Gain-controllable wide-band low-noise amplifier

Abstract

The invention provides a gain-controllable wide-frequency low-noise amplifier, wherein, a state configuration device is used for generating input and output configuration signals, gains and wave section switch control signals, respectively controlling an input resistance matching circuit, a gain-controllable wide-frequency low-noise amplifier and an output resistance matching circuit, and setting suitable input resistance, amplifier gain, working bandwidth and output resistance. RF input signals can be transmitted with maximum efficiency to the gain-controllable amplifier through the input resistance matching circuit and generate little energy reflection. Subsequently, owing to the self-adaptability of the amplifier gain, the amplifier adjusts the self-gain according to the input RF signal amplitude, leads the output voltage to be stable, and ensures the normal operation of the sub-step circuit. Owing to the existence of the output resistance matching circuit, the system output signal can be transmitted to the sub-step circuit with the maximum efficiency, thus ensuring the working efficiency of the circuit. The gain-controllable wide-frequency low-noise amplifier of the invention can be applied to the wireless transceiver with different resistance antennas and different working frequency protocols, and can carry out the self-adaptability gain adjustment.

Description

technical field [0001] The invention relates to the fields of wireless local area networks and radio frequency integrated circuits, in particular to a gain-controllable broadband low-noise amplifier, which is especially suitable for radio frequency front-end transmitters of various wireless protocol network system-on-chips. Background technique [0002] In the radio frequency transceiver in the modern wireless communication field, the noise figure and gain of the low noise amplifier (Low Noise Amplifier, LNA) as the front end of the radio frequency receiver have a crucial impact on the signal-to-noise ratio of the entire receiver system; in addition, In practical applications, the linear range and the matching of the front and rear components have high requirements, and the LNA has become an extremely important component. [0003] With the development of wireless technology, the requirements for LNA work are getting higher and higher, which are mainly reflected in the follow...

AI Technical Summary

Problems solved by technology

[0007] [4] Low power consumption, which is a compromise with the previous three items, but due to the widespread use of portable devices, more requirements are placed on the power consumption of RF receivers, which is also the most important factor for LNA design. limit

However, due to performance limitations such as power consumption, its improvement is limited

The second and third points are limited by the fourth point, showing a strong compromise relationship. In the past, many structures were compromised by cascading the LNA with a variable gain amplifier, such as An 802.11g WLAN SoC (IEEEJOURNAL OF SOLID -STATE CIRCUITS, VOL.40, NO.12, DECEMBER2005), but it will generate additional noise, which will degrade the performance of the whole receiver

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