Split-Steer Amplifier With Invertible Output for MIMO Radar
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Solution Overview
Problem
Current multi-input, multi-output (MIMO) radar systems using binary phase-shift keying (BPSK) modulator circuits face limitations in time-division multiplexing (TDM) and code-division multiplexing (CDM) efficiency, particularly in reducing system size and cost while maintaining performance.
Innovation Solution
The development of split-steer amplifiers with invertible outputs for use in multi-input downconversion mixers and systems, featuring a transistor arrangement that enables polarity inversion and quiescent current biasing, allowing for efficient operation in both TDM and CDM modes without the need for conventional BPSK modulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional BPSK modulator circuits are used in MIMO radar systems, then time-division multiplexing and code-division multiplexing can be implemented, but system size and cost increase
Solution Approach 1:
The patent extracts the BPSK modulation functionality from a separate modulator circuit and integrates it directly into the amplifier circuit itself. The amplifier's output transistors are configured to inherently provide phase inversion capability, eliminating the need for a dedicated BPSK modulator circuit while maintaining both TDM and CDM functionality.
Solution Approach 2:
The patent merges the amplifier function and BPSK modulation function into a single integrated circuit. The output stage of the amplifier uses transistor arrangements that can be switched between normal and inverted states, combining signal amplification and phase modulation in one component, thereby reducing overall system size and component count.
2Adaptability or versatility
If conventional BPSK modulator circuits are used in MIMO radar systems, then time-division multiplexing and code-division multiplexing can be implemented, but system cost increases
Solution Approach 1:
The patent merges the amplifier function and BPSK modulation function into a single integrated circuit. The output stage of the amplifier uses transistor arrangements that can be switched between normal and inverted states, combining signal amplification and phase modulation in one component, thereby reducing overall system size and component count.
Solution Approach 2:
The amplifier circuit is designed to perform multiple functions: signal amplification, phase inversion for BPSK modulation, and support for both TDM and CDM operating modes. This multi-functionality eliminates the need for separate dedicated circuits, reducing component count and system cost while maintaining full adaptability.
3Measurement precision
If split-steer amplifier with invertible output is used, then spatial resolution is doubled in CDM mode, but system complexity increases
Solution Approach 1:
The patent employs output transistors configured in an inverted arrangement where the normal and inverted output states are achieved by switching the polarity of the transistor connections. This inversion technique enables CDM functionality that doubles spatial resolution while keeping the circuit implementation straightforward through controlled polarity switching.
Data Source
AI summary
A split-steer amplifier with an invertible phase output, includes a first transistor having its base coupled to a positive node of an input port, its emitter coupled to ground, and collector connected to a positive intermediate node; a second transistor having its base coupled to a negative node of the input port, its emitter coupled to ground, and collector connected to a negative intermediate node; and multiple output ports each having a transistor arrangement operable to couple a positive node of that output port to the positive intermediate node and a negative node of that output port to the negative intermediate node, operable to couple the positive node of that output port to the negative intermediate node and the negative node of that output port to the positive intermediate node, and operable to decouple the positive node and the negative node of that output port from the intermediate nodes.