Reconfigurable Wideband Split LNA for Multi-Band Gain Matching
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Solution Overview
Problem
Current RF receiver front-end designs face challenges in meeting conflicting requirements such as wideband frequency coverage, multiple gain modes, low noise figure, and power consumption while maintaining cost-effectiveness and compact size, especially with the emergence of 5G standards that demand carrier aggregation and backward compatibility.
Innovation Solution
A reconfigurable RF receiver front-end design featuring a cascode amplifier with a configurable input and output matching network, utilizing a switching network to adjust gain and bandwidth, and incorporating a source follower amplifier stage for improved frequency independence and linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate sets of LNAs, switches and filters are dedicated to different frequency bands, then frequency band coverage and performance are improved, but area and component count increase significantly
Solution Approach 1:
A single LNA is designed to serve multiple frequency bands (e.g., both LTE band B42 and band B43) through reconfigurable matching networks. The LNA can be tuned to different frequency ranges by switching between different capacitor values in the input and output matching networks, eliminating the need for separate LNAs for each band and reducing overall IC area.
Solution Approach 2:
The LNA incorporates reconfigurable matching networks with switchable capacitors that allow dynamic adjustment of the resonant frequency and impedance matching characteristics. This enables the same LNA circuit to adapt to different frequency bands by changing the capacitance values, providing multi-band support without requiring multiple dedicated LNAs.
2Adaptability or versatility
If multiple LNAs are used to cover different frequency bands, then frequency coverage is improved, but cost increases due to larger IC size
Solution Approach 1:
The LNA is designed as a universal amplifier that can operate across multiple frequency bands through reconfigurable matching networks. By using a single LNA with adjustable parameters rather than multiple dedicated LNAs, the manufacturing cost is reduced due to smaller IC area and fewer components.
Solution Approach 2:
The matching networks incorporate switchable capacitors that allow changing the electrical parameters (capacitance values) to adjust the LNA's operating frequency and impedance characteristics. This parameter reconfigurability enables one LNA to replace multiple LNAs, reducing manufacturing cost.
3Adaptability or versatility
If adjustable gain modes are implemented, then dynamic range handling is improved, but device complexity increases
Solution Approach 1:
The LNA incorporates reconfigurable matching networks with switchable capacitors that allow dynamic adjustment of gain and frequency characteristics. The same switching mechanism used for frequency tuning also enables gain mode selection, providing dynamic range adaptation without requiring separate complex gain control circuits.
Data Source
AI summary
Methods and devices addressing design of wideband LNAs with gain modes are disclosed. The disclosed teachings can be used to reconfigure RF receiver front-end to operate in various applications imposing stringent and conflicting requirements. Wideband and narrowband input and output matching with gain modes using a combination of the same hardware and a switching network are also disclosed. The described methods and devices also address carrier aggregation requirements and provide solutions that can be used both in single-mode and split-mode operations.