Multi-Chip Front-End Digital Control Interface Without a Control Chip
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The high cost of front-end modules in heterogeneous multi-chip systems is exacerbated by increased chip numbers and technology types, which complicates module integration and packaging, and integrating technologies to reduce chip count often increases fabrication costs without significant cost reduction.
Innovation Solution
Implementing a digital control interface in a front-end module using separate functional blocks formed with different process types, such as pHEMT and HBT, without a dedicated control chip, allowing for digital control between these blocks via an interconnection circuit, thereby reducing chip count without sacrificing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate chips are used in heterogeneous multi-chip module to achieve specific functions with preferred technologies, then performance and cost competitiveness are improved, but module level integration complexity and packaging complexity increase
Solution Approach 1:
The patent combines the digital control interface function with the power amplifier chip by integrating CMOS circuitry directly into the HBT power amplifier chip. This merging eliminates the need for a separate control chip, thereby reducing packaging complexity and integration complexity while maintaining the performance benefits of heterogeneous technologies.
2Quantity of substance
If integrated technology is used to reduce chip count, then number of chips is reduced, but fabrication cost increases due to more process steps and larger mask counts
Solution Approach 1:
The patent creates a multi-functional chip that performs both power amplification (HBT function) and digital control (CMOS function) on a single chip. This universal approach allows the chip to fulfill multiple roles without requiring a separate dedicated control chip, thus reducing chip count while avoiding the high fabrication costs of fully integrated technologies.
Solution Approach 2:
The patent employs composite semiconductor technology by integrating HBT and CMOS circuits on the same chip. This composite approach combines the advantages of different semiconductor technologies (high performance of HBT and low power digital logic of CMOS) while avoiding the need for multiple separate chips, thereby reducing chip count without incurring the high costs of fully integrated processes.
3Ease of operation
If dedicated control chip is used to digitally control functional blocks, then control functionality is achieved, but chip count increases and packaging complexity increases
Solution Approach 1:
The patent merges the digital control interface function into the power amplifier chip itself by integrating CMOS control circuitry with the HBT power amplifier. This eliminates the need for a dedicated control chip, thereby maintaining full control functionality while significantly reducing packaging complexity and the number of chips required in the module.
Data Source
AI summary
A front-end module comprises a plurality of chips that includes first and second functional blocks and an interconnection circuit. The first functional block is formed using a first process type and includes a digital control circuit that generates a digital control signal in response to an external control signal from outside the front end module. The second functional block is formed using a second process type and includes a digitally controlled circuit controlled by the digital control signal generated by the first functional block. The second process type is different from the first process type. The interconnection circuit couples the digital control circuit and the digitally controlled circuit to provide the digital control signal to the digitally controlled circuit. In one aspect, the first functional block may be a low noise amplifier formed by a pseudomorphic high electron mobility transistor process. The second functional block may be a power amplifier formed by a heterojunction bipolar transistor process. In another aspect, the first functional block may be a power amplifier formed by a heterojunction bipolar transistor process. The second functional block may be a low noise amplifier formed by a pseudomorphic high electron mobility transistor process.