Current Pulse Circuit With Adaptive Glitch Compensation
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Solution Overview
Problem
Existing circuits used for delivering current pulses to LEDs in optical communication systems suffer from glitches due to sudden changes in current flow, leading to optical distortion, which can cause signal loss and are not adequately addressed by current compensation methods, especially in varying operational conditions.
Innovation Solution
A supply circuit with a current source, reference voltage, current switch, and glitch compensation elements, including capacitors and a controller that dynamically adjusts the correcting voltage based on parameters such as supply voltage, temperature, and output drive current to effectively cancel out glitches by applying a charge of opposite polarity and equal magnitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current pulses are delivered to LED to enable optical communication, then data transmission is achieved, but optical distortion occurs due to glitches in the voltage source
Solution Approach 1:
The patent applies preliminary anti-action by injecting a compensating charge of opposite polarity to the glitch disturbance before it can cause optical distortion. The compensation circuit detects the glitch and applies a counteracting charge through a capacitor, preventing the distortion from occurring in the first place rather than correcting it afterward.
Solution Approach 2:
The patent converts the harmful glitch disturbance into a beneficial compensation signal. By detecting the glitch charge and injecting an equal and opposite compensating charge, the circuit transforms the harmful voltage fluctuation into a corrective action that eliminates the distortion and protects the optical signal integrity.
2Reliability
If known glitch compensation methods using inverting amplifiers are employed, then some glitch correction is achieved, but the compensation effectiveness is reduced under varying operational conditions
Solution Approach 1:
The patent applies dynamics by making the compensation circuit adaptive to varying operational conditions. The controller dynamically adjusts the compensation parameters based on detected circuit conditions, allowing the system to maintain effective glitch compensation across different temperatures, supply voltages, and load characteristics rather than relying on fixed compensation values.
Solution Approach 2:
The patent implements feedback by continuously monitoring the circuit operation and using this information to adjust the compensation signal. The controller detects the actual glitch conditions and feeds this information back to modify the compensating charge injection, creating a closed-loop system that maintains compensation effectiveness under varying conditions.
3Object-affected harmful factors
If larger capacitors are used to filter glitches, then glitch reduction is improved, but silicon area and circuit cost increase
Solution Approach 1:
The patent applies parameter changes by using a small capacitor in combination with active charge injection rather than relying on a large passive capacitor for filtering. The compensation circuit changes the approach from passive filtering to active compensation, injecting precise compensating charges that are equal and opposite to the glitch charges, thereby achieving effective glitch reduction with minimal silicon area.
4Reliability
If current mirror bandwidth is increased to improve voltage source robustness, then glitch resistance improves, but power consumption increases
Solution Approach 1:
The patent introduces an intermediary compensation circuit that mediates between the current mirror and the reference voltage source. Rather than increasing the current mirror bandwidth to improve robustness, the compensation circuit acts as an intermediary that detects and corrects glitches, thereby maintaining voltage source robustness without requiring increased power consumption from the current mirror.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly reduces optical distortion by ensuring precise control over the current pulses, maintaining signal integrity across varying conditions, and optimizing power usage without increasing silicon area or power requirements.
Implementation Method 1
glitch compensation elements including at least one capacitor and associated drive circuit for feeding a variable correcting voltage to the reference voltage source
Data Source
AI summary
A supply circuit for providing pulses of current has a current source, a reference voltage source for controlling magnitude of the current, and a current switch for controlling whether or not the current passes through a load. Also, there is a switch control signal terminal for controlling the current switch, and glitch compensation elements including at least one capacitance circuit and associated capacitor drive circuit for feeding a variable correcting voltage back to the reference voltage, and a controller to control said variable voltage.