Radio Receiver Tuning via Switched Positive Feedback
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Solution Overview
Problem
Existing radio wave receiving apparatuses face challenges in automatically adjusting tuning circuits without a precise oscillation circuit, as they require either a transmission radio wave for tuning or a separate oscillation circuit, which complicates integration and increases component count.
Innovation Solution
A radio wave receiving apparatus with a simple circuit configuration that includes an antenna, a tuning member with variable frequency characteristics, a receiving member for demodulating signals, a positive feedback member, and a switching member to control feedback operations, allowing for automatic tuning without an accurate oscillation circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate oscillation circuit is added to perform tuning processing, then the tuning accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent merges the oscillation circuit functionality into the existing receiving circuit by utilizing the amplifier and feedback path. The receiving circuit's amplifier is made to operate in oscillation mode by configuring the feedback coefficient to be positive and greater than unity, eliminating the need for a separate oscillation circuit while maintaining tuning accuracy.
Solution Approach 2:
The receiving circuit's amplifier is designed to serve dual purposes: normal signal reception and oscillation generation for tuning. By controlling the feedback coefficient, the same circuit component performs both functions, reducing overall device complexity while preserving tuning precision.
2Measurement precision
If an accurate oscillation circuit is provided, then the tuning processing accuracy is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The oscillation circuit is merged with the receiving circuit by utilizing existing components (amplifier, feedback path) rather than adding separate components. This integration approach simplifies manufacturing as it reduces the number of discrete components that need to be mounted and connected.
Solution Approach 2:
The receiving circuit's amplifier serves itself by generating the oscillation signal needed for tuning through its own feedback mechanism. This self-service capability eliminates the need for external oscillation circuits, making the device easier to manufacture and integrate.
3Reliability
If a separate oscillation circuit is added, then the reliability of tuning processing is improved, but the device complexity increases
Solution Approach 1:
The oscillation functionality is merged into the receiving circuit's amplifier, which is already a reliable component. By reusing the existing amplifier and feedback path rather than adding separate components, the patent maintains tuning reliability while avoiding the reliability issues that could arise from additional separate oscillation circuits.
4Adaptability or versatility
If the feedback coefficient is made variable, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The feedback coefficient is made variable to allow the circuit to adapt to different operating conditions and frequency ranges. This dynamic adjustment capability enables the same circuit to perform reliable oscillation across multiple frequencies without requiring separate fixed circuits for each frequency, thereby improving adaptability while managing complexity through a single adjustable parameter.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient tuning of the antenna frequency by using positive feedback and switching mechanisms, reducing the need for additional oscillation circuits and simplifying integration, while maintaining effective signal reception and processing.
Implementation Method 1
a positive feedback member to perform a positive feedback in a signal path including the tuning member
Data Source
AI summary
A radio wave receiving apparatus includes: an antenna to receive a radio wave; a tuning member to allow a reception frequency of the antenna to be tuned to an intended frequency, in which tuning member a frequency characteristic is variable; a receiving member to receive a reception signal from the antenna to demodulate a modulation wave; a positive feedback member to perform a positive feedback in a signal path including the tuning member; and a switching member to turn on/off a feedback operation of the positive feedback member.