Electric Control Device With Opposite Phase Clock Signals
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Solution Overview
Problem
Electric control devices using delta-sigma modulators face interference issues due to high-frequency clock signals, which can exceed permissible limits, impairing performance and requiring measures to minimize interference emissions.
Innovation Solution
An electric control device with two delta-sigma modulators receiving clock signals of opposite phases, reducing interference emissions by forming groups with complementary clock signals and using a single line for each clock signal transmission, thereby offsetting interference and lowering clock rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high-frequency clock signal is transmitted to the delta-sigma modulator, then the conversion performance is improved, but interference emissions exceed permissible limits
Solution Approach 1:
The system divides the clock signal transmission into two separate channels (first electrical line and second electrical line) with opposite phases, segmenting the single high-frequency clock signal into two complementary signals that are transmitted separately to different delta-sigma modulators
Solution Approach 2:
The patent converts the harmful interference emissions into a beneficial effect by using opposite-phase clock signals whose interference patterns cancel each other out through destructive interference, transforming the harmful radiation into a noise-reduction mechanism
2Object-generated harmful factors
If differential transmission is used for clock signals, then interference emissions are reduced, but wiring complexity and space requirements increase
Solution Approach 1:
The patent merges the clock signal transmission for multiple delta-sigma modulators into a single-phase system with opposite-phase signals, combining multiple transmission channels into a simplified architecture that uses standard single-ended connections rather than complex differential pairs
Data Source
AI summary
An electric control device includes a first delta sigma modulator having a clock input connection, a second delta sigma modulator having a clock input connection, and an evaluation unit. The evaluation unit includes a first clock output connection which is connected to the clock input connection of the first delta sigma modulator by a first electrical cable, and a second clock output connection which is connected to the clock input connection of the second delta sigma modulator by a second electrical cable. The evaluation unit is designed to generate a clock signal (CLK1) at the first clock output connection (7) in phase opposition to a clock signal (CLK2) at the second clock output connection (9).