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...

AI Technical Summary

Problems solved by technology

[0004] A variety of solutions have been proposed for multi-band systems, such as combining narrow-band low-noise amplifiers and switching between bands, resulting in larger mold areas, higher power consumption, and higher costs; single-chip broadband low-noise amplifiers are also commonly used. It can cover all working frequency bands, but the monolithic broadband low noise amplifier usually sacrifices noise and gain for bandwidth, and selects frequency through the front-end filter, and the lower limit of receiver sensitivity is affected by noise, which will deteriorate the reception machine sensitivity

And due to the nonlinearity of the receiver, the wideband mode is more susceptible to interference from out-of-band signals

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