Symmetric Multiband Frequency Synthesis Without Multiple Local Oscillators
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Solution Overview
Problem
Existing wireless transmitting and receiving devices require multiple local oscillators to generate frequency-stable periodic signals for multiple transmission frequency bands, leading to increased complexity, energy consumption, and long permutation times between emission and reception frequency bands.
Innovation Solution
A device and method that utilize symmetry properties to generate frequency-stable periodic signals using a reduced number of local oscillators, employing multitone signals to produce frequency-stable periodic signals for transpositions between RF, intermediate, and baseband frequencies, thereby eliminating the need for multiple local oscillators and PLL structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple local oscillators are used to generate frequency-stable periodic signals for multiple transmission frequency bands, then frequency stability and signal quality are improved, but device complexity and energy consumption increase
Solution Approach 1:
The patent combines multiple local oscillators into a single local oscillator that generates a fundamental frequency signal. This single oscillator replaces multiple separate oscillators, reducing device complexity while maintaining frequency stability through symmetric frequency band processing.
Solution Approach 2:
The single local oscillator serves multiple functions by generating a fundamental frequency that is then processed through symmetric frequency band circuits to produce multiple frequency-stable periodic signals for different transmission bands, making one oscillator universal for multiple purposes.
2Adaptability or versatility
If multiple separate signal generators are used to enable emission and reception in two different transmission frequency bands, then adaptability is improved, but energy consumption and device complexity increase
Solution Approach 1:
The patent merges two separate signal generators into a single signal generator with symmetric frequency band processing capability. This single generator can produce signals for both transmission frequency bands by utilizing symmetric frequency relationships, reducing energy consumption while maintaining adaptability.
Solution Approach 2:
The patent exploits the symmetric properties of frequency bands around a center frequency. By designing circuits that process frequencies symmetrically (FCA-F1 and FCA+F1), the system achieves adaptability for multiple bands while using a single generator, as the symmetric structure allows one generator to serve multiple frequency purposes.
3Reliability
If PLL locking is used for frequency synthesis, then frequency stability is improved, but permutation time between emission and reception frequency bands increases
Solution Approach 1:
The patent pre-establishes symmetric frequency relationships and prepares the frequency synthesis structure in advance. By using a single local oscillator with pre-configured symmetric band processing circuits, the system can rapidly switch between frequency bands without requiring time-consuming PLL re-locking, as the frequency relationships are predetermined through the symmetric architecture.
4Reliability
If multiple local oscillators are used to generate frequency-stable periodic signals, then signal quality for multiple channels is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent merges multiple local oscillators into a single oscillator unit, reducing the number of components that need to be manufactured and assembled. This single oscillator with symmetric frequency processing circuits is easier and less costly to manufacture while maintaining signal quality through the symmetric frequency band design.
Data Source
AI summary
Device for emitting-receiving signals in two symmetrical frequency bands in relation to a first frequency FCA and such that each one of the bands comprises symmetrical channels in relation to second frequencies FCLA, FCUA, comprising:a first circuitry generating a signal of frequency FA, a signal of frequency FB=FA/N1, a signal of frequency F1=|FCA−FCLA| and a periodic signal of frequency F2 equal to the difference between a central frequency of one of the channels and the associated second frequency, and wherein FA=N1·(FCLA+F1)/(N1+1);a second circuitry able to carry out non-linear operations between the signals of frequencies FA and F1 and those of frequencies FB and F2, generating multitone signals comprising the frequencies FA−F1, FA+F1, FB−F2 and FB+F2.