CN-224218366-U - Wireless receiving system and low-noise amplifying circuit thereof

Abstract

The application discloses a wireless receiving system and a low-noise amplifying circuit thereof, which are applied to the technical field of communication and comprise a first transformer, a common-gate amplifying transistor, a common-source amplifying transistor, a first resistor, a first amplifying circuit, a second amplifying circuit and a power synthesis output matching circuit; the primary coil and the secondary coil of the first transformer are respectively connected with the source electrode and the grid electrode of the common-gate amplifying transistor for transconductance enhancement, the drain electrode of the common-gate amplifying transistor is connected with the input end of the first amplifying circuit, the source electrode of the common-source amplifying transistor is grounded, the second end of the first resistor is respectively connected with the drain electrode of the common-source amplifying transistor and the input end of the second amplifying circuit, and the output end of the first amplifying circuit and the output end of the second amplifying circuit are respectively connected with the first input end and the second output end of the power synthesis output matching circuit. By applying the scheme of the application, the low-noise amplifier with low noise coefficient and high gain can be effectively realized.

Inventors

• LIU ZHIHAO
• LI ZHENNAN

Assignees

• 成都市时代速信科技有限公司

Dates

Publication Date

20260508

Application Date

20250425

Claims (10)

1. 1. The low-noise amplifying circuit is characterized by comprising a first transformer, a common-gate amplifying transistor, a common-source amplifying transistor, a first resistor, a first amplifying circuit, a second amplifying circuit and a power synthesis output matching circuit; the first end of the primary coil of the first transformer is grounded, the second end of the primary coil of the first transformer is respectively connected with the source electrode of the common-gate amplifying transistor, the first end of the first resistor and the grid electrode of the common-source amplifying transistor, and the connection end is used as the input end of the low-noise amplifying circuit; The first end of the secondary coil of the first transformer is connected with the positive electrode of the first power supply, the second end of the secondary coil of the first transformer is connected with the grid electrode of the common-gate amplifying transistor, and the drain electrode of the common-gate amplifying transistor is connected with the input end of the first amplifying circuit; the source electrode of the common source amplifying transistor is grounded, and the second end of the first resistor is respectively connected with the drain electrode of the common source amplifying transistor and the input end of the second amplifying circuit; The output end of the first amplifying circuit and the output end of the second amplifying circuit are respectively connected with the first input end and the second input end of the power synthesis output matching circuit, and the output end of the power synthesis output matching circuit is used as the output end of the low-noise amplifying circuit.
2. 2. The low noise amplification circuit of claim 1, further comprising: the first inter-stage matching circuit is arranged between the common gate amplifying transistor and the first amplifying circuit in series and used for performing inter-stage matching of the common gate amplifying transistor and the first amplifying circuit; And a second inter-stage matching circuit which is arranged in series between the common-source amplifying transistor and the second amplifying circuit and is used for performing inter-stage matching between the common-source amplifying transistor and the second amplifying circuit.
3. 3. The low noise amplification circuit of claim 2, wherein the first inter-stage matching circuit comprises a second transformer, the second inter-stage matching circuit comprising a third transformer; The first end of the primary coil of the second transformer is used as an input end of the first inter-stage matching circuit and is connected with the drain electrode of the common gate amplifying transistor, and the second end of the primary coil of the second transformer is connected with the positive electrode of the second power supply; The first end of the secondary coil of the second transformer is used as the output end of the first inter-stage matching circuit and is connected with the input end of the first amplifying circuit, and the second end of the secondary coil of the second transformer is connected with the positive electrode of the third power supply; A first end of a primary coil of the third transformer is used as an input end of the second interstage matching circuit and is connected with a drain electrode of the common source amplifying transistor, and a second end of the primary coil of the third transformer is connected with a fourth power supply positive electrode; The first end of the secondary coil of the third transformer is used as the output end of the second interstage matching circuit and is connected with the input end of the second amplifying circuit, and the second end of the secondary coil of the third transformer is connected with the positive electrode of the fifth power supply.
4. 4. The low noise amplifier circuit of claim 1, further comprising a first capacitor and a first inductor; The first end of the first capacitor is connected with the second end of the primary coil of the first transformer and the source electrode of the common-gate amplifying transistor respectively, the second end of the first capacitor is connected with the first end of the first inductor, and the second end of the first inductor is connected with the first end of the first resistor and the gate electrode of the common-gate amplifying transistor respectively.
5. 5. The low noise amplifier circuit of claim 1, wherein the first amplifier circuit comprises a first amplifier tube, a second inductor and a second capacitor; The first end of the first amplifying tube is connected with the first end of the second inductor, the second end of the second inductor is grounded, the control end of the first amplifying tube is used as the input end of the first amplifying circuit, the second end of the first amplifying tube is connected with the first end of the second amplifying tube, the control end of the second amplifying tube is connected with the first end of the second capacitor, the connection end of the second amplifying tube is connected with the positive electrode of the sixth power supply, the second end of the second capacitor is grounded, and the second end of the second amplifying tube is used as the output end of the first amplifying circuit.
6. 6. The low noise amplifier circuit of claim 1, wherein the second amplifier circuit comprises a third amplifier tube, a fourth amplifier tube, a third inductor and a third capacitor; The first end of the third amplifying tube is connected with the first end of the third inductor, the second end of the third inductor is grounded, the control end of the third amplifying tube is used as the input end of the second amplifying circuit, the second end of the third amplifying tube is connected with the first end of the fourth amplifying tube, the control end of the fourth amplifying tube is connected with the first end of the third capacitor, the connecting end of the fourth amplifying tube is connected with the positive electrode of the seventh power supply, the second end of the third capacitor is grounded, and the second end of the fourth amplifying tube is used as the output end of the second amplifying circuit.
7. 7. The low noise amplification circuit of claim 1, wherein the power combining output matching circuit comprises a fourth transformer and a fifth transformer; The first end of the primary coil of the fourth transformer is used as the first input end of the power synthesis output matching circuit, and the second end of the primary coil of the fourth transformer is connected with the first end of the primary coil of the fifth transformer and the connecting end of the primary coil of the fourth transformer is connected with the positive electrode of the eighth power supply; The second end of the secondary coil of the fifth transformer is grounded, the first end of the secondary coil of the fifth transformer is connected with the second end of the secondary coil of the fourth transformer, and the first end of the secondary coil of the fourth transformer is used as an output end of the power synthesis output matching circuit.
8. 8. The low noise amplifier circuit according to any one of claims 1 to 7, wherein the transmission lines of the common-gate amplifier transistor and the first amplifier circuit are first phase-adjustable transmission lines, and the transmission lines of the common-source amplifier transistor and the second amplifier circuit are second phase-adjustable transmission lines.
9. 9. The low noise amplifier circuit of claim 8, wherein the first phase-tunable transmission line comprises a first connection line, a second connection line, a third connection line, a fourth connection line, a fifth connection line, a sixth connection line, a first switched capacitor, a second switched capacitor, a third switched capacitor, a fourth switched capacitor, a fifth switched capacitor, and a sixth switched capacitor; The first end of the first connecting wire and the first end of the first switch capacitor are connected to the first port of the first phase-adjustable transmission line, and the first port is used as the first end of the first phase-adjustable transmission line to be connected with the common gate amplifying transistor; The second end of the first connecting wire is connected with the first end of the sixth connecting wire, the first end of the fifth connecting wire and the first end of the sixth switch capacitor are both connected to the second port of the first phase-adjustable transmission wire, and the second end of the fifth connecting wire is connected with the second end of the sixth connecting wire; The second end of the third connecting wire is connected with the midpoint of the sixth connecting wire, and the first end of the third connecting wire is respectively connected with the first end of the third switch capacitor and the first end of the fourth switch capacitor; the second end of the second connecting wire is connected with the second end of the third switch capacitor and the first end of the second switch capacitor respectively, and the second end of the second switch capacitor is connected with the first end of the first connecting wire; the second end of the fourth connecting wire is connected with the second end of the fourth switch capacitor and the first end of the fifth switch capacitor respectively, and the second end of the fifth switch capacitor is connected with the first end of the fifth connecting wire; The first end of the fourth connecting wire is connected with the second end of the sixth switching capacitor, the connecting end is connected with the third port of the first phase-adjustable transmission line, and the third port is used as the second end of the first phase-adjustable transmission line to be connected with the first amplifying circuit; The first switch capacitor, the second switch capacitor, the third switch capacitor, the fourth switch capacitor, the fifth switch capacitor and the sixth switch capacitor are all switch capacitors with adjustable on-off states.
10. 10. A radio receiving system comprising a low noise amplifying circuit according to any of claims 1 to 9.

Description

Wireless receiving system and low-noise amplifying circuit thereof Technical Field The present utility model relates to the field of communications technologies, and in particular, to a wireless receiving system and a low noise amplifying circuit thereof. Background In many communication scenarios, a wireless receiving system is required to be used, the forefront end of the wireless receiving system is usually a low noise amplifier, noise can be suppressed while signals are amplified, and performance indexes such as bandwidth, gain, noise coefficient and the like can directly influence the performance of the whole wireless receiving system. The noise figure is the most important index requirement of the low noise amplifier, and the noise figure of the whole wireless receiving system is greatly dependent on the noise interference of the low noise amplifier. Some existing low-noise amplifier architectures with two-way noise cancellation can realize noise cancellation to a certain extent, but common-gate noise cancellation architectures and common-source noise cancellation architectures of traditional schemes generally adopt auxiliary common-source amplifiers, and the auxiliary common-source amplifiers are utilized to realize noise cancellation. However, the auxiliary common source amplifier also introduces noise, so that noise voltage of a low-noise amplifier architecture with traditional double-path noise cancellation is difficult to perfectly cancel in large opposite phase such as an output end when the influence of device parasitism on circuit performance becomes large, especially in millimeter wave frequency band. In summary, how to effectively implement a low noise amplifier with low noise factor and high gain is a technical problem that needs to be solved by those skilled in the art. Disclosure of utility model The utility model aims to provide a wireless receiving system and a low-noise amplifying circuit thereof, so as to effectively realize a low-noise amplifier with low noise coefficient and high gain. In order to solve the technical problems, the utility model provides the following technical scheme: In a first aspect, the utility model provides a low noise amplifying circuit, comprising a first transformer, a common gate amplifying transistor, a common source amplifying transistor, a first resistor, a first amplifying circuit, a second amplifying circuit and a power synthesis output matching circuit; the first end of the primary coil of the first transformer is grounded, the second end of the primary coil of the first transformer is respectively connected with the source electrode of the common-gate amplifying transistor, the first end of the first resistor and the grid electrode of the common-source amplifying transistor, and the connection end is used as the input end of the low-noise amplifying circuit; The first end of the secondary coil of the first transformer is connected with the positive electrode of the first power supply, the second end of the secondary coil of the first transformer is connected with the grid electrode of the common-gate amplifying transistor, and the drain electrode of the common-gate amplifying transistor is connected with the input end of the first amplifying circuit; the source electrode of the common source amplifying transistor is grounded, and the second end of the first resistor is respectively connected with the drain electrode of the common source amplifying transistor and the input end of the second amplifying circuit; The output end of the first amplifying circuit and the output end of the second amplifying circuit are respectively connected with the first input end and the second input end of the power synthesis output matching circuit, and the output end of the power synthesis output matching circuit is used as the output end of the low-noise amplifying circuit. In one embodiment, the method further comprises: the first inter-stage matching circuit is arranged between the common gate amplifying transistor and the first amplifying circuit in series and used for performing inter-stage matching of the common gate amplifying transistor and the first amplifying circuit; And a second inter-stage matching circuit which is arranged in series between the common-source amplifying transistor and the second amplifying circuit and is used for performing inter-stage matching between the common-source amplifying transistor and the second amplifying circuit. In one embodiment, the first inter-stage matching circuit includes a second transformer, and the second inter-stage matching circuit includes a third transformer; The first end of the primary coil of the second transformer is used as an input end of the first inter-stage matching circuit and is connected with the drain electrode of the common gate amplifying transistor, and the second end of the primary coil of the second transformer is connected with the positive electrode of the second power supply; The first end of