Multi-Channel Amplifier Phase Shifting for Lower EMI and Ripple
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Solution Overview
Problem
Existing amplification systems, such as those using Class-D amplifiers, face challenges in efficiently processing multiple input signals across multiple channels, leading to issues like large power supply ripples and electromagnetic interference.
Innovation Solution
The proposed system incorporates multiple channels with distinct phase-shifted ramp signals, allowing each channel to process input signals independently. This configuration includes loop filters, comparators, and logic controllers to generate output signals based on the processed information, effectively reducing electromagnetic interference and power supply ripples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple channels share a common ramp signal, then device complexity is reduced, but electromagnetic interference and power supply ripples increase
Solution Approach 1:
The patent divides the common ramp signal into separate phase-shifted ramp signals for each channel. Instead of sharing a single ramp signal across all channels, each channel receives its own ramp signal with a distinct phase shift, thereby segmenting the signal generation to reduce electromagnetic interference while maintaining manageable complexity through systematic phase distribution.
Solution Approach 2:
The patent introduces phase dimension to differentiate ramp signals across channels. By adding the phase angle as a new dimension of differentiation (0°, 60°, 120°, 180°, 240°, 300°), the system can maintain multiple channels with reduced interference without significantly increasing overall complexity, as the phase relationships follow a predictable pattern.
2Device complexity
If multiple channels share a common ramp signal, then device complexity is reduced, but power supply ripples increase
Solution Approach 1:
The patent segments the power draw across channels by providing each with a separately phased ramp signal. This segmentation of the timing and phase of operations prevents synchronized switching that causes large current transients, thereby reducing power supply ripples while keeping the system complexity manageable through structured phase distribution.
Solution Approach 2:
The patent employs periodic phase shifting across channels, where each channel operates with a ramp signal phased relative to others in a systematic periodic pattern (60° intervals). This periodic distribution of operational phases smooths out power supply demands over time, reducing ripple effects while maintaining regular, predictable system behavior.
3Object-generated harmful factors
If phase-shifted ramp signals are used, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The patent implements a universal phase-shifting mechanism that can be applied across multiple channels using the same underlying approach. A single phase-shifted ramp signal generation technique serves all channels, with each channel receiving appropriately phased signals according to a standard pattern, thereby reducing the need for entirely separate signal generation circuits for each channel and limiting complexity growth.
Data Source
AI summary
Systems and methods are provided for amplifying multiple input signals to generate multiple output signals. An example system includes a first channel, a second channel, and a third channel. The first channel is configured to receive one or more first input signals, process information associated with the one or more first input signals and a first ramp signal, and generate one or more first output signals. The second channel is configured to receive one or more second input signals, process information associated with the one or more second input signals and a second ramp signal, and generate one or more second output signals. The first ramp signal corresponds to a first phase. The second ramp signal corresponds to a second phase. The first phase and the second phase are different.