Serial Bus Buffer Noise Reduction via Active Signal Replication
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Solution Overview
Problem
Existing radio frequency front end (RFFE) architectures in wireless devices face challenges with high costs, circuit board space occupation, and energy efficiency due to the need for large filter components to reduce spurious signals, which increase the drive capability required by the master device.
Innovation Solution
A digital communication and control system with a serial bus buffer that includes a primary interface, a buffered interface, and a controller to replicate data and clock signals at desired drive levels, selectively driving sensitive regions with a tri-state function to minimize noise exposure without expensive filters, thereby reducing the need for large inductors, capacitors, and resistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If LC filter and RC filter are used to filter noise from SCLK and SDATA lines, then noise filtering performance is improved, but component cost increases due to large inductor and capacitor values
Solution Approach 1:
The patent introduces a buffer device as an intermediary component between the master device and slave devices. This buffer actively compensates for noise and signal degradation without requiring large passive filter components, thereby resolving the contradiction between achieving good noise filtering and maintaining low component cost
Solution Approach 2:
The patent replaces the traditional passive mechanical/electrical filter system (LC and RC filters requiring large inductors and capacitors) with an active electronic buffer system that achieves noise filtering through electronic signal regeneration and compensation, eliminating the need for bulky passive components
2Object-affected harmful factors
If LC filter and RC filter are used to filter noise, then noise attenuation is improved, but circuit board area occupied increases
Solution Approach 1:
The buffer device serves as an intermediary that provides noise compensation functionality without requiring the physical space of large passive filter components, thus achieving noise attenuation while minimizing circuit board area occupation
Solution Approach 2:
The patent substitutes the space-consuming passive filter components with a compact active buffer circuit that achieves the same noise attenuation function through electronic means, significantly reducing the required circuit board area
3Object-affected harmful factors
If high frequency filters with large capacitance values are used, then noise filtering is improved, but drive capability requirement for master device increases
Solution Approach 1:
The buffer acts as an intermediary that isolates the master device from the capacitive load of high frequency filters. It provides noise filtering compensation while presenting a lower capacitive load to the master device, thereby reducing the drive capability requirement
Solution Approach 2:
The patent replaces the direct connection between master device and high capacitance filters with an active buffer stage that electronically manages the capacitive load, enabling effective noise filtering without imposing excessive drive requirements on the master device
Data Source
AI summary
Disclosed is a digital communication control system having a serial bus buffer that includes a primary interface adapted to support serial communication over a primary bus, a buffered interface adapted to support serial communication over a buffered bus, and a controller coupled between the primary bus and the buffered bus. The primary bus is coupled to a first device and at least one second device and the buffered bus is coupled to at least one third device. The controller is adapted to receive a first data signal and a clock signal at the primary interface and replicate the first data signal and the clock signal at the buffered interface.