IC Regulator Current Shunting for Low-Noise Voltage Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrated circuits (ICs) face challenges in maintaining stable operation in the presence of noise, particularly in safety-critical applications where load current variations lead to undesirable emissions, which are difficult to manage with existing shunt regulators and bypass capacitors.
Innovation Solution
An IC regulator design incorporating a pass element and a buffer that maintains a constant current independent of load conditions, shunting excess current to reduce emissions, thereby eliminating the need for bypass capacitors and ICC controllers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shunt regulator is used to generate regulated voltage, then the regulator can adjust input current to maintain regulated output voltage, but load current variations directly affect ICC current causing noise emissions
Solution Approach 1:
The patent segments the current path by introducing a dedicated bypass capacitor current path that is separate from the load current path. The bypass capacitor is connected in parallel with the load, creating an independent current loop that allows bypass current to flow independently of load variations, thereby decoupling ICC emissions from load current changes while maintaining regulated voltage stability.
2Object-generated harmful factors
If bypass capacitors are added to filter high frequency noise, then noise emissions are reduced, but circuit area and cost increase
Solution Approach 1:
The bypass capacitor serves multiple functions simultaneously: it filters high-frequency noise, provides local energy storage to reduce supply current ripple, and decouples the load current from the regulator input current. This multi-functionality allows the circuit to achieve noise reduction without requiring additional separate components, thereby minimizing circuit area while effectively reducing ICC emissions.
3Adaptability or versatility
If the IC is located at a significant distance from the power supply, then long electrical interconnections are required, but these interconnections pick up and emit noise
Solution Approach 1:
The bypass capacitor acts as an intermediary element between the power supply and the load. By placing the bypass capacitor close to the load, it provides a local low-impedance path for high-frequency currents, preventing these currents from traveling through long interconnection traces. This intermediary component effectively isolates the noise-prone transmission paths while maintaining placement flexibility.
Data Source
AI summary
An integrated circuit (IC) regulator includes a pass element and a buffer. The pass element has an input terminal coupled to the regulator input, an output terminal coupled to the regulator output, and a control terminal and the buffer has an output coupled to the regulator output. A pass element current between the input terminal and output terminal is independent of the load current associated with a functional circuit of the IC and the buffer is configured to shunt any portion of the pass element current that is greater than the load current.