PLL Synthesizer Module for Worldwide 1-Hz Frequency Setting
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Solution Overview
Problem
Conventional frequency synthesizer modules for digital terrestrial broadcasting face challenges in easily setting oscillation frequencies across different destination areas with common worldwide specifications, particularly in accommodating 1-Hz step frequency settings.
Innovation Solution
A frequency synthesizer module incorporating a reference clock oscillation circuit, voltage controlled oscillator, control section, switch, and central processing unit, which uses a memory to store frequency modes and calculation formulas, allowing the CPU to calculate and set frequencies based on channel numbers, ensuring accurate frequency output regardless of the destination area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional frequency synthesizer module separates every channel range into several bands and selects a channel number in a band with a digital switch, then it can cope with the setting for a limited destination area where channel frequencies are arranged at fixed frequency intervals, but it cannot achieve frequency setting in 1-Hz step for common worldwide use
Solution Approach 1:
The patent changes the fundamental parameter of frequency setting from fixed band selection to continuous 1-Hz step adjustment. The synthesizer module enables frequency setting in 1-Hz steps across the entire frequency range, eliminating the need for separate band selection mechanisms and enabling universal compatibility with different destination area specifications.
2Adaptability or versatility
If a synthesizer module is designed with common worldwide specifications for 1-Hz step frequency setting, then it can be used in all destination areas, but it increases the complexity of integrating multiple setting approaches
Solution Approach 1:
The patent implements a universal frequency synthesizer module that can operate in all destination areas with common specifications. The module integrates multiple setting approaches (band selection and 1-Hz step adjustment) into a single unified system, eliminating the need for separate configurations for different regions and simplifying the overall device architecture.
3Measurement precision
If both band selection and 1-Hz step frequency setting approaches are integrated, then frequency setting capability is improved, but the ease of operation for frequency setting persons deteriorates due to complexity
Solution Approach 1:
The patent extracts the complexity of multiple setting approaches and separates the frequency setting into a simple, unified interface. Users can set frequencies directly in 1-Hz steps without needing to understand or navigate through band selection mechanisms, maintaining high precision while ensuring ease of operation.
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 easy and accurate frequency setting with common specifications across all areas, reducing equipment costs and simplifying operations, while also allowing for standard frequency setting even with incorrect channel number inputs.
Implementation Method 1
a voltage controlled oscillator, an amplifier which amplifies an output from the voltage controlled oscillator
Implementation Method 2
compare a phase of the generated signal of the set frequency with a phase of a signal input from the voltage controlled oscillator, and output a phase difference signal as a voltage value
Implementation Method 3
an amplifier which amplifies an output from the voltage controlled oscillator
Data Source
AI summary
To provide a synthesizer module that can be used not only in a destination area but also in the whole world and that can be readily set in output frequency. In the synthesizer module, a calculation formula table of a nonvolatile memory stores a plurality of frequency modes and the calculation formula of carrier frequencies corresponding to those frequency modes, and further stores, in its certain area, a frequency mode set during an initial setting of the device. A CPU, when receiving a channel number from a rotary SW during a frequency setting, calculates, based on a calculation formula corresponding to a currently set frequency mode, a carrier frequency corresponding to the channel number. This carrier frequency is set to a CONT of a PLL part.