Dual-Control Transceiver Frequency Switching for Faster PLL Locking
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Solution Overview
Problem
The loop bandwidth of a phase-locked loop in Bluetooth systems limits the locking speed and frequency switching speed, restricting the ability to quickly switch frequencies within a wide transmission band range.
Innovation Solution
A transceiver device and method that utilize a conversion circuit, phase-locked loop, and voltage-controlled oscillator to generate control signals for adjusting oscillation frequency, enabling rapid frequency switching and mode changes by adjusting the oscillation frequency of the voltage-controlled oscillator based on modulation data and reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the loop bandwidth of the phase-locked loop is increased to improve locking speed, then the frequency switching speed improves, but the stability of the phase-locked loop deteriorates
Solution Approach 1:
The patent divides the frequency control into two independent segments: a first voltage-controlled oscillator for frequency hopping and a second voltage-controlled oscillator for phase-locked loop operation. This segmentation allows each oscillator to operate with optimized parameters - the first can switch frequencies rapidly while the second maintains stable phase locking, thus resolving the contradiction between locking speed and stability.
2Stability of the object's composition
If the loop bandwidth is restricted to maintain stability, then the phase-locked loop remains stable, but the frequency switching speed deteriorates
Solution Approach 1:
By separating the frequency synthesis function into two independent voltage-controlled oscillators, the patent enables the first VCO to operate with wide frequency switching capability while the second VCO operates with stable phase-locked loop parameters. The frequency hopping signal from the first VCO is then mixed with the stable signal from the second VCO, achieving both fast switching and stability.
3Device complexity
If a single voltage-controlled oscillator is used for both frequency hopping and phase-locked loop, then the device complexity is reduced, but the frequency switching speed deteriorates
Solution Approach 1:
The patent segments the oscillator function into two specialized units: one dedicated to frequency hopping with fast switching capability and another dedicated to phase-locked loop with stability. This functional segmentation, combined with signal mixing, achieves superior performance compared to a single oscillator, justifying the increased complexity.
Solution Approach 2:
The patent merges the output signals from two separate voltage-controlled oscillators through mixing to produce the final frequency-hopped signal. This combining approach allows the system to leverage the fast switching of the first VCO and the stability of the second VCO, achieving performance unattainable with a single oscillator.
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
The transceiver device achieves quick frequency and mode switching within a wide transmission band, enhancing the locking speed of the phase-locked loop and enabling efficient operation in various modes.
Implementation Method 1
The voltage-controlled oscillator is configured to determine an oscillation frequency according to the first control signal and the second control signal to generate the frequency signal with the oscillation frequency
Implementation Method 2
The phase-locked loop is configured to generate a frequency signal according to the modulation data, the first control signal, and a reference signal
Data Source
AI summary
A transceiver device includes a conversion circuit, a phase-locked loop, a transmission processing circuit, a reception processing circuit, and a selection circuit. The conversion circuit performs a digital-to-analog conversion for a modulation data to generate a first control signal. The phase-locked loop includes a control circuit and a voltage-controlled oscillator. The control circuit generates a second control signal according to the modulation data, a reference signal, and a frequency signal. The voltage-controlled oscillator determines an oscillation frequency according to the first control signal and the second control signal to generate the frequency signal. The transmission processing circuit performs a transmission processing according to the frequency signal. The reception processing circuit performs a reception processing according to the frequency signal. The selection circuit selectively transmits the frequency signal to the transmission processing circuit or the reception processing circuit according to the modulation data.