Frequency conversion circuit

Abstract

The present invention provides a frequency conversion circuit. The frequency conversion circuit comprises: a differential unit, the differential unit comprising differential pair transistors which are symmetrically arranged, a control end of a differential pair transistor being used for inputting a differential input signal, an input end of the differential unit being connected to a power supply end, and an output end of the differential unit being connected to a current source; a shunt unit, the shunt unit being connected to the current source, an output current of the shunt unit and an output current of the differential unit being jointly controlled by the current source, and the output current of the shunt unit being negatively correlated with an outflow current of the differential unit; and a current acquisition unit, which is used for acquiring a current of the shunt unit and outputting to the input end of the differential unit an acquisition current corresponding to the current of the shunt unit. According to the present invention, by arranging a shunt unit and a current acquisition unit, a feedback mechanism for changes in an amplified signal of the differential unit is established, so that the amplitude is increased while frequency conversion is achieved.

Description

A frequency conversion circuit Technical Field

[0001] The present invention relates to the field of electronic circuit design, and in particular to a frequency conversion circuit. Background Art

[0002] In the field of electronics, frequency conversion is a common method for signal processing and energy conversion. For example, in telecommunications, signal reception involves down-conversion, while transmission involves up-conversion. In power grids, this involves frequency conversion between DC and AC, and between low-frequency and high-frequency AC.

[0003] Commonly used frequency conversion devices include frequency converters, frequency multipliers, frequency dividers, etc. Even detectors can be regarded as the conversion of RF signals to DC signals.

[0004] Existing frequency conversion circuits are designed to achieve frequency conversion, covering frequencies from DC to ultra-high frequencies. However, in some special application scenarios, there is a need to simultaneously convert the frequency and increase the amplitude. To this end, the present invention provides a new frequency conversion circuit to meet these application requirements.

[0005] Summary of the Invention

[0006] The following is a brief summary of one or more aspects to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceivable aspects and is neither intended to identify key or critical elements of all aspects nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that will be provided later.

[0007] According to one aspect of the present invention, a frequency conversion circuit is provided. The frequency conversion circuit includes: a differential unit, the differential unit including a symmetrically arranged differential pair of transistors, the control end of the differential pair of transistors being used to input a differential input signal, the current input end of the differential pair of transistors being short-circuited to form the input end of the differential unit, the current output end of the differential pair of transistors being short-circuited to form the output end of the differential unit, the input end of the differential unit being connected to a power supply end, and the output end of the differential unit being connected to a current source; a shunt unit, the shunt unit being connected to the current source, the output current of the shunt unit and the output current of the differential unit being jointly controlled by the current source, and the output current of the shunt unit being negatively correlated with the outflow current of the differential unit; and a current acquisition unit, for acquiring the current of the shunt unit and outputting the corresponding acquired current to the input end of the differential unit.

[0008] In one embodiment, the connection point between the current acquisition unit and the differential unit constitutes a confluence point, and an output unit is provided between the power supply end and the confluence point for converting the current signal of the confluence point into a target output signal of the frequency conversion circuit for output.

[0009] Furthermore, the output unit is a resistor, a first end of the resistor is connected to the power supply end, a second end of the resistor is connected to the bus bar, and a voltage at the second end of the resistor is the output signal of the frequency conversion circuit.

[0010] In another embodiment, the output unit is a matching circuit, which includes a first inductor, a second resistor and a first capacitor. The first inductor and the second resistor are connected in series between the power supply end and the bus point. The power supply end is grounded through the first capacitor. The output end of the frequency conversion circuit is set between the first inductor and the output end of the differential unit.

[0011] In yet another embodiment, the output unit is a current mirror, an input tube of the current mirror is connected in series between the power supply end and the confluence point, and the mirror current of the mirror tube serves as the output signal of the frequency conversion circuit.

[0012] In one embodiment, the current inflow end of the shunt unit is connected to a power supply end, the current outflow end of the shunt unit is connected to a current source, and the shunt unit is a variable resistor.

[0013] Furthermore, the variable resistor may be an active transistor.

[0014] In one embodiment, the shunt unit includes several transistors connected in parallel, the current inflow ends of the several transistors are short-circuited to form the input end of the shunt unit, the current outflow ends of the several transistors are short-circuited to form the output end of the shunt unit, the control ends of the several transistors are connected to a DC power supply end, the input end of the shunt unit is connected to the power supply end, the output end of the shunt unit is connected to the current source, the current collection unit is an electrical connection line, one end of the electrical connection line is connected to the input end of the differential unit to form a confluence point, and the other end of the electrical connection line is connected to the control end of the active transistor.

[0015] In another embodiment, the shunt unit includes several transistors connected in parallel, the current inflow ends of the several transistors are short-circuited to form the input end of the shunt unit, the current outflow ends of the several transistors are short-circuited to form the output end of the shunt unit, the control ends of the several transistors are connected to a DC power supply end, the input end of the shunt unit is connected to the power supply end, the output end of the shunt unit is connected to the current source, and the current collection unit collects the input end current or the output end current of the shunt unit and converts the input end current or the output end current into the collection current.

[0016] Preferably, the number of transistors is one or two.

[0017] In one embodiment, the input end of the shunt unit is connected to a power supply end, and the current collection unit collects the input current or output current of the shunt unit and converts the input current or output current into a collection current.

[0018] In another embodiment, the shunting unit is a resistor, and the resistor includes an active resistor.

[0019] In another embodiment, the shunt unit includes several transistors connected in parallel, the current inflow ends of the several transistors are short-circuited to form the input end of the shunt unit, the current outflow ends of the several transistors are short-circuited to form the output end of the shunt unit, the control ends of the several transistors are connected to a DC power supply end, the input end of the shunt unit is connected to the power supply end, and the output end of the shunt unit is connected to the current source.

[0020] Preferably, the number of transistors is one or two.

[0021] In any of the foregoing embodiments, the current acquisition unit is a current mirror, the input tube of the current mirror is connected in series between the input end and the power supply end of the shunt unit or between the output end and the current source, the mirror current of the current mirror constitutes the acquisition current, and the output end of the mirror tube of the current mirror is connected to the input end of the differential unit.

[0022] In any of the foregoing embodiments, the current acquisition unit is a transformer, the primary side of the transformer is connected in series between the input end and the power supply end of the shunt unit or between the output end and the current source, and the secondary side of the transformer is connected in series between the input end and the power supply end of the differential unit.

[0023] In any of the aforementioned embodiments, the current source includes one or more current sources connected in parallel.

[0024] The present invention establishes a feedback mechanism for changes in the amplified signal of the differential unit by arranging the shunt unit and the current collection unit, thereby achieving an increase in amplitude while realizing frequency conversion. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above features and advantages of the present invention will be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings.

[0026] FIG1 is a schematic block diagram of a frequency conversion circuit according to an embodiment of the present invention;

[0027] FIG2 is a circuit diagram of a frequency conversion circuit according to an embodiment of the present invention;

[0028] 3 is a circuit diagram of a frequency conversion circuit according to an embodiment of the present invention;

[0029] FIG4 is a schematic block diagram of a frequency conversion circuit in another embodiment according to one aspect of the present invention;

[0030] 5 is a circuit diagram of a frequency conversion circuit according to an embodiment of the present invention;

[0031] FIG6 is a circuit diagram of a frequency conversion circuit according to an embodiment of the present invention;

[0032] 7 is a circuit diagram of a frequency conversion circuit according to an embodiment of the present invention;

[0033] FIG. 8 is a circuit diagram of a frequency conversion circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following description is provided to enable those skilled in the art to make and use the present invention and to incorporate it into a specific application context. Various modifications and uses in different applications will be readily apparent to those skilled in the art, and the general principles defined herein are applicable to a wide range of embodiments. Thus, the present invention is not limited to the embodiments set forth herein, but should be accorded the broadest scope consistent with the principles and novel features disclosed herein.

[0035] In the following detailed description, many specific details are set forth to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the practice of the present invention need not be limited to these specific details. In other words, known structures and devices are shown in block diagram form without detailed display to avoid obscuring the present invention.

[0036] Unless expressly stated otherwise, all features disclosed in this specification (including any accompanying claims, abstract, and drawings) may be replaced by alternative features serving the same, equivalent, or similar purpose. Therefore, unless expressly stated otherwise, each feature disclosed is only an example of a group of equivalent or similar features.

[0037] Note that the terms "first" and "second", where used, are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected," "connect," and "crossover" should be understood as referring to electrical connections, which may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention.

[0039] Note that, where used, "further," "preferably," "further," and "more preferably" are simply prefaces for describing another embodiment based on the preceding embodiment. The contents of the "further," "preferably," "further," or "more preferably" combined with the preceding embodiment constitute a complete configuration of another embodiment. Multiple "further," "preferably," "more preferably," or "more preferably" clauses appended to the same embodiment can be arbitrarily combined to form yet another embodiment.

[0040] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Note that the various aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention.

[0041] According to one aspect of the present invention, a frequency conversion circuit is provided for increasing the amplitude of an output signal while performing frequency conversion.

[0042] FIG1 shows a block diagram of a frequency conversion circuit according to an embodiment of the present invention. As shown in FIG1 , the frequency conversion circuit includes a differential unit 1 , a current shunting unit 2 , a current acquisition unit 3 and a current source I.

[0043] Differential unit 1 is the amplification unit primarily responsible for frequency conversion and includes a symmetrically arranged differential pair of transistors Q1 and Q2. The control terminals of the differential pair are used to receive the differential input signals Rfin+ and Rfin-. The current input terminals of the differential pair of transistors Q1 and Q2 are short-circuited to form the input of differential unit 1, while the current output terminals of the differential pair of transistors Q1 and Q2 are short-circuited to form the output of differential unit 1. The input of differential unit 1 is connected to the power supply, while the output of differential unit 1 is connected to the current source I.

[0044] The differential pair of transistors Q1 and Q2 can be bipolar transistors or field-effect transistors. The control terminals of the differential pair of transistors Q1 and Q2 refer to the base of the bipolar transistor or the gate of the field-effect transistor. The current inflow terminals refer to the collector of the N-type bipolar transistor, the emitter of the P-type bipolar transistor, the drain of the M-type field-effect transistor, or the source of the P-type field-effect transistor. The current outflow terminals refer to the emitter of the N-type bipolar transistor, the collector of the P-type bipolar transistor, the source of the M-type field-effect transistor, or the drain of the P-type field-effect transistor. Regarding the input and output of the frequency amplifier circuit, the input signal of the frequency amplifier circuit is introduced from the control terminals of the differential pair of transistors Q1 and Q2, and the output signal of the frequency amplifier circuit is drawn from the current inflow terminals of the differential pair of transistors Q1 and Q2.

[0045] The shunt unit 2 and the differential unit 1 are both connected to the current source I. Therefore, the output current of the shunt unit 2 and the output current of the differential unit 1 are both controlled by the current source I. When the output current of the differential unit 1 changes with the transformation of its input signal, the current of the current source I remains unchanged. Obviously, the output current of the shunt unit 2 will change inversely with the output current of the differential unit 1, that is, the output current of the shunt unit 2 is negatively correlated with the output current of the differential unit 1.

[0046] The current collection unit 3 is used to collect the current of the shunt unit 2 and output the collected current corresponding to the current of the shunt unit 2 to the input end of the differential unit 1 .

[0047] That is, the shunt unit 2 can generate a certain response according to the change of the input signal of the differential unit. The response is collected by the current acquisition unit 3 and the collected current is output to the current inflow end of the differential unit 1. The output end of the frequency conversion circuit is generally set at the current inflow end of the differential unit 1. Therefore, the shunt unit 2 and the current acquisition unit 3 can be regarded as an input-to-output feedback compensation structure of a frequency conversion circuit.

[0048] It can be understood that the differential unit 1 itself can form an input-to-output response, and the combination of the shunt unit 2 and the current acquisition unit 3 can form an input-to-output feedback compensation structure. It can be seen that the input to output of the frequency conversion circuit has two response branches. Therefore, on the basis of frequency conversion, the superposition of the two response branches can also increase the amplitude.

[0049] The current collected by the current collection unit 3 is proportional to the input current or output current of the shunt unit 2. Preferably, the ratio of the current collected to the input current or output current of the shunt unit 2 is greater than or equal to 1.

[0050] Although FIG1 does not show the specific circuit structure of the shunt unit 2 and the current acquisition unit 3, those skilled in the art may respectively adopt existing or future circuits for realizing the shunt function, the current acquisition function, or a circuit for the feedback compensation function of their combination to realize them according to the individual functions or the combined functions of the shunt unit 2 and the current acquisition unit 3.

[0051] For example, the shunting unit 2 can be implemented by using one or more conventional resistors, variable resistors, or a combination thereof, wherein the variable resistors include manually adjustable resistors (such as slice resistors) or active resistors.

[0052] The current acquisition unit 3 can be implemented by using a common Hall current sensor or other device for current acquisition, or it can be implemented by referring to the transformer principle and utilizing the mechanism that the secondary current changes with the primary current, or it can be implemented by using a circuit structure in which the output is in a certain proportion to the input and the current direction can be changed (such as a current mirror).

[0053] FIG2 shows a schematic diagram of a frequency conversion circuit in a specific embodiment. In which the shunt unit 2 adopts an adjustable resistor R F To achieve this, the current acquisition unit 3 is implemented by using a current mirror.

[0054] As shown in FIG2 , the current acquisition unit 3 includes an input tube PM1 and a mirror tube PM2 , wherein the input tube PM1 is connected in series to an adjustable resistor R F and its power supply end, the output end of the mirror tube PM2 is connected to the current inflow end of the differential unit 1.

[0055] Those skilled in the art will appreciate that a current mirror is a common current source circuit, and its connection method is a necessary condition for it to generate a mirror current. Therefore, it will not be described in detail. Reference may be made to the current mirror 3 shown in FIG2 . The current mirror using the connection method shown in FIG2 uses a P-type MOS transistor or a transistor.

[0056] Fig. 3 shows a schematic circuit diagram of a frequency conversion circuit in another specific embodiment, wherein the current shunting unit 2 is implemented by an active resistor Q3, and the current acquisition unit 3 is implemented by a transformer.

[0057] As shown in FIG3 , the current acquisition unit 3 includes a primary side L1 and a secondary side L2, wherein the primary side L1 is connected in series between the current inflow end of the active resistor Q3 and its power supply end, and the secondary side L2 is connected in series between the current inflow end of the differential unit 1 and the power supply end of the differential unit 1. The current outflow end of the active resistor Q3 is connected to the current source I, and the control end of the active resistor Q3 is a port for controlling the size of its resistance, which can be the gate of a field effect transistor or the base of a transistor. In the frequency conversion circuit shown in FIG3 , the connection point between the secondary side L2 of the transformer 3 and the input end of the differential unit 1 can serve as the output end P of the frequency conversion circuit. out .

[0058] In the frequency conversion circuit shown in Figure 2 or Figure 3, the shunt unit 2 can be composed of a plurality of adjustable resistors. The shunt unit 2 in Figure 2 can adopt a structure in which a plurality of adjustable resistors are connected in parallel, and the shunt unit 2 in Figure 3 can adopt a structure in which a plurality of active resistors are connected in parallel. The current inflow ends of the plurality of active resistors connected in parallel are short-circuited to form the input end of the shunt unit 2, the current outflow ends of the plurality of active resistors connected in parallel are short-circuited to form the output end of the shunt unit 2, and the control ends of the plurality of active resistors connected in parallel are short-circuited to form the control end of the shunt unit 2. The control voltage of the control end can control the parallel resistance value of the plurality of active resistors. In order to reduce losses, preferably, the plurality of resistors connected in parallel can be one or two. Preferably, the control voltage of the control end is equal to the amplitude or equivalent voltage of the differential input signal of the differential unit 1.

[0059] In the frequency conversion circuit shown in FIG2 or FIG3, the current acquisition unit 3 can be set at the input end or input end of the shunt unit 2, that is, the input tube PM1 shown in FIG2 can also be set at the variable resistor R F The primary side L1 shown in FIG3 may also be provided between the current outflow end of the active transistor Q3 and the current source I. As shown in FIG3 , the primary side L1 shown in FIG3 may also be provided between the current outflow end of the active transistor Q3 and the current source I.

[0060] In the embodiment shown in Figure 1 , the current at the input of the differential unit 1 can serve as the output signal of the frequency conversion circuit. As shown in Figure 1 , the connection point between the current acquisition unit 3 and the differential unit 1 can form a current confluence point A, and the current signal at confluence point A can serve as the output signal.

[0061] Those skilled in the art will appreciate that when the output signal of the frequency conversion circuit needs to be a voltage signal, an output unit may be further provided at the confluence point shown in FIG. 1 to convert the current signal into a voltage signal for output.

[0062] Figure 4 shows a schematic diagram of the frequency conversion circuit architecture in one embodiment. In the embodiment shown in Figure 4 , an output unit 4 is further provided at the connection point between the current acquisition unit 3 and the differential unit 1. Output unit 4 can be implemented using a resistor or an active resistor; in some embodiments, output unit 4 can also utilize a current mirror to isolate the output signal. In current mirror embodiments, preferably, the output end of the mirror tube of the current mirror can also utilize a series resistor to convert the mirror current into a mirror voltage.

[0063] In some embodiments, when the output end of the frequency conversion circuit is matched with its load, the output unit 4 may also be a matching circuit that achieves impedance matching with the load circuit.

[0064] Figure 5 shows a schematic diagram of a frequency conversion circuit. The embodiment shown in Figure 5 differs from the embodiment shown in Figure 2 in that output unit 4 comprises resistor R1. A first end of resistor R1 is connected to power supply terminal VDD, and a second end is connected to bus point A. The second end of resistor R1 serves as the output terminal Pout of the frequency conversion circuit.

[0065] FIG6 shows a schematic diagram of a frequency conversion circuit. The difference between the embodiment shown in FIG5 and the embodiment shown in FIG2 is that the adjustable resistor R F Active transistor Q3 is used for implementation, and output unit 4 adopts a matching circuit to achieve output matching of the frequency conversion circuit.

[0066] It can be understood that the matching circuit can be implemented by a circuit that meets the matching requirements of the output load of the frequency conversion circuit. For example, the matching circuit is a circuit that can achieve conjugate matching between the output impedance of the frequency conversion circuit and its output load impedance.

[0067] Taking the matching circuit 4 shown in Figure 6 as an example, the matching circuit may include an inductor L3, a resistor R1, and a capacitor C1. The inductor L3 and the resistor R1 are connected in series between the power supply terminal VDD and the input terminal of the differential unit 1. One end of the capacitor C1 is connected between the power supply terminal VDD and the inductor L3, and the other end of the capacitor C1 is grounded. The output terminal Pout of the frequency conversion circuit can be set at any point between the inductor L3 and the input terminal of the differential unit.

[0068] FIG7 shows a schematic diagram of a frequency conversion circuit. The embodiment shown in FIG7 differs from the embodiment shown in FIG5 in that: the adjustable resistor R F This is achieved using an active transistor Q3; the current collection unit is implemented using an electrical connection line. Specifically, the control terminal of the active transistor Q3 is connected to the confluence point A, and the connection line from the control terminal of the active transistor Q3 to the confluence point A constitutes the current collection unit. In this case, the output terminal Pout of the frequency conversion circuit can be located between the resistor R1 and the confluence point A.

[0069] FIG8 is a circuit diagram of a frequency conversion circuit. The difference between the embodiment shown in FIG8 and the embodiment shown in FIG7 is that the output terminal Pout of the frequency conversion circuit is arranged between the shunt unit 2 and the current source I.

[0070] The output end of the frequency conversion circuit mentioned in the present invention does not refer to a port in a narrow sense, but refers to the extraction point of the output signal of the frequency conversion circuit. The extraction point can be used as an output port, or the signal of the output end can be extracted through other required output circuits.

[0071] Furthermore, in any of the aforementioned embodiments, the current source I may be a single current source, or may be composed of multiple current sources connected in parallel.

[0072] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. However, it should be understood that the scope of protection of the present invention is subject to the appended claims and is not limited to the specific structures and components of the above-illustrated embodiments. Those skilled in the art may make various changes and modifications to the various embodiments within the spirit and scope of the present invention, and such changes and modifications are also within the scope of protection of the present invention.

Claims

1. A frequency conversion circuit, characterized in that: include: A differential unit, the differential unit comprising a symmetrically arranged differential pair of tubes, the control end of the differential pair of tubes being used to input a differential input signal, the current input end of the differential pair of tubes being short-circuited to form the input end of the differential unit, the current output end of the differential pair of tubes being short-circuited to form the output end of the differential unit, the input end of the differential unit being connected to a power supply end, and the output end of the differential unit being connected to a current source; A shunt unit, wherein the shunt unit is connected to the current source, an output current of the shunt unit and an output current of the differential unit are controlled by the current source, and the output current of the shunt unit is negatively correlated with an outflow current of the differential unit; as well as The current collection unit is used to collect the current of the shunt unit and output the corresponding collected current to the input end of the differential unit.

2. The frequency conversion circuit according to claim 1, wherein: The connection point between the current acquisition unit and the differential unit constitutes a confluence point, and an output unit is provided between the power supply end and the confluence point for converting the current signal of the confluence point into a target output signal of the frequency conversion circuit for output.

3. The frequency conversion circuit according to claim 2, characterized in that: The output unit is a resistor, a first end of the resistor is connected to the power supply end, a second end of the resistor is connected to the confluence point, and a voltage at the second end of the resistor is an output signal of the frequency conversion circuit.

4. The frequency conversion circuit according to claim 2, characterized in that: The output unit is a matching circuit, which includes a first inductor, a second resistor and a first capacitor. The first inductor and the second resistor are connected in series between the power supply end and the confluence point. The power supply end is grounded through the first capacitor. The output end of the frequency conversion circuit is arranged between the first inductor and the output end of the differential unit.

5. The frequency conversion circuit according to claim 2, characterized in that: The output unit is a current mirror, an input tube of the current mirror is connected in series between the power supply end and the confluence point, and a mirror current of the mirror tube of the current mirror serves as an output signal of the frequency conversion circuit.

6. The frequency conversion circuit according to claim 1, wherein: The current inflow end of the shunt unit is connected to a power supply end, the current outflow end of the shunt unit is connected to the current source, and the shunt unit is a variable resistor.

7. The frequency conversion circuit according to claim 6, characterized in that: The variable resistor is an active transistor.

8. The frequency conversion circuit according to claim 7, characterized in that: The shunt unit includes a plurality of transistors connected in parallel, the current inflow ends of the plurality of transistors are short-circuited to form the input end of the shunt unit, the current outflow ends of the plurality of transistors are short-circuited to form the output end of the shunt unit, the control ends of the plurality of transistors are connected to a DC power supply end, the input end of the shunt unit is connected to the power supply end, the output end of the shunt unit is connected to the current source, the current collection unit is an electrical connection line, one end of the electrical connection line is connected to the input end of the differential unit to form a confluence point, and the other end of the electrical connection line is connected to the control end of the active transistor.

9. The frequency conversion circuit according to claim 8, characterized in that: The output end of the frequency conversion circuit is arranged at the confluence point or the output end of the shunt unit.

10. The frequency conversion circuit according to claim 7, characterized in that: The shunt unit includes a plurality of transistors connected in parallel, the current inflow ends of the plurality of transistors are short-circuited to form the input end of the shunt unit, the current outflow ends of the plurality of transistors are short-circuited to form the output end of the shunt unit, the control ends of the plurality of transistors are connected to a DC power supply end, the input end of the shunt unit is connected to the power supply end, the output end of the shunt unit is connected to the current source, and the current collection unit collects the input end current or the output end current of the shunt unit and converts the input end current or the output end current into the collection current.

11. The frequency conversion circuit according to claim 10, characterized in that: The number of transistors is one or two.

12. The frequency conversion circuit according to any one of claims 1 to 7 or 10 to 11, characterized in that: The current collection unit is a current mirror, the input tube of the current mirror is connected in series between the input end and the power supply end of the shunt unit or between the output end and the current source, the mirror current of the current mirror constitutes the collection current, and the output end of the mirror tube of the current mirror is connected to the input end of the differential unit.

13. The frequency conversion circuit according to any one of claims 1 to 7 or 10 to 11, characterized in that: The current collection unit is a transformer, the primary side of the transformer is connected in series between the input end and the power supply end of the shunt unit or between the output end and the current source, and the secondary side of the transformer is connected in series between the input end and the power supply end of the differential unit.

14. The frequency conversion circuit according to any one of claims 1 to 11, characterized in that: The current source includes one or more current sources connected in parallel.

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