Shared Mixer Bias Circuit for Balanced LO Loading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The presence of multiple mixers with various configurations in RF systems leads to significant duplication of circuitry, increasing die size and power consumption, which affects signal quality and data rates due to unbalanced loading on local oscillator signals.
Innovation Solution
Sharing mixer bias circuits between similarly configured mixers, such as auxiliary mixers with a main mixer, balances the load on local oscillator signals, reducing the number of drivers and buffers, and minimizing die size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple mixers with various configurations are used in RF systems, then signal quality and data rates are improved, but die size and power consumption increase significantly
Solution Approach 1:
The patent combines multiple mixer configurations into a unified mixer structure that can operate in different modes. Instead of implementing separate auxiliary mixers and main mixer as distinct hardware blocks, a single mixer is designed with configurable operation modes that can function as either auxiliary or main mixer depending on the active configuration, thereby reducing die size while maintaining signal quality
Solution Approach 2:
The mixer is designed with multi-functionality to serve multiple roles. The same mixer circuitry can be configured to operate as an auxiliary mixer or a main mixer based on control signals, eliminating the need for dedicated hardware for each mixer type and reducing overall die size while preserving the benefits of multiple mixer configurations
2Reliability
If multiple mixers with various configurations are used in RF systems, then signal quality and data rates are improved, but power consumption increases significantly
Solution Approach 1:
The patent merges the functionality of multiple mixers into a single configurable mixer structure, reducing the total number of active circuit blocks. By sharing common circuitry and control logic among what would have been separate auxiliary and main mixers, power consumption is reduced while maintaining the signal quality benefits of multiple mixer configurations
Solution Approach 2:
The universal mixer design allows a single circuit to perform multiple functions that previously required separate dedicated circuits. This multi-functionality reduces the overall power consumption by eliminating redundant circuitry while preserving the ability to achieve high signal quality through configurable operation modes
3Reliability
If separate mixer bias circuits are used for each mixer, then mixer operation is optimized, but the number of drivers and buffers increases
Solution Approach 1:
The patent merges separate mixer bias circuits into a shared biasing structure. Instead of providing independent bias circuits for each auxiliary and main mixer, a unified bias circuit is implemented that can serve multiple mixer configurations, thereby reducing the number of drivers and buffers while maintaining optimized mixer operation through proper biasing
4Area of stationary object
If auxiliary mixers are sized smaller than main mixer, then die size is reduced, but load balancing on LO signals becomes unbalanced
Solution Approach 1:
The patent applies local quality by implementing differential sizing strategies for different mixer configurations within the unified structure. The mixer can be configured with appropriate transistor sizes and biasing levels specific to its operational role (auxiliary or main) while sharing the same physical circuitry, thus achieving both die size reduction and load balancing on LO signals through localized parameter optimization
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communications that support downconversion in a radio frequency (RF) system. In a first aspect, an apparatus for wireless communications includes a first mixer coupled to an input node; a second mixer coupled to the input node; and a first mixer bias circuit configured to output a first local oscillator (LO) signal, the first mixer bias circuit coupled to the first mixer and to the second mixer to output the first LO signal to the first mixer and to the second mixer. Other aspects and features are also claimed and described.