Transformer Delay Circuit for Second-Harmonic Image Cancellation
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Solution Overview
Problem
Constructing a sharp reconstruction filter for high-frequency signals in the GHz range is difficult and costly, and existing methods fail to effectively diminish out-of-band frequency components, leading to signal distortion.
Innovation Solution
A method and device that reduces frequency components around twice the sampling frequency by using a transformer with a delay module to subtract delayed and non-delayed signals, allowing for a less sharp bandpass reconstruction filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sharp reconstruction filter is used to remove out-of-band frequency components, then signal quality is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies preliminary action by subtracting delayed samples from non-delayed samples before the reconstruction filter processes the signal. This pre-processing step removes out-of-band frequency components (images) early in the signal path, reducing the burden on the reconstruction filter and allowing it to be less sharp while still achieving good signal quality.
Solution Approach 2:
The patent introduces an intermediary processing step using a delay module and subtractor circuit. This intermediary mechanism processes the sampled signal by removing harmful frequency components before the final reconstruction filter, acting as a mediator that reduces the complexity requirement of the reconstruction filter while maintaining signal quality.
2Measurement precision
If the sampling frequency is increased to capture all frequency components, then signal accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent extracts and removes the harmful frequency components (images at twice the sampling frequency) from the sampled signal using the delay and subtractor mechanism. By taking out these unwanted components, the system can use lower sampling frequencies while still maintaining signal accuracy, thereby reducing energy consumption.
Solution Approach 2:
The patent converts the harmful effect of sampling (which creates unwanted frequency images) into a beneficial process. The delay module and subtractor are designed to specifically target and eliminate these image frequencies, turning the problematic sampling artifacts into a controlled removal process that enables lower sampling rates and reduced energy usage.
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
This approach significantly reduces the need for sharp reconstruction filters, improving signal-to-noise ratio and enabling efficient transmission of narrowband signals without requiring costly high-frequency filtering.
Implementation Method 1
a transformer with a delay module to subtract delayed and non-delayed signals
Data Source
AI summary
A device includes a port and a transformer. The transformer includes a first coil that has a first node and a second node and a second coil that is coupled to the output port. The device also includes a pulse generator coupled to the first node to generate two or more pulses with a first period on the first node and a delay module that is coupled between the second node of the first coil and the pulse generator. The delay module is generates a time delay to the two or more pulses of the pulse generator before the two or more pulses are delivered to the second node. The second coil provides a signal at the port.