Extracting Clock Signals from RF Front-End Serial Bus
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Solution Overview
Problem
In RF front-end circuitry, the need for an accurate clock source for analog-to-digital conversion, digital-to-analog conversion, calibration, and sensor measurements often requires additional circuitry or external connections, increasing complexity and pin counts, which can be minimized by extracting clock information from a serial communications bus.
Innovation Solution
The RF front-end circuitry extracts clock information from a serial communications bus, eliminating the need for integral or external clock sources by utilizing the clock information embedded in serial communications commands, thereby reducing complexity and pin counts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate clock source circuitry or external clock connections are used, then accurate clock signals are provided for ADC, DAC, calibration, and sensor measurements, but device complexity and pin counts increase
Solution Approach 1:
The serial communications bus is designed to perform multiple functions: it transfers data between circuit elements and simultaneously provides clock signals for ADC, DAC, calibration, and sensor measurements. This multi-functionality eliminates the need for separate dedicated clock source circuitry, reducing device complexity and pin counts while maintaining reliable clock signal delivery.
Solution Approach 2:
The patent combines data transmission and clock signal delivery into a single serial communications bus interface. By merging these two previously separate functions into one unified communication channel, the system reduces the number of required connections and circuit elements while ensuring accurate clock signals are available for all timing-critical operations.
2Reliability
If separate clock source circuitry or external clock connections are used, then accurate clock signals are provided for ADC, DAC, calibration, and sensor measurements, but pin counts increase
Solution Approach 1:
The serial communications bus is designed to perform multiple functions: it transfers data between circuit elements and simultaneously provides clock signals for ADC, DAC, calibration, and sensor measurements. This multi-functionality eliminates the need for separate dedicated clock source circuitry, reducing device complexity and pin counts while maintaining reliable clock signal delivery.
Solution Approach 2:
The patent combines data transmission and clock signal delivery into a single serial communications bus interface. By merging these two previously separate functions into one unified communication channel, the system reduces the number of required connections and circuit elements while ensuring accurate clock signals are available for all timing-critical operations.
3Device complexity
If fewer digital signals are used in serial communications, then circuit element connections are reduced, but clock signal availability for timing-critical operations may be compromised
Solution Approach 1:
The serial communications bus is designed to perform multiple functions: it transfers data between circuit elements and simultaneously provides clock signals for ADC, DAC, calibration, and sensor measurements. This multi-functionality eliminates the need for separate dedicated clock source circuitry, reducing device complexity and pin counts while maintaining reliable clock signal delivery.
Solution Approach 2:
The patent combines data transmission and clock signal delivery into a single serial communications bus interface. By merging these two previously separate functions into one unified communication channel, the system reduces the number of required connections and circuit elements while ensuring accurate clock signals are available for all timing-critical operations.
Data Source
AI summary
The present disclosure relates to RF front-end (RFFE) circuitry that includes multiple RFFE circuits, each of which may be provided by a separate integrated circuit (IC), front-end module, or both. As such, the RFFE circuits may be connected to one another using an RFFE serial communications bus. Further, one or more of the RFFE circuits may need an accurate clock source for analog-to-digital conversion (ADC), digital-to-analog conversion (DAC), calibration, sensor measurements, or the like. Instead of including an integral clock source circuit or receiving a separate external clock signal, an RFFE circuit may extract clock information from the RFFE serial communications bus to provide one or more clock signals. The clock information may be associated with one or more serial communications commands via the RFFE serial communications bus, may be associated with alternate functionality of the RFFE serial communications bus, or both.