Frequency Synthesizer Gain Calibration for Multi-Band Modulation
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Solution Overview
Problem
Conventional two-point modulators in mobile radio systems face challenges in accurately determining and calibrating frequency gain mismatches, especially when transmitting multi-band output signals, leading to deteriorated frequency response.
Innovation Solution
A frequency synthesizing module with an operating circuit, controllable oscillating circuit, and control circuit that generates control signals to adjust the oscillating frequency and feedback signals, allowing for precise estimation of frequency gain by maintaining the control voltage at a reference level, thereby eliminating gain mismatch effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the frequency gain of the controllable oscillator is determined using conventional methods, then the determination can be performed, but the accuracy is insufficient and the time required is too long
Solution Approach 1:
The patent applies preliminary action by pre-establishing the proportional relationship between the first and second control signals before performing the frequency gain determination. The control circuit is designed to maintain a fixed proportion between the two control signals, which allows for faster and more accurate determination of the frequency gain without requiring complex real-time calculations.
2Adaptability or versatility
If the voltage-controlled oscillator operates across multiple frequency bands, then the versatility is improved, but the gain mismatch increases and frequency response deteriorates
Solution Approach 1:
The patent employs feedback by using the determined frequency gain to adjust and compensate for gain mismatches in the voltage-controlled oscillator across different frequency bands. The system continuously monitors and corrects the gain variations, ensuring that the frequency response remains accurate and reliable even when operating across multiple frequency bands.
Data Source
AI summary
A frequency synthesizing module includes an operating circuit, for generating a control voltage according to a reference signal and a feedback signal; a controllable oscillating circuit, configured for generating an oscillating signal according to the control voltage and a first control signal, comprising a first oscillating circuit with a first frequency gain, and a second oscillating circuit with a second frequency gain; a feedback circuit, for generating the feedback signal according to the oscillating signal and a second control signal; a control circuit, for generating the first control signal and the second control signal; wherein the control circuit adjusts the first control signal by a first value and adjusts the second control signal by a second value to estimate the first frequency gain of the first oscillating circuit; wherein the first value is proportional to the second value.