Optical Isolation Amplifier Pulse Encoding for Accurate Sigma-Delta Decoding
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Solution Overview
Problem
Conventional optical isolation amplifiers employing sigma-delta modulation technology face challenges in accurately restoring a one-bit data stream due to pulse distortion and changes in rising and falling edges when the data stream passes through optical channels, leading to increased input offset voltage, decreased signal-to-noise ratio, and degraded linearity.
Innovation Solution
An encoding and decoding method is introduced, utilizing a dual-edge-triggered signal encoder and a rising-edge-triggered signal decoder, where the encoder generates pulses with a predetermined pulse width between 10% and 25% of the clock pulse width, ensuring accurate signal transmission through the optical channel, and the decoder duplicates the input signal based on detected pulses with similar distortion, thereby improving signal accuracy and linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional encoding and decoding method is used, then the optical isolation amplifier can transmit signals through optical channels, but pulse distortion and edge changes occur leading to inaccurate restoration of one-bit data stream
Solution Approach 1:
The encoder performs preliminary action by generating encoded pulses with predetermined widths (10%-25% of clock pulse width) before transmission through optical channels. This pre-encoding with controlled pulse widths compensates for expected distortion and edge changes that will occur during transmission, enabling accurate restoration at the decoder side
Solution Approach 2:
The invention changes the pulse width parameter of encoded signals to a specific range (10%-25% of clock pulse width) to optimize transmission through optical channels. This parameter optimization ensures that pulses maintain sufficient width despite distortion and edge changes during transmission, enabling accurate data stream restoration
2Productivity
If the one-bit data stream passes through optical channels with conventional encoding, then signal transmission is achieved, but pulse width changes and edge distortion occur
Solution Approach 1:
The encoder generates pulses with predetermined widths before transmission, performing preliminary action to compensate for expected distortion. This allows high-speed transmission while maintaining pulse width accuracy despite optical channel effects
Solution Approach 2:
The predetermined pulse width design (10%-25% of clock pulse width) provides a cushion against distortion and edge changes during transmission. By designing pulses with sufficient initial width, the system tolerates the expected degradation from optical channels while maintaining accurate data restoration
3Speed
If encoded pulses with narrow width are used to increase data rate, then transmission speed improves, but pulse distortion increases leading to decoding errors
Solution Approach 1:
The invention optimizes the pulse width parameter to a specific range (10%-25% of clock pulse width) that balances transmission speed and reliability. This parameter optimization ensures pulses are narrow enough for high data rates but wide enough to maintain accuracy through optical channels
Solution Approach 2:
By designing pulses with predetermined widths that account for expected distortion, the system provides a cushion against degradation. This allows use of narrower pulses for higher data rates while maintaining decoding accuracy through the optical channel
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 method enhances the accuracy of the output signal, reduces input offset voltage, and increases the signal-to-noise ratio of the optical isolation amplifier by ensuring precise restoration of the one-bit data stream, effectively addressing the issues of pulse distortion and edge changes.
Implementation Method 1
the light source 13 is driven by the encoded digital signal, and the light source 13 outputs an optical signal in response to the encoded digital signal
Implementation Method 2
The optical detector 14 senses the optical signal and converts the optical signal into another digital signal
Data Source
AI summary
An encoding and decoding method for an optical isolation amplifier including an encoder, an optical driver, a light source, an optical detector, and a decoder, and employing sigma-delta modulation technology is provided. The method includes: generating a plurality of first pulses, each having a predetermined pulse width, through the encoder when an input digital signal experiences an input pulse rising or falling edge; outputting an encoded signal having the plurality of first pulses to the optical driver; driving the light source through the optical driver, according to the plurality of first pulses, so as to output an encoded optical signal; generating a detected signal through the optical detector detecting the encoded optical signal, and the detected signal has a plurality of second pulses; and duplicating the input digital signal of the encoder through the decoder, according to the detected signal having the plurality of second pulses.