Reconfigurable LNA With Gamma Inverting Network for Multi-Band Matching
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Solution Overview
Problem
Traditional low-noise amplifiers (LNAs) require reconfiguration of the gate periphery for different frequency bands, which introduces parasitic electrical characteristics that hinder the exploitation of inherent noise figure properties, especially at high frequencies, necessitating a reconfigurable LNA with a fixed gate periphery and adjustable noise matching architecture for multi-octave frequency operation.
Innovation Solution
A reconfigurable LNA design incorporating a gamma inverting network, parallel feedback network, and series feedback network with switches that enable or disable these networks based on frequency bands, allowing the amplifier to maintain optimal noise figure and impedance matching across a wide frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional reconfiguration of gate periphery is performed for each frequency band, then frequency adaptability is improved, but parasitic electrical characteristics worsen and prohibit exploiting inherent NFMIN properties at high frequencies
Solution Approach 1:
The patent changes the configuration parameters of feedback networks (parallel feedback network and series feedback network) instead of reconfiguring the gate periphery itself. By switching these feedback networks on and off based on frequency band, the patent achieves frequency adaptability while maintaining a fixed gate periphery that preserves inherent NFMIN properties at high frequencies.
2Adaptability or versatility
If additional radio frequency isolation switches are added for reconfiguration, then frequency band switching capability is improved, but device complexity and parasitic effects worsen
Solution Approach 1:
The feedback networks serve multiple functions: they provide frequency band switching capability, maintain impedance matching, and preserve noise figure properties across different frequency bands. This multi-functionality eliminates the need for separate radio frequency isolation switches for each frequency band, reducing overall device complexity.
3Object-generated harmful factors
If fixed gate periphery is used for multi-octave frequency operation, then parasitic effects are reduced, but noise matching architecture complexity increases
Solution Approach 1:
The patent applies different feedback network configurations to different frequency bands: the parallel feedback network is enabled for lower frequency bands while the series feedback network is enabled for higher frequency bands. This localized application of feedback networks optimizes noise matching for each frequency range while maintaining a fixed gate periphery.
Data Source
AI summary
A reconfigurable low-noise amplifier (LNA) is disclosed. The reconfigurable LNA includes amplifier circuitry having a gate terminal coupled to an input terminal, a source terminal coupled to a fixed voltage node, and a drain terminal coupled to an output terminal. The reconfigurable LNA further includes a gamma inverting network (GIN) coupled between the input terminal and the fixed voltage node, wherein the GIN has a first switch configured to disable the GIN during operation at first frequencies within a lower frequency band relative to a higher frequency band and to enable the GIN during operation at second frequencies within the higher frequency band.