Simplified Serial Interface for RF Front End Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing serial interfaces for radio frequency front ends (RFFE) in electronic devices consume significant resources, lead to increased die complexity, and result in routing complexity and RF performance issues, particularly with flip chip style dies and MIPI RFFE interfaces.
Innovation Solution
A communications interface device with a radio frequency front end (RFFE) that includes a serial interface with a transmit block and a clock generator, providing a second clock signal when data is transmitted, reducing resource consumption and eliminating the need for additional slave addresses, register mapping tables, and pins, and using a simplified three-wire serial interface to communicate with downstream devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standard GPIO interfaces or MIPI RFFE interfaces are used to control additional peripheral devices, then control capability is improved, but die area and routing complexity increase significantly
Solution Approach 1:
The patent implements a universal serial interface architecture where a single transmit block can serve multiple receive blocks, and a single clock generator provides timing for the entire interface. This multi-functional design allows the same hardware resources to control multiple peripheral devices through different receive blocks, eliminating the need for separate control interfaces for each device and thereby reducing die area and routing complexity while maintaining versatile control capability
Solution Approach 2:
The patent merges multiple interface functions into shared hardware resources. Specifically, multiple receive blocks share a common transmit block and a common clock generator. This consolidation reduces the total number of separate interface circuits needed, directly reducing die area consumption and simplifying routing while still providing control over multiple peripheral devices through the shared architecture
2Adaptability or versatility
If MIPI RFFE interface is added to each peripheral device, then control functionality is improved, but die complexity and cost increase
Solution Approach 1:
The patent creates a universal control architecture where the transmit block and clock generator serve multiple peripheral devices through different receive blocks. This allows control functionality to be extended to multiple devices without replicating the entire interface circuitry at each device, thereby reducing die complexity and cost while maintaining full control functionality across all peripherals
Solution Approach 2:
Instead of copying the complete MIPI RFFE interface to each peripheral device, the patent implements receive blocks that can be individually enabled to receive data from the shared transmit block. This selective copying approach provides the necessary interface functionality at each device without the full overhead of a complete interface implementation, reducing overall die complexity and cost
3Adaptability or versatility
If GPIO signals are increased to control more devices, then control range is improved, but signal corruption by RF signals increases
Solution Approach 1:
The patent replaces the traditional GPIO mechanical/electrical interface system with a serial communication system that uses a dedicated transmit block, receive blocks, and clock generator. This substitution creates a more robust communication pathway that is less susceptible to RF signal corruption compared to standard GPIO interfaces, while still providing control over multiple peripheral devices through the serial interface architecture
Data Source
AI summary
A simplified serial interface for a communications device. The serial interface includes an RF front end and a transmit block and at least one receive block located on different dies. The receive block is activated by a clock generator that is separate than the system clock. The at least one receive block can inhibit transmission of an enable signal to the receive block and inhibit operation of an oscillator of the interface.