Transceiving Circuit DC Bias Control via Frequency Domain Analysis
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Solution Overview
Problem
Conventional transceiving circuits face inefficiencies in calculating the ideal DC bias voltage for mixers, leading to long computing times and high costs due to the second-order nonlinear effects causing noise, which are not effectively addressed by binary search methods.
Innovation Solution
A transceiving circuit comprising a transmitting circuit, a receiving circuit, a frequency domain analyzing circuit, and a DC bias voltage generating circuit, where a test signal is used to generate multiple output signals at different DC bias voltage groups, transforming them into frequency domain signals to model a quadratic function, allowing for the computation of an ideal DC bias voltage group efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If binary search method is used to compute DC bias voltage, then the receiving circuit can operate, but the computing time is long and cost is high
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the relationship between DC bias voltage and noise level in a lookup table before actual operation. When the receiving circuit needs to operate, the system directly queries the pre-computed table rather than performing binary search in real-time, significantly reducing computing time while maintaining reliable operation.
Solution Approach 2:
The patent creates a simplified model (lookup table) that copies the essential relationship between DC bias voltage and noise characteristics. Instead of using the complex binary search algorithm during operation, the system uses this pre-created representation to quickly determine appropriate bias voltage settings, reducing computational burden while preserving the necessary functional relationship.
2Reliability
If binary search method is used to compute DC bias voltage, then the receiving circuit can operate, but the cost is high
Solution Approach 1:
The patent performs the expensive computation once during system initialization or manufacturing, storing the results in a lookup table. During normal operation, the system only needs to perform simple table queries, dramatically reducing the computational resources and associated costs required for maintaining reliable receiving circuit operation.
Solution Approach 2:
The patent replaces the expensive, computationally intensive binary search method with a cheap, simple lookup table approach. The lookup table acts as a disposable pre-computed resource that provides accurate results at minimal computational cost during operation, making the system more economically viable.
3Object-affected harmful factors
If DC bias voltage is adjusted to reduce noise, then noise can be reduced, but the computation for ideal voltage is complex
Solution Approach 1:
The patent creates a simplified copy of the complex relationship between DC bias voltage and noise level in the form of a lookup table. This table captures the essential characteristics without requiring complex computation, allowing the system to effectively reduce noise by simply querying pre-determined voltage values from the table.
Solution Approach 2:
The patent replaces the complex computational mechanism (binary search algorithm) with a simpler data retrieval mechanism (lookup table query). This substitution eliminates the need for iterative calculation and comparison operations, reducing computational complexity while maintaining the ability to determine optimal DC bias voltage for noise reduction.
Data Source
AI summary
A transceiving circuit, which comprises: a transmitting circuit, configured to transmit a test signal; a receiving circuit, comprising a mixer configured to receive a plurality of predetermined DC bias voltage groups, wherein the receiving circuit generates a plurality of output signals according to the test signal while the mixer operates at the predetermined DC bias voltage groups; a frequency domain analyzing circuit, configured to transform the output signals to a plurality of frequency domain signals; and a DC bias voltage generating circuit, configured to generate a function according to the frequency domain signals and the predetermined bias voltage groups, and configured to generate a first DC bias voltage group to the mixer according to the function.