Broadband negative feedback amplifier

Abstract

The broadband negative feedback amplifier comprises an input matching power supply network, a driving-stage high-gain amplification network, an inter-stage matching power supply network, a power-stage high-gain amplification network, a first feedback network and a second feedback network. A common-gate double-feedback two-stage stacking amplification structure is adopted, the reliability of the circuit can be improved, high gain and high linearity indexes are achieved, and meanwhile the broadband characteristic is high. In addition, through the common-gate double-feedback effect, the influence of process fluctuation and temperature fluctuation on the radio frequency performance of the amplifier can be improved.

Description

technical field [0001] The invention belongs to the technical fields of 5G communication and integrated circuits, and in particular relates to a broadband negative feedback amplifier. Background technique [0002] With the continuous increase of mobile communication users and the continuous improvement of user communication quality requirements, the industry has accelerated the pace of development of wireless communication systems. At present, communication equipment urgently needs the development of high-performance, high-integration and low-power RF front-ends, so as to reduce the number of surface mount devices and reduce costs. Therefore, the market urgently needs broadband, high-gain, high-linearity, and low-power RF. amplifier chip. [0003] There are many circuit structures of common broadband, high gain, high linearity, low power consumption and low noise amplifiers, the most typical one is a current multiplexed common source (or common emitter) amplifier based on t...

AI Technical Summary

Problems solved by technology

[0003] There are many circuit structures of common broadband, high gain, high linearity, low power consumption and low noise amplifiers, the most typical one is a current multiplexed common source (or common emitter) amplifier based on traditional RLC negative feedback technology, however, There are some design deficiencies in this kind of amplifier, which are mainly reflected in: (1) Using traditional RLC negative feedback technology, often from the output port (drain or collector) of the amplifier core, directly connected to the (gate) through an RLC feedback loop Pole or base), but this direct feedback method will directly suppress the low-frequency gain index, deteriorate the low-frequency linearity index, and even introduce a high-frequency unstable resonance due to a direct feedback loop from output to input, resulting in circuit stability. Deterioration; (2) The structure of the current multiplexing amplifier needs to use the feed inductance and large capacitance to realize the static bias multiplexing of two common source (or common emitter) amplifiers. This structure wastes a large chip area and may be due to the inductance The problem of the self-resonant frequency of the capacitor and the capacitor causes the reliability risk of the circuit, and the power capacity is low, and the linearity index needs to be improved

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