Digital Transmitter Combining Binary ΔΣ Paths for Higher SNR
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Solution Overview
Problem
Existing transmitters for communication and broadcasting equipment face challenges in achieving a high signal-to-noise power ratio without using multilevel class-D amplifiers, which require multiple power supplies, increasing costs and power consumption.
Innovation Solution
The proposed transmitter configuration includes two digital transmitters with binary class-D amplifiers and ΔΣ modulators, where different initial values are used for each transmitter, and their outputs are combined, allowing for improved signal-to-noise power ratio without the need for multiple power supplies, using a combiner to double the signal-to-noise power ratio and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a multilevel class-D amplifier is used to improve signal-to-noise power ratio, then the signal-to-noise power ratio is improved, but the device complexity and power consumption increase due to requiring multiple power supplies
Solution Approach 1:
The patent divides the system into multiple independent binary transmitters (first and second digital transmitters), each with its own binary class-D amplifier and ΔΣ modulator. By segmenting the system architecture rather than using a single multilevel amplifier, the patent achieves improved signal-to-noise power ratio through combination of multiple binary outputs without requiring multiple power supplies within a single amplifier unit.
Solution Approach 2:
The patent combines the output signals from multiple binary class-D amplifiers using a combiner to achieve the signal-to-noise power ratio improvement. This merging approach allows the system to attain the benefits of multilevel operation while maintaining the simplicity of binary amplifiers with single power supplies.
2Measurement precision
If a multilevel class-D amplifier is used to improve signal-to-noise power ratio, then the signal-to-noise power ratio is improved, but the power consumption increases
Solution Approach 1:
The patent segments the amplification function across multiple binary class-D amplifiers, each consuming power from a single common power supply. This segmentation allows the system to achieve improved signal-to-noise power ratio through signal combination rather than through high-power multilevel amplification, thereby reducing overall power consumption.
Solution Approach 2:
The patent changes the operational parameters from multilevel voltage levels to binary levels, operating all amplifiers from a single common power supply voltage. This parameter change simplifies the power supply architecture while achieving the desired signal-to-noise power ratio through the combination of multiple binary signals with different initial values.
3Measurement precision
If binary class-D amplifiers with different initial values are combined to improve signal-to-noise power ratio, then the signal-to-noise power ratio is improved, but the device complexity increases due to requiring multiple transmitters
Solution Approach 1:
The patent uses a combiner to merge the output signals from multiple binary digital transmitters into a single combined output. This merging process achieves the signal-to-noise power ratio improvement while presenting a unified interface to the antenna, thereby managing the device complexity through modular architecture rather than monolithic design.
Solution Approach 2:
The patent creates multiple binary transmitters that are functionally identical but operate with different initial values. This universality allows the system to achieve improved signal-to-noise power ratio through diversity combining while maintaining simplicity in each individual transmitter unit, with all units drawing from a common power supply.
Data Source
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AI summary
A transmitter includes: multiple digital transmitters which perform delta-sigma modulation on the same baseband signal; a combiner that combines the output signals from the plural digital transmitters and outputs the combined result; a control unit that generates an external signal different for every digital transmitter, to be supplied to each of the digital transmitters; and, an input means that supplies the different external signal for every digital transmitter, to the input terminal or the internal node of a delta-sigma modulator that performs the delta-sigma modulation, the delta-sigma modulator being provided for every digital transmitter.