A Wideband Receiver Front-End Circuit With Continuously Adjustable Bandwidth

Abstract

The invention discloses a broadband receiver front-end circuit with a continuously adjustable bandwidth. The circuit comprises a low noise amplifier, a main mixer, a transconductance stage circuit, a transimpedance amplifier and an output buffer stage circuit and a feedback loop, wherein the low noise amplifier amplifies a radio frequency signal, the amplified radio frequency signal is converted by the main mixer into a medium frequency voltage signal, the transconductance stage circuit converts the medium frequency voltage signal into a current signal, the current signal is converted by the transimpedance amplifier into a voltage signal, and the voltage signal is output to an off-chip digital chip through the output buffer stage circuit for processing after being amplified and filtered; and the feedback loop amplifies the value of a high-pass filter capacitor in the feedback loop through the Miller effect of a loop amplifier, thereby not only realizing the clutter filtering of the medium frequency voltage signal, but also omitting a medium frequency filter capacitor. The broadband receiver front-end circuit disclosed by the invention effectively reduces the overall area of the chip, can realize the continuously adjustable bandwidth, and can also further reduce the equivalent on-resistance of the mixer and inhibit out-of-band interference signals.

Description

technical field [0001] The invention belongs to the field of multi-mode and multi-standard receivers, in particular to a wideband receiver front-end circuit with continuously adjustable bandwidth. Background technique [0002] With the continuous increase of multi-mode and multi-standard communication carrier frequency bands, the complexity and cost of narrow-band multi-mode receivers are also greatly increased. The development and evolution of narrow-band multi-mode structures is not sustainable, while wideband multi-mode multi-standard receivers have The carrier frequency range is wide, the signal dynamic range is large, and the channel bandwidth changes widely. Therefore, the broadband multi-mode multi-standard receiver circuit has become the development trend of the multi-mode multi-standard receiver. [0003] However, in order to realize the IF bandwidth suitable for various communication standards, a large number of IF filter capacitors must be placed in the chip, such...

AI Technical Summary

Problems solved by technology

Due to the relatively large size of the IF filter capacitor, this greatly increases the area of ​​the chip, which increases the cost of the chip and hinders the commercialization of multi-mode and multi-standard receivers

At the same time, due to the selection and solidification of the capacitor size in the chip, the designed bandwidth may change with the fluctuation of the chip process, thus reducing the yield of the chip

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