Programmable IF Dual Conversion Receiver With Continuous DC Offset Removal
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Solution Overview
Problem
Existing dual conversion receivers face challenges in miniaturization and performance enhancement due to limitations in analog RF circuits, particularly in removing DC offsets with precision and accommodating multiple communication standards within a reduced physical size.
Innovation Solution
A dual conversion receiver architecture with two-stage frequency translation and continuous DC offset removal, implemented entirely on an integrated circuit, utilizing programmable intermediate frequencies and variable low-pass filtering to accommodate multiple standards, and featuring a DC offset cancellation module for precise removal of unwanted offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual conversion receiver architecture is used to accommodate multiple communication standards, then adaptability is improved, but device complexity increases
Solution Approach 1:
The receiver is designed with programmable intermediate frequency and variable low-pass filtering capabilities that allow it to accommodate multiple communication standards (television, radio, wireless communications) through a single unified architecture, eliminating the need for multiple dedicated receivers for different standards
2Volume of moving object
If analog RF circuits are miniaturized to reduce physical size, then device size is reduced, but manufacturing precision requirements increase
Solution Approach 1:
A DC offset cancellation module is introduced as an intermediary component that actively compensates for DC offsets generated by the miniaturized analog RF circuits, allowing the circuits to be densely integrated without sacrificing offset removal precision
Solution Approach 2:
The DC offset cancellation module continuously monitors and removes DC offsets from the received signals, providing real-time feedback compensation that maintains signal integrity despite the reduced physical size and increased circuit density
3Measurement precision
If continuous DC offset removal is implemented to improve signal integrity, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The DC offset cancellation functionality is merged into the existing dual conversion receiver architecture, sharing common components such as the intermediate frequency stage and low-pass filters, thereby improving signal integrity without proportionally increasing overall device complexity
Data Source
AI summary
A dual conversion receiver architecture that converts a radio frequency signal to produce a programmable intermediate frequency whose channel bandwidth and frequency can be changed using variable low-pass filtering to accommodate multiple standards for television and other wireless standards. The dual conversion receiver uses a two stage frequency translation and continual DC offset removal. The dual conversion receiver can be completely implemented on an integrated circuit with no external adjustments.