阅读说明：本技术 一种基于多抽头电感的分布式放大器 (Distributed amplifier based on multi-tap inductor ) 是由 梁欣 余力澜 况立雪 马小龙 董钊 韩春杰 刘跃 于 2021-09-02 设计创作，主要内容包括：本发明公开了属于射频集成电路技术领域的一种基于多抽头电感的分布式放大器。带有4个抽头的多抽头电感的等效电路包括P1抽头、P2抽头、P3抽头、P4抽头、L1电感、L2电感和L3电感；其中,P1抽头、L1电感、L2电感、L3电感和P4抽头依次串联,L1电感与L2电感的连接处引出P2抽头,L2电感与L3电感的连接处引出P3抽头；P1抽头与L1电感的连接端、P2抽头与L2电感的连接端以及P3抽头与L3电感的连接端互为同名端。基于多抽头电感的分布式放大器减少了分布式放大器所需的电感数目,从而减小了芯片面积,降低了分布式放大器的成本。(The invention discloses a distributed amplifier based on a multi-tap inductor, belonging to the technical field of radio frequency integrated circuits. The equivalent circuit of the multi-tap inductor with 4 taps comprises a P1 tap, a P2 tap, a P3 tap, a P4 tap, an L1 inductor, an L2 inductor and an L3 inductor; the P1 tap, the L1 inductor, the L2 inductor, the L3 inductor and the P4 tap are sequentially connected in series, the P2 tap is led out from the connection position of the L1 inductor and the L2 inductor, and the P3 tap is led out from the connection position of the L2 inductor and the L3 inductor; the connecting end of the P1 tap and the L1 inductor, the connecting end of the P2 tap and the L2 inductor, and the connecting end of the P3 tap and the L3 inductor are the same-name ends. The distributed amplifier based on the multi-tap inductor reduces the number of inductors needed by the distributed amplifier, thereby reducing the chip area and the cost of the distributed amplifier.)

1. A multi-tap inductance based distributed amplifier is characterized in that an equivalent circuit of a multi-tap inductance with 4 taps comprises a P1 tap, a P2 tap, a P3 tap, a P4 tap, an L1 inductance, an L2 inductance and an L3 inductance; the P1 tap, the L1 inductor, the L2 inductor, the L3 inductor and the P4 tap are sequentially connected in series, the P2 tap is led out from the connection position of the L1 inductor and the L2 inductor, and the P3 tap is led out from the connection position of the L2 inductor and the L3 inductor; the connecting end of the P1 tap and the L1 inductor, the connecting end of the P2 tap and the L2 inductor and the connecting end of the P3 tap and the L3 inductor are the same-name ends;

the distributed amplifier with 5-stage amplification comprises 4 multi-tap inductors with 4 taps, 5 transistors and two resistors; the first multi-tap inductor is connected with the second multi-tap inductor in series through a P14 tap and a P21 tap, and the third multi-tap inductor is connected with the fourth multi-tap inductor in series through a P34 tap and a P41 tap; the gates of the T1 transistor, the T2 transistor, the T3 transistor, the T4 transistor and the T5 transistor are respectively connected with a P32 tap, a P33 tap, a P34 tap, a P42 tap and a P43 tap, and the drains of the T1 transistor, the T2 transistor, the T3 transistor, the T4 transistor and the T5 transistor are respectively connected with a P12 tap, a P13 tap, a P14 tap, a P22 tap and a P23 tap; the sources of the 5 transistors are all grounded; the P11 tap is connected with the power ground through an R1 resistor, the P44 tap is connected with the power input end through an R2 resistor, the P31 tap is connected with the signal input end, and the P24 tap is connected with the signal output end.

2. The multi-tap inductance based distributed amplifier of claim 1, wherein the number of taps of said multi-tap inductance is 4 and more.

3. The multi-tap inductance based distributed amplifier of claim 1 or 2, wherein for a fixed number of stages of distributed amplifiers, the number of multi-tap inductances used decreases as the number of taps per multi-tap inductance increases.

4. The multi-tap inductance based distributed amplifier of claim 3, wherein the fixed number of stages is 5 stages and above.

Technical Field

The invention relates to the technical field of radio frequency integrated circuits, in particular to a distributed amplifier based on a multi-tap inductor.

Background

5G communication technology is being widely applied, and various frequency bands from 450MH to 52.6GHz are allocated to 5G communication by countries in the world. Therefore, broadband amplifiers capable of covering 5G frequency band are also the current research focus. On the other hand, in order to improve the data rate and the ranging accuracy, high-speed serial communication and radar have great requirements on a broadband amplifier. In the existing broadband amplifier circuit technology, the distributed amplifier has the characteristics of low-pass characteristic, high bandwidth, simple structure and the like, so that the distributed amplifier becomes a research hotspot in the industry.

Because the traditional distributed amplifier needs to use multiple transmission lines, a large chip area is consumed in the design on a silicon-based process, and the cost is high. To reduce the area, researchers have replaced the transmission line with multiple independent inductors. However, the inductor still occupies a large chip area due to the large number of inductors.

Aiming at the problem that the occupied area of a transmission line or an inductor in the existing distributed amplifier is large, the invention provides a brand-new distributed amplifier realization structure.

Disclosure of Invention

The invention aims to provide a multi-tap inductor-based distributed amplifier, which is characterized in that an equivalent circuit of a multi-tap inductor with 4 taps comprises a P1 tap, a P2 tap, a P3 tap, a P4 tap, an L1 inductor, an L2 inductor and an L3 inductor; the P1 tap, the L1 inductor, the L2 inductor, the L3 inductor and the P4 tap are sequentially connected in series, the P2 tap is led out from the connection position of the L1 inductor and the L2 inductor, and the P3 tap is led out from the connection position of the L2 inductor and the L3 inductor; the connecting end of the P1 tap and the L1 inductor, the connecting end of the P2 tap and the L2 inductor and the connecting end of the P3 tap and the L3 inductor are the same-name ends;

the distributed amplifier with 5-stage amplification comprises 4 multi-tap inductors with 4 taps, 5 transistors and two resistors; the first multi-tap inductor is connected with the second multi-tap inductor in series through a P14 tap and a P21 tap, and the third multi-tap inductor is connected with the fourth multi-tap inductor in series through a P34 tap and a P41 tap; the gates of the T1 transistor, the T2 transistor, the T3 transistor, the T4 transistor and the T5 transistor are respectively connected with a P32 tap, a P33 tap, a P34 tap, a P42 tap and a P43 tap, and the drains of the T1 transistor, the T2 transistor, the T3 transistor, the T4 transistor and the T5 transistor are respectively connected with a P12 tap, a P13 tap, a P14 tap, a P22 tap and a P23 tap; the sources of the 5 transistors are all grounded; the P11 tap is connected with the power ground through an R1 resistor, the P44 tap is connected with the power input end through an R2 resistor, the P31 tap is connected with the signal input end, and the P24 tap is connected with the signal output end.

The number of taps of the multi-tap inductor is 4 or more.

For a fixed number of stages of distributed amplifiers, the number of multi-tap inductors used decreases as the number of taps per multi-tap inductor increases.

The fixed stage number is 5 stages or more.

The invention has the beneficial effects that:

the invention reduces the number of inductors needed by the distributed amplifier, thereby reducing the chip area and the cost of the distributed amplifier.

Drawings

FIG. 1 is a basic block diagram of a distributed amplifier;

FIG. 2 is a distributed amplifier model using lumped modeling;

FIG. 3 is a schematic diagram of a multi-tap inductor;

FIG. 4 is an equivalent circuit diagram of a multi-tap inductor;

fig. 5 is a schematic diagram of a distributed amplifier employing a multi-tap inductor.

Detailed Description

The invention provides a multi-tap inductor based distributed amplifier, which is further described with reference to the accompanying drawings and specific embodiments.

The basic structure of a distributed amplifier is shown in fig. 1 and is formed by a cascade of a plurality of transistors, the gates of which are connected to a common impedance Z_0gAnd an inductor l_gAnd its drain is connected to a transmission line having an impedance Z_0dAnd an inductance L_dThe transmission line of (1). The working principle is that input signals sequentially arrive along a grid transmission lineAnd each transistor amplifies the input signal, and then output signals are sequentially superposed along the drain transmission line and finally output. Because the signals are required to be superposed in sequence, all output signals need to have the same phase at the same position, and the following requirements are met:

β_gL_g＝β_dL_d

wherein, beta_gAnd beta_dThe propagation constants of the gate and the drain, respectively.

Fig. 2 shows a distributed amplifier model using lumped modeling, which uses a larger number of inductors and occupies a larger chip area. The schematic diagram of the multi-tap inductor of the present invention is shown in fig. 3, compared with the common inductor, the multi-tap inductor has two more taps (P3 and P2) led from the inside, and a larger number of taps can be led according to the actual requirement. The equivalent circuit structure is shown in fig. 4, and an inductor is respectively arranged at the taps P1 and P2, P2 and P3, and P3 and P4, and inductive coupling exists between the two taps. A P1 tap, an L1 inductor, an L2 inductor, an L3 inductor and a P4 tap are sequentially connected in series, a P2 tap is led out from the connection position of the L1 inductor and the L2 inductor, and a P3 tap is led out from the connection position of the L2 inductor and the L3 inductor; the connecting end of the P1 tap and the L1 inductor, the connecting end of the P2 tap and the L2 inductor, and the connecting end of the P3 tap and the L3 inductor are the same-name ends. Compared with three independent inductors, the multi-tap inductor is equivalent to stacking the independent inductors together, and the inductor area is reduced.

A schematic of a distributed amplifier using a multi-tap inductor is shown in fig. 5. The first multi-tap inductor is connected with the second multi-tap inductor in series through a P14 tap and a P21 tap, and the third multi-tap inductor is connected with the fourth multi-tap inductor in series through a P34 tap and a P41 tap; the gates of the T1 transistor, the T2 transistor, the T3 transistor, the T4 transistor and the T5 transistor are respectively connected with a P32 tap, a P33 tap, a P34 tap, a P42 tap and a P43 tap, and the drains of the T1 transistor, the T2 transistor, the T3 transistor, the T4 transistor and the T5 transistor are respectively connected with a P12 tap, a P13 tap, a P14 tap, a P22 tap and a P23 tap; the sources of the 5 transistors are all grounded; the P11 tap is connected with the power ground through an R1 resistor, the P44 tap is connected with the power input end through an R2 resistor, the P31 tap is connected with the signal input end, and the P24 tap is connected with the signal output end.

For a 5-stage amplification distributed amplifier, if independent inductors are used, the number of required inductors is 12. When the four-tap inductor is adopted, the number of the inductors is reduced from 12 of the independent inductors to 4 of the multi-tap inductors, and the chip area is greatly reduced. When a five-tap or six-tap inductor is adopted, the number of the inductors can be further reduced.

Fig. 5 illustrates a specific implementation of a four-tap inductor based distributed amplifier, taking a single-ended five-stage distributed amplifier as an example. The five-stage distributed amplifier can be popularized to more-stage design, and the four-tap inductor can also be popularized to the inductor with more taps.

The present invention is not limited to the above embodiments, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.