Tunable broadband low-noise amplifier

Abstract

The invention relates to the technical field of radio frequency, and discloses a tunable broadband low-noise amplifier. The tunable broadband low-noise amplifier comprises a matching network, a switched capacitor output frequency selection network and an amplifying circuit; a signal input end is connected with the matching network for noise matching; the amplifying circuit is of a common-source common-gate structure. The grid of the first transistor is connected with the matching network; the grid electrode of the second transistor is grounded after being connected with a third capacitor, thesource electrode of the first transistor is grounded after being connected with a third inductor, the drain electrode of the second transistor is grounded after being connected with a fifth inductor and a fourth capacitor, the drain electrode of the second transistor is further connected with a switched capacitor output frequency-selecting network and a fourth inductor, and the fourth inductor isconnected with a signal output end. According to the structure, the switched capacitor can be adjusted to output the frequency-selecting network, and the conversion of the working frequency is realized, so that the performance of the low-noise amplifier on each frequency band is improved, the gain and noise indexes are improved, and the receiver sensitivity is improved. The input network with thestructure has broadband characteristics, and the output network has narrowband and tunable characteristics.

Description

technical field

[0001] The invention relates to the field of radio frequency technology, in particular to a tuneable broadband low noise amplifier. Background technique

[0002] With the rapid development of wireless communication technology, a series of wireless communication protocols have been formulated internationally. In order to meet various needs, multi-frequency and multi-mode mobile terminals have become a new direction of wireless communication development. On the other hand, the rapid popularization of portable devices has stricter requirements on the miniaturization and low power consumption of the devices, and the miniaturization and low power consumption of wireless communication radio frequency modules are more urgent. As an important device for wireless communication, the low noise amplifier needs to process the signal received by the antenna and reduce the noise of the communication module. Therefore, the low noise amplifier is very important for the whol...

Examples

Embodiment Construction

[0025] In order to clarify the purpose, technical solution and advantages of the present invention more clearly, the present invention will be further described below in conjunction with the accompanying drawings.

[0026] Such as figure 2 , the tunable broadband low-noise amplifier is composed of a broadband noise matching network, a switched capacitor output frequency selection network and a common-source common-gate amplifier circuit structure; the amplifier circuit is a cascode (common-source common-gate) structure, which uses a common-source transistor , the first transistor Q1 and the second transistor Q2, the drain of the first transistor Q1 is connected to the source of the second transistor Q2, and the overall circuit performance is optimized by using the source inductance negative feedback, wherein the third inductance L3 is the source negative feedback inductance, connected The source of the first transistor Q1 can improve the stability of the circuit and provide t...

technical field

[0001] The invention relates to the field of radio frequency technology, in particular to a tuneable broadband low noise amplifier. Background technique

[0002] With the rapid development of wireless communication technology, a series of wireless communication protocols have been formulated internationally. In order to meet various needs, multi-frequency and multi-mode mobile terminals have become a new direction of wireless communication development. On the other hand, the rapid popularization of portable devices has stricter requirements on the miniaturization and low power consumption of the devices, and the miniaturization and low power consumption of wireless communication radio frequency modules are more urgent. As an important device for wireless communication, the low noise amplifier needs to process the signal received by the antenna and reduce the noise of the communication module. Therefore, the low noise amplifier is very important for the whol...

Examples

Embodiment Construction

[0025] In order to clarify the purpose, technical solution and advantages of the present invention more clearly, the present invention will be further described below in conjunction with the accompanying drawings.

[0026] Such as figure 2 , the tunable broadband low-noise amplifier is composed of a broadband noise matching network, a switched capacitor output frequency selection network and a common-source common-gate amplifier circuit structure; the amplifier circuit is a cascode (common-source common-gate) structure, which uses a common-source transistor , the first transistor Q1 and the second transistor Q2, the drain of the first transistor Q1 is connected to the source of the second transistor Q2, and the overall circuit performance is optimized by using the source inductance negative feedback, wherein the third inductance L3 is the source negative feedback inductance, connected The source of the first transistor Q1 can improve the stability of the circuit and provide t...

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