Phased-Array LO Synchronization Using U-Shaped Tap Lines
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Solution Overview
Problem
Conventional phased-array and multiple receiver/transmitter systems face challenges in achieving accurate phase synchronization of local oscillator signals across spatially separated antennas, leading to inefficiencies in chip area usage and phase shift inconsistencies due to distribution line lengths and coupling.
Innovation Solution
A phase synchronizer is implemented using a U-shaped transmission line with multiple taps, where each transceiver block receives two LO signals with different phase shifts from the taps, which are combined to generate a reference LO signal with a consistent phase shift, reducing the need for extensive distribution lines and minimizing chip area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distribution lines are used to send LO signals to each transceiver block, then phase synchronization can be achieved, but chip area increases significantly
Solution Approach 1:
Multiple LO signals with different phases are combined through addition at each transceiver block. The U-shaped transmission line provides multiple taps that generate LO signals with different phase shifts, and these are merged together to achieve the desired phase synchronization without requiring separate distribution lines for each phase
Solution Approach 2:
The U-shaped transmission line is segmented into multiple taps along its length, where each tap provides an LO signal with a different phase shift. This segmentation allows different phases to be generated along a single compact transmission line structure rather than requiring separate distribution lines for each phase
2Measurement precision
If equal length distribution lines are used to provide accurate phase, then phase accuracy is maintained, but chip area increases and coupling between lines alters phases
Solution Approach 1:
The U-shaped transmission line acts as an intermediary structure that generates multiple phase-shifted LO signals through its taps. Instead of using multiple separate distribution lines that require equal lengths and are susceptible to coupling, a single U-shaped transmission line provides all necessary phases through its segmented taps
Solution Approach 2:
The transmission line is configured in a U-shape, utilizing spatial dimensionality to create different path lengths from the LO source to various taps. This geometric arrangement naturally produces different phase shifts without requiring multiple parallel lines of equal length
3Area of stationary object
If taps on a transmission line are used to generate different phases, then chip area is reduced, but phase shift inconsistencies occur due to transmission line length
Solution Approach 1:
The system dynamically compensates for phase shifts by allowing each transceiver block to receive multiple LO signals with different phase shifts and combine them through addition. This dynamic combination process at each receiver enables accurate phase synchronization despite the varying phase shifts introduced by the transmission line taps
Data Source
AI summary
In one embodiment, a local oscillator (LO) is configured to generate an LO signal. A transmission line receives the LO signal from the local oscillator and transmits the LO signal. A first set of taps and a second set of taps tap the transmission line to receive the LO signal. A plurality of transceiver blocks are configured to receive and transmit a plurality of phase-shifted radio frequency signals. Each transceiver block is coupled to a first tap and a second tap. Each LO signal received for a transceiver block is received with a different phase. However, the same reference phase may be calculated from a first LO signal received from the first tap and a second LO signal received from a second tap. Each transceiver block receives the reference LO signal having the reference phase determined from the first LO signal and the second LO signal.