Self-biased ultra wideband low-power-consumption low-noise amplifier (LNA)

Abstract

The invention provides a self-biased ultra wideband low-power-consumption low-noise amplifier (LNA) and belongs to the field of radio frequency integrated circuits. The LNA only contains a low-frequency amplifier stage and a high-frequency amplifier stage. At the low-frequency amplifier stage of the LNA, an active load is combined with the resistive negative feedback technology to provide bias for a circuit at the same stage and a circuit at a backward stage, self-bias of the overall LNA circuit is achieved, the circuit design is simplified, and circuit power consumption is restrained. According to the structural features of the circuit, and high-frequency matching and noise performance of the circuit are optimized by fully utilizing parasitic inductance of bonding wires. At the high-frequency amplifier stage, the working frequency range of the LNA is expanded through the inductance peaking technology. The LNA can stably work within the frequency range of 0.2-6 GHz, and gain of 16+ / -1.3 dB, the noise coefficient smaller than 2-8 dB and good input matching are maintained. The self-biased ultra wideband low-power-consumption LNA can be applied to receiver front-end chips applied to digital broadcasting, wireless local area networks, ultrashort wave radars and other devices.

Description

technical field [0001] The invention belongs to the field of radio frequency integrated circuits, and relates to a low noise amplifier (Low Noise Amplifier, hereinafter referred to as LNA), especially an ultra-wideband low-power LNA without an independent bias circuit and powered by a single power supply. Background technique [0002] Driven by factors such as cost, integration and power consumption, CMOS technology has achieved unprecedented development. The continuous improvement of the cut-off frequency of CMOS transistors has increased the degree of freedom in the design of integrated circuits in frequency bands below a few GHz. With the development of multimedia technology and communication technology, the LNA at the front end of the receiver is expected to work at hundreds of MHz to several GHz to adapt to fields such as wireless local area networks (5GHz (802.11a) and 2.4GHz (802.11b / g)) application requirements. This demand has triggered more attention and research...

AI Technical Summary

Problems solved by technology

However, the first implementation method will occupy a large chip area, and has high power consumption and poor noise performance; the second method is not easy to achieve wideband input matching; the third method is difficult to achieve high flat gain

In addition, the first and second ways usually cannot be realized by self-biasing method, which complicates the design

To sum up, the realization of UWB LNA must take into account the power consumption, matching and design complexity of the circuit

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