Radio Communication Apparatus Mixer Capacitor Integration
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Solution Overview
Problem
Current radio communication systems using the direct conversion method require multiple filter parts to handle multiple frequency bands, leading to increased complexity and size, which hinders miniaturization and precision in multiband capabilities.
Innovation Solution
A radio communication apparatus is designed with a low-noise amplifier section and a mixer section that includes capacitors to separate in-phase and quadrature components, eliminating the need for filter parts by integrating the receiving circuit into a single chip, using differential pairs of transistors and cascode-connected transistors to reduce noise and secondary distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple filter parts are used to handle multiple frequency bands, then multiband capability is achieved, but device complexity and size increase
Solution Approach 1:
The patent combines multiple filter functions into a single integrated filter circuit that can process multiple frequency bands simultaneously. The filter circuit includes multiple filter elements connected in a specific configuration that enables it to perform filtering operations for different frequency bands without requiring separate filter parts for each band, thereby reducing device complexity while maintaining multiband capability.
Solution Approach 2:
The filter circuit is designed as a universal component that can handle multiple frequency bands through a single integrated structure. By using a configuration that includes multiple filter elements with specific connections, the circuit achieves multi-functionality, allowing it to filter signals across different frequency bands without requiring separate dedicated filter parts for each band.
2Adaptability or versatility
If multiple filter parts are used to handle multiple frequency bands, then multiband capability is achieved, but miniaturization is hindered
Solution Approach 1:
The patent merges multiple filter functions into a single integrated filter circuit, significantly reducing the volume required for filtering operations across multiple frequency bands. This consolidation eliminates the need for multiple separate filter parts, allowing the receiver to be miniaturized while maintaining the ability to handle multiple frequency bands simultaneously.
3Volume of moving object
If filter parts are eliminated and receiving circuit is integrated into a single chip, then miniaturization is achieved, but filtering precision may be compromised
Solution Approach 1:
The patent achieves filtering precision without multiple separate filter parts by integrating multiple filter elements into a single chip. The filter circuit includes multiple filter elements connected in a specific configuration that enables precise filtering operations for different frequency bands, maintaining high manufacturing precision while enabling miniaturization through single-chip integration.
4Device complexity
If a single chip is used for receiving circuit integration, then device complexity is reduced, but handling multiple frequency bands becomes more difficult
Solution Approach 1:
The patent implements a universal filter circuit design on a single chip that can handle multiple frequency bands. The filter circuit includes multiple filter elements with specific connections that enable the single chip to perform filtering operations across different frequency bands, achieving multiband capability without increasing device complexity or requiring multiple separate parts.
Data Source
AI summary
A radio communication apparatus using a direct conversion method capable of receiving a radio signal having a predetermined frequency band. The radio communication apparatus includes: a low-noise amplifier section including one or a plurality of low-noise amplifiers receiving input of a receiving signal having a predetermined frequency band; and a mixer section including in-phase and quadrature mixers demodulating an output of the low-noise amplifier into in-phase-component and quadrature-component signals, respectively, wherein the mixer section includes a capacitor in an input section, separates the in-phase component and the quadrature component by the capacitor, and supplies the components to the corresponding in-phase and quadrature mixers, respectively.