Switchable LO Input Mixer Layout for Multi-Channel PCB Routing
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Solution Overview
Problem
Conventional integrated circuit (IC) mixers with a single local oscillator (LO) input pin pose challenges in multi-channel devices and transceivers, as they require routing the LO signal around or under the IC, leading to suboptimal physical layouts and increased electromagnetic interference, due to the need for a common LO signal across multiple channels.
Innovation Solution
The design of IC mixers with switchable local oscillator inputs, where two LO inputs are located on opposite sides of the mixer, allowing for internal switching between them based on the desired frequency band, improving the physical layout by enabling direct connection without the need for complex routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single local oscillator input pin is used in conventional IC mixers, then the device complexity is reduced, but the ease of operation deteriorates due to suboptimal physical layout and complex routing requirements
Solution Approach 1:
The single local oscillator input is segmented into two separate local oscillator input pins located on opposite sides of the IC package. This segmentation allows the local oscillator signal to be routed directly to the mixer core without complex routing around or under the IC, thereby improving physical layout and reducing routing complexity simultaneously.
2Object-affected harmful factors
If the local oscillator signal is routed around the integrated circuit or to a different layer, then the device complexity is reduced, but the object-affected harmful factors increase due to electromagnetic interference
Solution Approach 1:
By providing two local oscillator input pins on opposite sides of the IC package, the signal path is shortened and direct routing becomes possible. This eliminates the need to route the local oscillator signal around or under the IC through vias to different layers, thereby reducing electromagnetic interference while maintaining simple routing structure.
3Adaptability or versatility
If conventional IC mixers with single LO input are used in multi-channel devices, then the device complexity is reduced, but the adaptability deteriorates due to suboptimal physical layout for multiple channels
Solution Approach 1:
The segmentation of the single LO input into two separate inputs on opposite sides of the IC package enables better adaptability for multi-channel devices. Each mixer can be independently configured with optimal signal routing, allowing flexible arrangement of multiple channels on the circuit board without requiring complex shared routing configurations.
Solution Approach 2:
The dual local oscillator input configuration provides universal applicability across different multi-channel device architectures. The same IC mixer type can be used in various channel configurations (in-phase, quadrature, parallel channels) by simply connecting the local oscillator signal to the appropriate input pin, enhancing versatility without increasing device complexity.
Data Source
AI summary
A mixer apparatus (60), such as an integrated circuit (IC) mixer is provided for improving the physical layout of devices containing mixers. The mixer includes a multiplier (62) with an input port (64), an output port (66), a first switchable local oscillator input port (68) and a second switchable local oscillator input port (72). The dual switchable local oscillator ports are located on either side of the mixer, between the input side and the output side. The dual switchable local oscillator ports allow the mixer to provide more flexibility in integrated circuit and printed circuit board design layouts involving mixer apparatus. For example, in dual channel devices, a local oscillator can be coupled to a pair of the mixers using transmission lines that do not have to be routed around the integrated circuit, to a different level of the printed circuit board or underneath one of the mixers.