A differential derivative structure circuit and amplifier based on three-coupled transformers

Abstract

The application discloses a differential derivative structure circuit and an amplifier based on three-coupling voltage transformation, and relates to the technical field of amplifier circuit design.The differential derivative structure circuit comprises a three-coupling inductive network and N output parts.The main amplifier tube and the auxiliary amplifier tube in the differential derivative structure composed of MOS tubes in parallel are integrated into the inductive matching network in the mode of three-coupling voltage transformation, not only realizing the homologous coupling of the main amplifier tube and the auxiliary amplifier tube on the radio frequency signal path, but also realizing the physical isolation and independent bias control on the direct current path, so that the use of resistance is not needed, the overuse of capacitance is avoided, the loss caused by the impedance of the capacitance itself and the loss of the parasitic capacitance to the ground are reduced, the gain is greatly improved, the additional area occupied by the capacitance and resistance is effectively inhibited, and the thermal noise introduced by the resistance is eliminated by the low-impedance characteristic of inductive coupling, so that the noise of the latter stage is effectively inhibited, and the noise coefficient is reduced.

Description

Technical Field

[0001] This invention relates to the field of amplifier circuit design technology, and more specifically, to: 1. a differential derivative structure circuit based on a three-coupling transformer; 2. an amplifier constructed using this differential derivative structure circuit. Background Technology

[0002] Differential derivative structure circuits are commonly used in amplifiers. They typically consist of two MOS transistors biased in different regions connected in parallel, and their third derivatives of gain cancel each other out due to their opposite signs, in order to achieve a gain flatness with a larger signal amplitude.

[0003] The differential derivative structure circuit employs a multi-bias scheme. See [link / reference] Figure 1 It demonstrates the design of an existing differential derivative structure circuit—used to convert the input signal VIN + VIN - Gain amplifier layer output signal VOUT + VOUT - Several large capacitors (i.e., Figure 1 C1 in + C2 + C1 - C2 - ), several large resistors (i.e. Figure 1 R1 in + R2 + R1 - R2 - This method uses a DC voltage source. However, this approach has the following problems:

[0004] 1. It will cause a significant decrease in gain. Because a large capacitor is connected in series in the AC signal path, the large capacitor itself has a certain impedance and a large parasitic capacitance to ground. This will lead to the deterioration of the inductor matching network and the decrease in gain; moreover, some signal flows into AC ground through the large resistor, resulting in a waste of signal energy.

[0005] 2. It will occupy additional space. To reduce losses, huge bias capacitors and bias resistors are needed, and differential structures mean that twice the number of capacitors and resistors are required, which will significantly increase the circuit area and increase hardware costs.

[0006] 3. It will cause a deterioration in the noise figure. The bias voltage is connected to the gate of the MOSFET through a large resistor. Although the resistance value of the large resistor is usually very large, the thermal noise generated by it will still be coupled into the signal path through the gate, increasing the noise floor. Summary of the Invention

[0007] Therefore, it is necessary to address the problems of significant gain reduction, additional area occupation, and deterioration of noise figure caused by the use of large capacitors and large resistors in existing differential derivative structure circuits, and to provide a differential derivative structure circuit and amplifier based on a three-coupling transformer.

[0008] This invention is achieved using the following technical solution:

[0009] In a first aspect, the present invention provides a differential derivative structure circuit based on a three-coupled transformer, which includes: a three-coupled inductor network and N output units.

[0010] The three-coupled inductor network includes three mutually inductive inductors L1 to L3. The nth output section includes two positive output capacitors C. 2,n + ~C 3,n + 2 positive output MOSFETs M 1,n + ~M 2,n + 2 negative output capacitors C 2,n - ~C 3,n - 2 negative output MOSFETs M 1,n - ~M 2,n - ;n∈[1,N].

[0011] L1 is connected to the positive input signal VIN at both ends. + Negative input signal VIN - M 1,n + M 2,n + They are connected in parallel to form a differential derivative structure, and their grounding terminal is grounded; M 1,n - M 2,n - The L2 is connected in parallel to form a differential derivative structure II, and its grounding terminal is grounded; one end of L2 is connected to M. 1,n + gate, C 3,n + The upper electrode plate, the other end is connected to M 1,n - gate, C 3,n - The upper electrode plate; one end of L3 is connected to M. 2,n + gate, C 2,n + The upper electrode plate, the other end is connected to M 2,n - gate, C2,n - The upper electrode plate; C 3,n + The lower electrode is connected to the output terminal of the differential derivative structure II, C 2,n + The lower electrode is used to output the negative output signal VOUT. n - C 3,n - The lower electrode is connected to the output terminal of the differential derivative structure, C. 2,n - The lower electrode plate is used to output the positive output signal VOUT. n + The center tap of L2 is connected to a fixed bias voltage Vb1 to drive M, which acts as the main amplifier transistor. 1,n + M 1,n - Operating in the saturation region; the center tap of L3 is connected to an adjustable bias voltage Vb2 to drive M, which acts as an auxiliary amplifier transistor. 2,n + M 2,n - Working in a weakly reactive zone.

[0012] The implementation of this differential derivative structure circuit based on a three-coupled transformer is carried out according to the method or process of an embodiment of the present disclosure.

[0013] Secondly, the present invention discloses an amplifier that employs a differential derivative structure circuit based on a three-coupled transformer as disclosed in the first aspect.

[0014] Such an amplifier is implemented according to the method or process of an embodiment of this disclosure.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This invention integrates the power supply of the main and auxiliary amplifier transistors in the differential derivative structure composed of parallel MOS transistors into the inductor matching network through a three-coupling transformer. This not only achieves co-current coupling between the main and auxiliary amplifier transistors on the RF signal path, but also achieves physical isolation and independent bias control on the DC path. This eliminates the need for resistors and avoids excessive use of capacitors, reducing losses caused by capacitor impedance and parasitic capacitance to ground, significantly improving gain, effectively suppressing the extra area occupied by capacitors and resistors, and utilizing the low impedance characteristic of inductor coupling to eliminate thermal noise introduced by resistors, thereby effectively suppressing subsequent stage noise and reducing the noise figure.

[0017] 2. This invention improves the traditional dual-winding inductor into a three-coupled inductor; wherein, the primary winding remains responsible for receiving the RF input signal; the first secondary winding is dedicated to driving the main amplifier path in the differential derivative structure, and a fixed bias voltage is fed through its center tap to ensure that the main amplifier operates in the saturation region to provide stable gain; the second secondary winding is dedicated to driving the auxiliary amplifier path in the differential derivative structure, and an adjustable bias voltage is fed through its center tap to ensure that the auxiliary amplifier operates in the weak inversion region to provide a gain consistent with VIN. + VIN - Gain that is positively correlated with power level.

[0018] 3. This invention utilizes a triple-coupled inductor to achieve power division, which can effectively control the area of ​​the circuit to meet different requirements for the number of output signal groups. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 The circuit diagram is for the existing differential derivative structure circuit mentioned in the background art;

[0021] Figure 2 This is an architecture diagram of the differential derivative structure circuit based on a three-coupled transformer provided in Embodiment 1 of the present invention;

[0022] Figure 3 The circuit diagram of the differential derivative structure circuit based on a three-coupled transformer provided in Embodiment 1 of the present invention;

[0023] Figure 4 The circuit diagram of the amplifier constructed using this differential derivative structure circuit is provided for Embodiment 2 of the present invention. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that when a component is said to be "installed on" another component, it can be directly on the other component or it may be in a component that is centered on it. When a component is said to be "set on" another component, it can be directly set on the other component or it may also be in a component that is centered on it. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or it may also be in a component that is centered on it.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] As mentioned in the background section, Figure 1 Existing differential derivative circuits suffer from problems such as significant gain reduction, additional area occupation, and deterioration of noise figure due to the use of large capacitors and large resistors.

[0028] According to the inventor's analysis: Figure 1 In the middle, only one side winding is supplied to the main amplifier tube (i.e., M1). ＋ M1 - ) and auxiliary amplifier tube (i.e., M2) ＋ M2 - The main amplifier tube and the auxiliary amplifier tube provide an AC signal, but their DC biases are different—if there is no large capacitor (i.e., C1) + C2 + C1 - C2 - If the two MOSFETs have different DC biases, they will be directly connected together, making it impossible to determine the specific DC voltage; if there is no large resistor (i.e., R1) + R2 + R1 - R2 - If the AC signal is directly connected to ground via DC bias, it cannot be amplified by the MOSFET. Therefore, existing differential derivative structure circuits suffer from the drawback of the gate voltages of the two MOSFETs being mutually constrained and difficult to adjust precisely, leading to the overuse of capacitors and resistors.

[0029] Based on this analysis, the present invention provides a differential derivative structure circuit and amplifier based on a three-coupled transformer.

[0030] Example 1

[0031] See Figure 2This demonstrates the differential derivative structure circuit based on a three-coupled transformer provided in Embodiment 1, which can be divided into functional regions including: a three-coupled inductor network and N output sections.

[0032] 1. The three-coupled inductor network includes three mutually inducting inductors L1 to L3.

[0033] like Figure 2 As shown, the mutual inductance coefficient between L1 and L2 is K1; the mutual inductance coefficient between L1 and L3 is K2. In fact, L1~L3 form a three-winding transformer—including: one primary winding (i.e., L1) and two independent secondary windings (i.e., L2 and L3).

[0034] For L1, its two ends are connected to the positive input signal VIN respectively. + Negative input signal VIN - Among them, VIN + VIN - It is a differential signal, i.e., VIN + =-VIN - .

[0035] Of course, to ensure the normal operation of L1, the center tap of L1 needs to be connected to the drive voltage VA to drive L1 to work. Generally, VA is selected as the power supply VDD to provide sufficient voltage.

[0036] For L2, its two ends are the two ports that are connected in parallel by N outputs, and the center tap is connected to a fixed bias voltage Vb1. Generally, the value of Vb1 can be selected from: 0.3V≤Vb1≤0.5V.

[0037] For L3, its two ends are connected to two other ports that are connected in parallel to the N outputs, and the center tap is connected to an adjustable bias voltage Vb2. The adjustment range of Vb2 is: 0≤Vb2≤0.4V.

[0038] It should be noted that, although Figure 2 L1 to L3 are distributed on the left and right sides, but in actual layout processing, the three can be stacked – still only occupying the area of ​​one inductor, making it almost the same size as a regular transformer.

[0039] 2. As mentioned above, the N outputs are connected in parallel, and they are further amplified based on the two outputs of L2 and L3 to produce N amplified differential outputs.

[0040] For example, N=1 means a basic differential output; N=2 means two differential outputs required for a zero-IF architecture; of course, N can also take other values ​​to adapt to different modulation requirements.

[0041] See Figure 3 Taking the nth output section as an example, it includes: 2 positive output capacitors C 2,n + ~C 3,n + 2 positive output MOSFETs M 1,n + ~M 2,n + 2 negative output capacitors C 2,n - ~C 3,n - 2 negative output MOSFETs M 1,n - ~M 2,n - ;n∈[1,N].

[0042] M 1,n + M 2,n + They are connected in parallel to form a differential derivative structure, and their grounding terminal is grounded;

[0043] M 1,n - M 2,n - They are connected in parallel to form a differential derivative structure II, and their grounding terminals are grounded.

[0044] It should be noted that M 1,n + M 1,n - As the main amplifying tube; M 2,n + M 2,n - As an auxiliary amplifying tube.

[0045] M 1,n + M 2,n + It can be an NMOS transistor or a PMOS transistor. Similarly, M 1,n - M 2,n - It can be an NMOS transistor or a PMOS transistor.

[0046] Therefore, we have:

[0047] If M 1,n + M 2,n + If it is an NMOS transistor, then M 1,n + The source connection M 2,n+ The source of M is used as the ground terminal of the differential derivative structure; 1,n + Drain connection M 2,n + The drain is used as the output terminal of the differential derivative structure;

[0048] If M 1,n + M 2,n + If it is a PMOS transistor, then M 1,n + Drain connection M 2,n + The drain of M serves as the ground terminal of the differential derivative structure. 1,n + The source connection M 2,n + The source is used as the output terminal of the differential derivative structure;

[0049] If M 1,n - M 2,n - If it is an NMOS transistor, then M 1,n - The source connection M 2,n - The source of M is used as the ground terminal of the differential derivative structure 2; 1,n - Drain connection M 2,n - The drain is used as the output terminal of the differential derivative structure 2;

[0050] If M 1,n - M 2,n - If it is a PMOS transistor, then M 1,n - Drain connection M 2,n - The drain of M serves as the ground terminal of the differential derivative structure 2; 1,n - The source connection M 2,n - The source is used as the output terminal of the differential derivative structure 2.

[0051] One end of L2 is connected to M 1,n + gate, C 3,n + The upper electrode plate, the other end is connected to M 1,n - gate, C 3,n- The upper electrode plate; one end of L3 is connected to M. 2,n + gate, C 2,n + The upper electrode plate, the other end is connected to M 2,n - gate, C 2,n - The upper electrode plate. Referring to the above description, the center tap of L2 is connected to Vb1 to drive M. 1,n + M 1,n - Operating in the saturation region provides stable gain; the center tap of L3 is connected to Vb2 to drive M. 2,n + M 2,n - Operating in the weakly reactive region provides a connection with VIN. + VIN - The gain is positively correlated with the power level. This allocation mechanism also ensures the stability of the signal gain process.

[0052] C 3,n + The lower electrode is connected to the output terminal of the differential derivative structure II, C 2,n + The lower electrode is used to output the negative output signal VOUT. n - C 3,n - The lower electrode is connected to the output terminal of the differential derivative structure, C. 2,n - The lower electrode plate is used to output the positive output signal VOUT. n + .

[0053] Among them, VOUT n + VOUT n - That is, it serves as the nth differential output. In other words, VOUT n + VOUT n - It is a differential signal; VOUT n + =A1×VIN + VOUT n - =A1×VIN - A1 represents the power gain of the differential derivative structure circuit based on the three-coupling transformer.

[0054] Therefore, based on the above circuit structure, we can conclude that:

[0055] The triple-coupled inductor network simultaneously performs four functions: power divider (providing multiple differential output connection ports), input impedance matching (i.e., extremely low DC resistance of the windings), DC bias feed (i.e., DC level is introduced through the center taps of L2 and L3), and signal power distribution between the main amplifier and the auxiliary amplifier (i.e., achieving stable gain for the main amplifier through L2 and achieving a gain for the auxiliary amplifier that is positively correlated with the magnitude of the input signal power through L3). This reduces the area occupied by on-chip DC blocking capacitors and bias resistors.

[0056] The output section, combined with the above design, achieves complete DC isolation between the main amplifier tube path and the auxiliary amplifier tube path, eliminating the physical connection between the two DC biases—meaning there is no need to set up a large capacitor for isolation. On the other hand, the two DC biases are directly connected to the center taps of L2 and L3 (equivalent to virtual AC ground), which will not affect the AC signal—meaning there is no need to set up a large resistor to ensure the amplification effect. Moreover, by utilizing the extremely small DC resistance of the winding, the thermal noise generated by the resistor can be eliminated, significantly reducing the noise figure.

[0057] Taking N=1 as an example, the differential derivative structure circuit based on a three-coupled transformer provided in Embodiment 1 is compared to... Figure 1 The traditional differential derivative structure circuit only adds one inductor (the area of ​​which can be controlled by the stacked structure of the layout), but saves two capacitors and four resistors, resulting in significant area savings. As N increases, this area-saving advantage becomes even more pronounced.

[0058] Example 2

[0059] See Figure 4 This demonstrates an amplifier provided in Embodiment 2, which is a low-noise amplifier (LNA) and uses the differential derivative structure circuit based on a three-coupled transformer provided in Embodiment 1.

[0060] Specifically, such as Figure 4 As shown, the amplifier can be divided into functional areas including: a preamplifier section, a differential amplifier section, a bias generation section, and N postamplifier sections.

[0061] 1. The preamplifier is used to: convert the positive input signal IN into a signal that is not properly amplified. + Negative input signal IN - Enlarged to VIN + VIN - .

[0062] It is important to note that IN + IN - It is a differential signal, i.e., IN+ =-IN - .

[0063] VIN + VIN - It is also a differential signal; VIN + =A0×IN + VIN - =A0×IN - A0 represents the power gain of the preamplifier section.

[0064] In this embodiment 2, the preamplifier section can be designed to include: 3 inductors LA1~LA3, 2 NMOS transistors M1~M2, and 2 capacitors C1~C2.

[0065] LA1 is connected to IN at both ends. + IN - The center tap of LA2 is connected to Vb; one end of LA2 is connected to the gate of M1 and the upper plate of C1, and the other end is connected to the gate of M2 and the upper plate of C2; the center tap of LA3 is grounded; one end of LA3 is connected to the source of M1, and the other end is connected to the source of M2; the drain of M1 is connected to the lower plate of C2 and is used to output VIN. + The drain of M2 is connected to the lower plate of C1 and is used to output VIN. - .

[0066] Of course, M1~M2 can also be replaced with PMOS transistors, but the connection of the source and drain as described above needs to be reversed.

[0067] 2. The differential amplification section is the differential derivative structure circuit based on the three-coupled transformer provided in Example 1, which will not be described again here.

[0068] 3. The bias generation unit includes: an analog-to-digital converter (DAC); the input terminal of the DAC is connected to the reference voltage Vb, the control terminal is connected to the control signal vctrl, and the output terminal is used to output Vb1.

[0069] The DAC uses vctrl to finely adjust Vb1 within the range of 0V to 0.4V, enabling the circuit to dynamically find the optimal bias point of the differential derivative structure in response to different process deviations, temperature fluctuations, or frequency changes.

[0070] 4. There is a one-to-one correspondence between the N post-amplifier sections and the N output sections of the differential amplifier section. Therefore, taking the nth post-amplifier as an example, it is used to: convert VOUT... n + VOUT n - Amplified into a positive output signal OUT n + Negative output signal OUTn - .

[0071] OUT n + OUT n - It is a differential signal; OUT n + =A2×VOUT n + OUT n - =A2×VOUT n - A2 represents the power gain of the post-amplifier.

[0072] In this embodiment 1, the nth post-amplifier can be designed to include: 2 inductors LB 1,n ~LB 2,n .

[0073] LB 1,n The center tap connects to VDD; LB 1,n One end is connected to VOUT n + The other end is connected to VOUT. n - LB 2,n One end is used for output OUT n + The other end is used for outputting OUT. n - .

[0074] Simulation verification

[0075] In this embodiment 2, the above amplifier was simulated and verified, and the LNA using the traditional differential derivative structure and the LNA without the differential derivative structure were compared.

[0076] 1. In terms of gain: Under the same operating frequency band, the same number of operating stages, and the same power consumption, the amplifier provided in this embodiment 2 achieves a maximum gain of 22dB, which is 4~6dB higher than that of an LNA using a traditional differential derivative structure, showing a significant improvement.

[0077] 2. Regarding noise figure: In the same operating frequency band, the noise figure of the amplifier provided in this embodiment 2 is reduced by more than 0.5dB compared with the LNA using the traditional differential derivative structure.

[0078] 3. In terms of circuit area: The area of ​​the amplifier provided in this embodiment 2 is basically the same as that of the LNA without differential derivative structure, and is significantly smaller than that of the LNA with traditional differential derivative structure.

[0079] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A differential derivative structure circuit based on a three-coupled transformer, characterized in that, It includes: A three-coupled inductor network includes three mutually inductive inductors L1-L3, two ends of L1 are connected to a positive input signal VIN + , and two ends of L3 are connected to a negative input signal VIN - . There are N output sections; N ≥ 1; the nth output section includes: 2 positive output capacitors C 2,n + ~C 3,n + 2 positive output MOSFETs M 1,n + ~M 2,n + 2 negative output capacitors C 2,n - ~C 3,n - 2 negative output MOSFETs M 1,n - ~M 2,n - ; n∈[1,N]; M 1,n + M 2,n + They are connected in parallel to form a differential derivative structure, and their grounding terminal is grounded; M 1,n - M 2,n - The L2 is connected in parallel to form a differential derivative structure II, and its grounding terminal is grounded; one end of L2 is connected to M. 1,n + gate, C 3,n + The upper electrode plate, the other end is connected to M 1,n - gate, C 3,n - The upper plate of L2; the center tap of L2 is connected to a fixed bias voltage Vb1 to drive M, which serves as the main amplifier tube. 1,n + M 1,n - Operating in the saturation region; one end of L3 is connected to M. 2,n + gate, C 2,n + The upper electrode plate, the other end is connected to M 2,n - gate, C 2,n - The upper plate of L3; the center tap of L3 is connected to an adjustable bias voltage Vb2 to drive M, which acts as an auxiliary amplifier tube. 2,n + M 2,n - Working in the weakly inverse region; C 3,n + The lower electrode is connected to the output terminal of the differential derivative structure II, C 2,n + The lower electrode is used to output the negative output signal VOUT. n - C 3,n - The lower electrode is connected to the output terminal of the differential derivative structure, C. 2,n - The lower electrode plate is used to output the positive output signal VOUT. n + .

2. The differential derivative structure circuit based on a three-coupling transformer according to claim 1, characterized in that, VIN + VIN - It is a differential signal; VOUT n + VOUT n - It is a differential signal; VOUT n + =A1×VIN + VOUT n - =A1×VIN - A1 represents the power gain of the differential derivative structure circuit based on the three-coupling transformer.

3. The differential derivative structure circuit based on a three-coupling transformer according to claim 1, characterized in that, The center tap of L1 is connected to the power supply VDD to drive L1 to work; Or / and, L1, L2, and L3 are stacked during layout processing.

4. The differential derivative structure circuit based on a three-coupling transformer according to claim 1, characterized in that, 0.3V≤Vb1≤0.5V; 0≤Vb2≤0.4V.

5. The differential derivative structure circuit based on a three-coupling transformer according to claim 1, characterized in that, If M 1,n + M 2,n + If it is an NMOS transistor, then M 1,n + The source connection M 2,n + The source of M is used as the ground terminal of the differential derivative structure; 1,n + Drain connection M 2,n + The drain is used as the output terminal of the differential derivative structure; If M 1,n - M 2,n - If it is an NMOS transistor, then M 1,n - The source connection M 2,n - The source of M is used as the ground terminal of the differential derivative structure 2; 1,n - Drain connection M 2,n - The drain of the differential derivative structure is used as the output terminal of the differential derivative structure.

6. The differential derivative structure circuit based on a three-coupling transformer according to claim 1, characterized in that, If M 1,n + M 2,n + If it is a PMOS transistor, then M 1,n + Drain connection M 2,n + The drain of M serves as the ground terminal of the differential derivative structure. 1,n + The source connection M 2,n + The source is used as the output terminal of the differential derivative structure; If M 1,n - M 2,n - If it is a PMOS transistor, then M 1,n - Drain connection M 2,n - The drain of M serves as the ground terminal of the differential derivative structure 2; 1,n - The source connection M 2,n - The source is used as the output terminal of the differential derivative structure 2.

7. An amplifier, characterized in that, It employs a differential derivative structure circuit based on a three-coupled transformer as described in any one of claims 1-6.

8. The amplifier according to claim 7, characterized in that, The amplifier is a low-noise amplifier, comprising: The preamplifier section is used to: convert the positive input signal IN into a preamplifier. + Negative input signal IN - Enlarged to VIN + VIN - ; The differential amplifier section is the differential derivative structure circuit based on the three-coupled transformer; A bias generation unit includes: an analog-to-digital converter (DAC); the input terminal of the DAC is connected to a reference voltage Vb, the control terminal is connected to a control signal vctrl, and the output terminal is used to output Vb1; and N post-amplifier sections; the nth post-amplifier is used to: convert VOUT n + VOUT n - Amplified into a positive output signal OUT n + Negative output signal OUT n - .

9. The amplifier according to claim 8, characterized in that, The preamplifier section includes: three inductors LA1~LA3, two NMOS transistors M1~M2, and two capacitors C1~C2; the two ends of LA1 are connected to IN respectively. + IN - The center tap of LA2 is connected to Vb; one end of LA2 is connected to the gate of M1 and the upper plate of C1, and the other end is connected to the gate of M2 and the upper plate of C2; the center tap of LA3 is grounded; one end of LA3 is connected to the source of M1, and the other end is connected to the source of M2; the drain of M1 is connected to the lower plate of C2 and is used to output VIN. + The drain of M2 is connected to the lower plate of C1 and is used to output VIN. - ; Among them, IN + IN - It is a differential signal; VIN + VIN - It is a differential signal; VIN + =A0×IN + VIN - =A0×IN - A0 represents the power gain of the preamplifier section.

10. The amplifier according to claim 8, characterized in that, The nth post-amplifier includes: 2 inductors LB 1,n ~LB 2,n LB 1,n The center tap connects to VDD; LB 1,n One end is connected to VOUT n + The other end is connected to VOUT. n - LB 2,n One end is used for output OUT n + The other end is used for outputting OUT. n - ; Among them, OUT n + OUT n - It is a differential signal; OUT n + =A2×VOUT n + OUT n - =A2×VOUT n - A2 represents the power gain of the post-amplifier.

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