Edge-Triggered Transmitter Circuit to Cut Isolator EMI
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Solution Overview
Problem
Conventional isolation circuits face high power consumption and electromagnetic interference issues due to the continuous operation of oscillators, which also lead to jitter problems in signal transmission, and are costly and area-intensive.
Innovation Solution
A transmitter circuit architecture that replaces the conventional oscillator with a rising and falling converter, a delay and logic unit, and an AND gate, generating transmitter output signals based on data input signal transitions, thereby eliminating the need for oscillators and reducing power consumption and electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an oscillator is used in the transmitter structure to generate continuous pulse carriers, then signal transmission can be maintained, but power consumption increases tremendously and electromagnetic interference becomes severe
Solution Approach 1:
The patent replaces the continuous oscillator with a periodic pulse generation mechanism that operates only during data transitions. The transmitter generates pulses periodically based on edge detection of input data, rather than continuous oscillation, thereby reducing power consumption while maintaining signal transmission capability.
Solution Approach 2:
The patent extracts and removes the oscillator component from the transmitter structure entirely. By eliminating the continuous oscillating element and replacing it with a transition-based pulse generator, the system achieves signal transmission without the harmful continuous electromagnetic radiation and power consumption associated with traditional oscillators.
2Reliability
If an oscillator operates continuously to provide pulse carriers, then data transmission can occur, but electromagnetic interference issues become severe
Solution Approach 1:
The transmitter uses periodic pulse generation triggered only by data transitions rather than continuous oscillation. This reduces electromagnetic interference by limiting pulse generation to necessary moments only, while still achieving reliable data transmission through the isolation barrier.
Solution Approach 2:
The patent converts the potential harm of continuous oscillation into benefit by using transition-triggered pulsing. The edges of the input signal, which could be seen as simple transitions, are converted into useful timing references for generating isolated output pulses, achieving data transmission with minimal electromagnetic interference.
3Reliability
If an oscillator generates indefinite pulse carriers at all times, then signal coupling can be maintained, but jitter problems occur in TX output signals
Solution Approach 1:
The transmitter generates pulses periodically based on actual data transitions rather than continuous oscillation. This edge-triggered approach synchronizes pulse generation with meaningful signal changes, eliminating the jitter inherent in continuous oscillators while maintaining proper signal coupling across the isolation barrier.
4Reliability
If two pairs of transmitters and receivers are used for dual communication channels, then communication reliability is improved, but circuit production cost and area consumption increase
Solution Approach 1:
The transmitter circuit is designed with universal functionality that can operate in different modes. The same circuit architecture supports both single-channel and dual-channel configurations, allowing the system to achieve communication reliability through intelligent signal processing rather than simply duplicating hardware, thereby reducing circuit area consumption.
Data Source
AI summary
A transmitter circuit applicable to a digital isolator is provided, adapted to receive a data input signal and coupled to an isolation barrier, developing a receiver input signal to a receiver circuit for generating a data output signal. The transmitter circuit generates a transmitter output signal in response to a rising edge and falling edge of the data input signal, and includes a rising and falling converter for outputting a converted data input signal according to the rising edge and falling edge of the data input signal, a delay and logic unit for receiving the converted data input signal and generating a carrier signal, and an AND gate receiving the converted data input signal and the carrier signal, and outputting the transmitter output signal. Since a number of pulses of the carrier signal is limited and definite, the present invention achieves to reduce power consumption and electromagnetic interferences effectively.