Split-Steer Amplifier With Invertible Outputs for MIMO Phase Multiplexing
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Solution Overview
Problem
Current multi-input, multi-output (MIMO) radar systems using binary phase-shift keying (BPSK) modulator circuits for time-division multiplexing (TDM) and code-division multiplexing (CDM) face limitations in efficiency and size, particularly in providing effective phase inversion and multiplexing capabilities.
Innovation Solution
The introduction of split-steer amplifiers with invertible outputs, comprising specific transistor arrangements and biasing mechanisms, enables efficient phase inversion and multiplexing in MIMO systems, allowing for smaller and more effective radar systems by eliminating the need for conventional BPSK modulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional BPSK modulator circuits are used for TDM and CDM in MIMO radar systems, then phase inversion and multiplexing capabilities are provided, but the system size and complexity increase
Solution Approach 1:
The patent combines the BPSK modulation functionality, phase inversion capability, and multiplexing operations into a single integrated split-steer amplifier circuit. The amplifier simultaneously performs signal amplification, phase inversion (through its differential output structure), and multiplexing (by selectively enabling different output ports), thereby eliminating the need for separate BPSK modulator circuits and reducing overall system complexity
Solution Approach 2:
The split-steer amplifier is designed as a universal circuit that can perform multiple functions: it provides signal amplification, phase inversion, time-division multiplexing, and code-division multiplexing capabilities all within one device. The amplifier's differential output structure and selective port enabling allow it to replace multiple specialized circuits, reducing system size while maintaining full functionality
2Reliability
If multiple output ports are enabled simultaneously in the split-steer amplifier, then measurement diversity is maintained, but quiescent current consumption increases
Solution Approach 1:
The amplifier employs dynamic biasing where the quiescent current is adjusted based on the number of enabled output ports. The biasing circuit responds to the operational state of the amplifier, providing higher current when multiple ports are enabled to maintain measurement diversity, and reducing current when fewer ports are active, thereby optimizing energy consumption according to actual operational requirements
Solution Approach 2:
The amplifier changes its electrical parameters (specifically quiescent current) based on the number of enabled output ports. When m output ports are enabled, the amplifier provides quiescent current of m*I0, where I0 is the base current unit. This parameter adaptation allows the system to maintain measurement diversity when needed while reducing power consumption during normal operation
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.