Balanced Transconductor Filter Compensation Without Even-Order Harmonics
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Solution Overview
Problem
Existing electronic filters with unbalanced structures face challenges in tunable loss compensation, as cross-coupled transistors used for balanced structures generate undesirable even-order harmonics, distorting the frequency response.
Innovation Solution
A system employing a combination of cross-connected and self-connected balanced transconductors provides tunable balanced loss compensation, adjusting transconductances to compensate both balanced and unbalanced losses across the electronic filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If cross-coupled transistors are used for loss compensation in an unbalanced structure, then loss compensation is achieved, but even-order harmonics are generated causing frequency response distortion
Solution Approach 1:
The invention divides the loss compensation function into two separate circuits: a balanced loss compensation circuit and an unbalanced loss compensation circuit. This segmentation allows each circuit to handle specific types of losses independently, preventing the generation of even-order harmonics while achieving comprehensive loss compensation.
Solution Approach 2:
The invention introduces a transformer as an intermediary element to couple the balanced and unbalanced loss compensation circuits. The transformer enables energy transfer between the circuits while maintaining isolation, allowing loss compensation without direct coupling that would generate harmonics.
2Reliability
If loss compensation is made tunable to adjust for process and temperature variations, then frequency response quality is improved, but device complexity increases
Solution Approach 1:
The invention implements tunable loss compensation by changing the transconductance parameters of the transconductors through bias voltage control. This allows dynamic adjustment of compensation levels to match process and temperature variations without adding complex switching or reconfiguration mechanisms.
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 effectively mitigates loss variations, ensuring improved frequency response quality by eliminating even-order harmonics and allowing for adjustable loss compensation, thereby enhancing the performance of unbalanced electronic filters.
Implementation Method 1
A system employing a combination of cross-connected and self-connected balanced transconductors provides tunable balanced loss compensation, adjusting transconductances to compensate both balanced and unbalanced losses across the electronic filter
Data Source
AI summary
The invention provides a system for providing tunable balanced loss compensation in an electronic filter. Tunable balanced loss compensation is provided by using cross-connected balanced transconductors and self-connected balanced transconductors. The cross-connected balanced transconductors and the self-connected transconductors compensate the unbalanced loss across the electronic filter. The self-connected balanced transconductors compensate the balanced loss across the electronic filter. Further, the cross-connected and the self-connected balanced transconductors are tunable by adjusting the values of their transconductances, thereby providing tunable balanced loss compensation.