Push-Pull Amplifier RC Matching for On-Chip Carrier Separation
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Solution Overview
Problem
Existing communication devices face challenges in efficiently separating component carriers within the same band for carrier aggregation, leading to increased chip size, board area, and losses due to the need for off-chip power splitters.
Innovation Solution
A push-pull amplifier with adjustable RC impedance matching circuits and transistors, allowing for efficient separation of component carriers within the receiver chip, eliminating the need for external power splitters and reducing noise and losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If off-chip power splitters are used to separate component carriers, then carrier separation is achieved, but chip size and board area increase
Solution Approach 1:
The power splitter function is extracted from the off-chip domain and integrated into the LNA circuitry on-chip. The patent implements carrier separation by integrating impedance matching networks and switching mechanisms directly within the LNA block, eliminating the need for external power splitters and reducing board area requirements.
Solution Approach 2:
The patent combines multiple functions (low-noise amplification, impedance matching, and carrier separation) into a single integrated LNA circuit block. The impedance matching networks are merged with the amplifier stages, and the carrier separation function is integrated through switching mechanisms controlled by pilot tones, achieving multiple objectives in one unified circuit.
2Adaptability or versatility
If off-chip power splitters are used to separate component carriers, then carrier separation is achieved, but losses increase
Solution Approach 1:
The power splitter function is extracted from the off-chip domain and integrated into the LNA circuitry on-chip. The patent implements carrier separation by integrating impedance matching networks and switching mechanisms directly within the LNA block, eliminating the need for external power splitters and reducing board area requirements.
Solution Approach 2:
The patent uses pilot tones as intermediary signals to control the switching mechanisms for carrier separation. These pilot tones modulate the LNA gain selectively for different carriers, enabling precise carrier separation without requiring physical power splitters that would introduce insertion losses.
3Adaptability or versatility
If off-chip power splitters are used to separate component carriers, then carrier separation is achieved, but noise increases
Solution Approach 1:
The patent uses pilot tones as intermediary signals to control the switching mechanisms for carrier separation. These pilot tones modulate the LNA gain selectively for different carriers, enabling precise carrier separation without requiring physical power splitters that would introduce insertion losses.
Solution Approach 2:
The patent applies preliminary impedance matching through integrated RC networks before the signal reaches the amplifier stages. This preliminary matching optimizes signal transfer and minimizes reflections and noise early in the signal path, preventing noise degradation before amplification occurs.
Data Source
AI summary
A push-pull amplifier includes an amplifier input, a push amplifier stage, a pull amplifier stage and an inverting amplifier output.