Differential Amplifier BIMI Circuit for Single-Ended Conversion
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Solution Overview
Problem
Conventional differential to single-ended converters, such as BALUNs, incur energy losses and occupy significant space on printed circuit boards, limiting design efficiency and increasing costs due to multiple energy transferences and bulk physical presence.
Innovation Solution
A balanced/unbalanced inductor (BIMI) arrangement using a transistor pair and a tank circuit with a first inductor and capacitors directly converts differential signals to single-ended signals, eliminating the need for additional chip area and reducing energy transferences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a BALUN is used for differential to single-ended conversion, then the conversion function is achieved, but the device occupies significant space on the printed circuit board
Solution Approach 1:
The patent combines the differential pair transistors and the inductor-based BALUN function into a single integrated circuit structure. The inductors are directly coupled to the transistor drains, eliminating the need for separate external BALUN components and reducing overall footprint while maintaining conversion capability.
2Ease of operation
If a BALUN is used for differential to single-ended conversion, then the conversion function is achieved, but energy losses increase due to multiple energy transferences
Solution Approach 1:
The patent achieves continuous energy transfer from the differential signal through the transistor pair directly to the inductor network and output, minimizing discrete conversion stages. The direct coupling and magnetic coupling between inductors maintain energy continuity, reducing losses associated with multiple separate energy transference events.
3Ease of operation
If a BALUN is used for differential to single-ended conversion, then the conversion function is achieved, but the device cost increases
Solution Approach 1:
The patent integrates the BALUN functionality directly into the differential amplifier circuit, combining multiple functions (amplification and differential-to-single-ended conversion) into a single circuit block. This integration reduces component count, assembly complexity, and overall manufacturing cost while maintaining conversion capability.
4Ease of operation
If a BALUN is used for differential to single-ended conversion, then the conversion function is achieved, but the device complexity increases
Solution Approach 1:
The patent designs the circuit to perform multiple functions: the transistor pair provides differential amplification while the coupled inductors simultaneously provide both the BALUN transformation and impedance matching. This multi-functionality reduces the need for separate dedicated components, simplifying the overall device architecture.
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 reduces signal loss and eliminates the need for a BALUN, achieving efficient single-ended signal conversion with reduced footprint and lower energy transfer inefficiencies, while maintaining performance across a wide frequency band.
Implementation Method 1
a second inductor magnetically coupled to the first inductor to form a balanced/unbalanced inductor (BIMI) arrangement
Data Source
AI summary
Various embodiments for converting a differential signal to a single ended signal are disclosed. The embodiments comprise a transistor pair for receiving a differential signal; and a tank circuit coupled to the transistor pair. The tank circuit includes a first inductor and one or more capacitors. The embodiments also include a second inductor magnetically coupled to the first inductor to form a balanced/unbalanced inductor (BIMI) arrangement. The BIMI arrangement directly converts the differential signal to a single ended signal.