Reconfigurable RF Analog Front End for Wideband and Narrowband DSA
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Solution Overview
Problem
Existing RF circuits struggle to support both wideband and narrowband operations efficiently, as single fixed-design digital signal attenuators (DSAs) fail to accommodate multiple carriers or frequency bands, leading to issues with noise figures and frequency aliasing.
Innovation Solution
A highly configurable DSA with a reconfigurable output network that supports both bandpass and wideband modes of operation, utilizing cross-coupled transistors and a high-pass filter to improve the S11 parameter and reduce noise figures, while consuming less chip area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fixed-design digital signal attenuator (DSA) is used, then the device complexity is reduced, but the adaptability to support multiple carriers or frequency bands deteriorates
Solution Approach 1:
The patent implements a reconfigurable output network that can dynamically switch between different configurations (bandpass mode with narrow bandwidth and wideband mode with wide bandwidth) using control signals. This allows the DSA to adapt its characteristics based on the operating frequency band, resolving the contradiction between fixed design simplicity and multi-band adaptability.
Solution Approach 2:
The patent creates a universal DSA design that can perform multiple functions by supporting both bandpass and wideband modes within a single device. The reconfigurable output network enables the same hardware to serve different frequency bands and operational requirements, eliminating the need for multiple separate DSAs.
2Manufacturing precision
If a fixed-design DSA is used, then the manufacturing precision requirements are simplified, but the noise figure performance deteriorates across different frequency bands
Solution Approach 1:
The reconfigurable output network dynamically adjusts the circuit configuration based on the operating frequency, optimizing the noise figure for each specific band. This dynamic adaptation allows the DSA to maintain low noise figures across wide frequency ranges without requiring extremely precise fixed manufacturing tolerances.
Solution Approach 2:
The patent changes the electrical parameters of the output network through reconfiguration, adjusting impedance matching and signal paths according to the operating frequency. This parameter adaptation optimizes noise figure performance for different frequency bands while maintaining reasonable manufacturing precision requirements.
3Adaptability or versatility
If a reconfigurable output network is added to support multiple modes, then the adaptability improves, but the device complexity increases
Solution Approach 1:
The output network is segmented into distinct functional blocks (first output network and second output network) that can be independently controlled. This segmentation allows for modular reconfiguration without requiring complete redesign of the entire output stage, managing complexity through structured division.
Solution Approach 2:
The reconfigurable output network uses control signals to dynamically switch between configurations, allowing adaptability to be achieved through software/control logic rather than multiple physical hardware variants. This dynamic approach manages complexity by using a single physical structure that changes its electrical characteristics based on control inputs.
Data Source
AI summary
In an embodiment, an electronic circuit includes: an amplifier having first and second outputs, first and second inputs, and first and second terminals; a high pass filter coupled between the first and second terminals of the amplifier; and a configurable output network coupled between the first and second outputs of the amplifier.