has a distorted signal magnitude. That is, a differential signal can be considered an ideal differential signal only if there is no phase error due to a 180° phase difference, and the signal magnitudes between the differential signals are also identical.

[0072] However, even if the phase error is eliminated by the phase corrector, if the magnitudes of the differential signals are formed differently by the phase corrector, this also causes a decrease in the performance of the entire circuit. To suppress the magnitude error of the differential signal, instead of providing a phase corrector on only one of the differential signal lines, a phase corrector may be provided on each of the two differential signal lines constituting the differential signal. Examples of this are described in FIGS. 7, 9, and 11, and in this case, not only the phase error of the differential signal but also the magnitude error can be suppressed.

[0073] For the sake of convenience of understanding, the present invention has been described through embodiments applied to differential circuits; however, it can also be applied to general electronic circuits where phase correction is required for various reasons, even if the invention is not a differential circuit.

[0074] FIG. 16 is a diagram showing an embodiment in which a phase corrector according to the present invention is provided on an input signal line of a general single-ended electronic circuit, and FIG. 17 is a diagram showing an embodiment in which a phase corrector according to the present invention is provided on an output signal line of a general single-ended electronic circuit. FIG. 18 is a diagram showing an embodiment in which a phase corrector according to the present invention is provided on each of the input signal line and the output signal line of a general single-ended electronic circuit.

[0075] In this way, the phase corrector according to an embodiment of the present invention can be applied to one selected from the input signal line and the output signal line, or to both input and output signal lines, when phase correction is required in a single-ended electronic circuit.

[0076] FIGS. 19 to 21 are drawings showing examples of implementation of a phase corrector according to an embodiment of the present invention.

[0077] The phase corrector shown in FIG. 19 corrects the phase of a signal input through the first stage and outputs it through the second stage, and may have a structure in which an inductor (L) and a variable capacitor (C) are connected in parallel between the first stage and the second stage.

[0078] FIG. 19 shows a phase corrector in which an inductor (L) and a capacitor (C) are connected in parallel so that the phases of the input signal and the output signal can be changed when an AC signal is input to generate a phase difference. The capacitor can be implemented as a variable capacitor (Variable Capacitor: Varactor) so that the phase can be varied.

[0079] The phase corrector shown in FIG. 20 corrects the phase of a signal input through the first stage and outputs it through the second stage, and may have a structure in which a resistor (R) and a variable capacitor (C) are connected in parallel between the first stage and the second stage.

[0080] Figure 20 shows a phase corrector in which a resistor (R) and a capacitor (C) are connected in parallel so that the phases of the input signal and the output signal can be changed when an AC signal is input to generate a phase difference. The capacitor can be implemented as a variable capacitor (Variable Capacitor: Varactor) so that the phase can be varied.

[0081] Next, the phase corrector shown in FIG. 21 corrects the phase of a signal input through the first stage and outputs it through the second stage, and has a structure in which a transistor and a variable capacitor are connected in parallel between the first stage and the second stage, and a bias voltage can be applied to the gate of the transistor.

[0082] In FIG. 21, the transistor is described as a MOSFET for convenience of explanation, but it may include not only MOSFETs but also all transistors including BJTs, HEMTs, pHEMTs, MESFETs, and HBTs. Additionally, depending on the adjustment of the gate bias of the transistor in FIG. 21, the transistor can be operated as a resistor, and depending on the variation of the gate bias, it can be operated as a variable capacitor or a variable resistor to implement a phase corrector.

[0083] According to the present invention, a phase corrector is provided on a signal line where the removal of phase errors is required, thereby allowing for the removal or correction of phase errors that have already occurred due to various unpredictable reasons. Accordingly, the need to finely identify the cause of the phase error in advance is reduced, thereby enabling the effective suppression of phase errors in electronic circuits.

[0084] The present invention has been described with reference to embodiments illustrated in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of protection of the present invention should be determined by the technical spirit of the appended claims. Explanation of the symbols

[0085] 100, 200, 300: Differential amplifier 110, 210, 310: Differential amplifier 120,220,320: Phase corrector

Claims

Claim 1 A differential amplifier having a phase corrector, comprising: a differential amplifier that receives a differential signal input to an input terminal through first and second input signal lines, amplifies it, and outputs it to an output terminal through first and second output signal lines; and a differential amplifier comprising a phase corrector provided on one of the first and second output signal lines selected, which corrects the phase of an output signal introduced into the corresponding output signal line and provides it to an output terminal. Claim 2 In claim 1, the phase corrector is a differential amplifier device provided on each of the first and second output signal lines. Claim 3 A differential amplifier having a phase corrector, comprising: a differential amplifier that receives a differential signal input to an input terminal through first and second input signal lines, amplifies it, and outputs it to an output terminal through first and second output signal lines; and a differential amplifier comprising a phase corrector provided on one of the first and second input signal lines selected, which corrects the phase of an input signal introduced into the input signal line and applies it to the differential amplifier. Claim 4 In claim 3, the phase corrector is a differential amplifier device provided on each of the first and second input signal lines. Claim 5 A differential amplifier having a phase corrector, comprising: a differential amplifier that receives a differential signal input to an input terminal through first and second input signal lines, amplifies it, and outputs it to an output terminal through first and second output signal lines; a first phase corrector provided on one selected input signal line among the first and second input signal lines, correcting the phase of an input signal introduced into the input signal line and applying it to the differential amplifier; and a second phase corrector provided on one selected output signal line among the first and second output signal lines, correcting the phase of an output signal introduced into the output signal line and providing it to the output terminal. Claim 6 A differential amplifier device according to claim 5, wherein the first phase corrector and the second phase corrector are each provided on the first input signal line and the first output signal line, or provided on the second input signal line and the second output signal line. Claim 7 A differential amplifier device according to claim 5, wherein the first phase corrector is provided on each of the first and second input signal lines, and the second phase corrector is provided on each of the first and second output signal lines. Claim 8 A differential amplifier device according to any one of claims 1, 3, and 5, wherein the phase corrector corrects the phase of a signal input through a first stage and outputs it through a second stage, and has a structure in which a passive component and a variable capacitor are connected in parallel between the first stage and the second stage. Claim 9 A differential amplifier according to claim 8, wherein the passive element is an inductor or a resistor, and the variable capacitor is a varactor. Claim 10 A differential amplifier according to any one of claims 1, 3, and 5, wherein the phase corrector corrects the phase of a signal input through a first stage and outputs it through a second stage, and has a structure in which a transistor and a variable capacitor are connected in parallel between the first stage and the second stage, and a bias voltage is applied to the gate of the transistor.

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