Common Local Oscillator Chip With Multiplexed Cascading Port
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Solution Overview
Problem
Traditional cascading schemes of local oscillators in millimeter wave communication and radar systems require multiple chips and extensive signal pads, leading to increased chip area and cost.
Innovation Solution
A common local oscillator chip design that includes a local oscillator module, driving module, multiplexing matching network, local oscillator selection module, output matching network, and multiplexing transmission port, allowing for the cascading of two chips with a common local oscillator using only one signal port and matching network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cascading scheme with two sets of signal pads and matching networks is used, then local oscillator signal can be transmitted, but chip area and cost increase
Solution Approach 1:
The multiplexing transmission port is designed to serve dual functions: it can transmit the internal local oscillator signal to external devices and simultaneously receive external local oscillator signals for cascading with other chips. This multi-functional design eliminates the need for separate dedicated pads, reducing chip area while maintaining full transmission capability
Solution Approach 2:
The patent combines the transmit and receive functions into a single multiplexing transmission port and matching network. By merging these functions and using time-division or frequency-division multiplexing, the system achieves the same signal transmission capability with fewer physical components, thereby reducing chip area
2Reliability
If traditional cascading scheme with two sets of matching networks is used, then signal matching can be achieved, but chip area and cost increase
Solution Approach 1:
The multiplexing matching network is designed to perform multiple matching functions: it can match the internal local oscillator signal for external transmission and simultaneously match external received signals for internal processing. This single multi-functional matching network replaces the traditional two separate matching networks, reducing chip area while maintaining signal matching performance
Solution Approach 2:
The patent merges the output matching network and input matching network into a single multiplexing matching network. By combining these functions and using switching or filtering techniques, the system achieves proper signal matching with reduced component count and smaller chip area
3Reliability
If traditional cascading scheme with two sets of pads and matching networks is used, then connection reliability is maintained, but manufacturing cost increases
Solution Approach 1:
The multiplexing transmission port and matching network are designed to handle both transmit and receive operations reliably through a single integrated structure. This reduces the total number of components that need to be manufactured and assembled, lowering manufacturing costs while maintaining connection reliability through careful RF design
Solution Approach 2:
By merging multiple functions into single components (multiplexing transmission port and matching network), the patent reduces component count and assembly steps. This simplification directly reduces manufacturing cost while the integrated design maintains reliable connections through optimized signal paths
Data Source
AI summary
A common local oscillator chip, cascading structure, and method; the common local oscillator chip includes a local oscillator module, driving module, multiplexing matching network, local oscillator selection module, output matching network, and multiplexing transmission port. The local oscillator module provides an internal local oscillator signal; the driving module is connected to the local oscillator module, transmits the internal local oscillator signal when activated; the multiplexing matching network is connected to the driving module, outputs the internal local oscillator signal through the multiplexing transmission port, or receives an external local oscillator signal through the multiplexing transmission ports; the local oscillator selection module is connected to the local oscillator module and the multiplexing matching network, the local oscillator selection module is configured to select one of the internal local oscillator signal and external local oscillator signal, the chip local oscillator signal is generated through the output matching.