Millimeter Wave RF Architecture for Sub-7 GHz Co-Running Stability
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Solution Overview
Problem
Conventional RF architectures in millimeter wave transceivers are vulnerable to oscillations and instability due to the proximity of input and output frequencies, leading to interference with sub-7 GHz communication systems and regulatory compliance issues, especially when using low intermediate frequency (IF) to RF conversion.
Innovation Solution
An RF architecture that eliminates IF to RF conversion by using a single wire interface at a millimeter wave frequency, allowing for co-running with sub-7 GHz systems and reducing unwanted emissions, utilizing a conversion circuitry to interface between baseband and RF circuitry without the need for phase locked loops (PLLs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If low intermediate frequency (IF) to RF conversion is used in millimeter wave transceivers, then device integration and co-running with sub-7 GHz systems are improved, but oscillation and instability issues worsen due to leakage feedback to RF IC interfaces
Solution Approach 1:
The patent introduces an intermediary frequency conversion stage between baseband and RF circuits. Instead of directly interfacing baseband with RF at millimeter wave frequencies, the system uses an intermediate frequency representation that breaks the direct feedback path, thereby preventing oscillation while maintaining integration benefits
Solution Approach 2:
The patent implements feedback control mechanisms to detect and suppress oscillation conditions. By monitoring the RF circuitry output and adjusting baseband processing accordingly, the system maintains stability while operating in integrated millimeter wave and sub-7 GHz modes
2Productivity
If millimeter wave frequencies are used for direct RF interfacing, then data throughput and connectivity demands are improved, but unwanted emissions and interference with sub-7 GHz systems worsen
Solution Approach 1:
The patent segments the frequency spectrum handling into distinct processing paths. Millimeter wave signals are processed separately from sub-7 GHz signals through dedicated baseband processing stages, preventing spectral overlap and unwanted emissions while maintaining high data throughput capabilities
Solution Approach 2:
The patent dynamically adjusts operating parameters such as frequency allocation, power levels, and modulation schemes based on detected interference conditions. When sub-7 GHz systems are active, the system modifies millimeter wave transmission parameters to minimize harmful emissions while preserving productivity
Data Source
AI summary
An apparatus for wireless transmissions and reception. The apparatus includes a radio frequency (RF) circuitry, a baseband circuitry, and a conversion circuitry. The RF circuitry is configured to transmit and receive a signal in an RF frequency. The baseband circuitry is configured to process a transmit signal or a receive signal in a baseband frequency. The conversion circuitry is configured to perform frequency conversion between the baseband and RF frequencies. The conversion circuitry is configured to convert a baseband signal received from the baseband circuitry to an RF signal in a first RF frequency if a transmit frequency is a second RF frequency or to the RF signal in the second RF frequency if the transmit frequency is the first RF frequency, and send the RF signal after frequency conversion to the RF circuitry. The RF circuitry converts the received RF signal to the transmit frequency for transmission.