VCO Predistortion for Linear Control Voltage to Frequency Response
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Voltage-controlled oscillators (VCOs) in modern communication systems face limitations in linearity and linear range due to reduced feature sizes and metal wirings, leading to non-ideal performance in phase-locked loop circuits.
Innovation Solution
Incorporating a predistortion module to correct the non-linear characteristics of VCOs by measuring and storing a predistortion function, which is used to predistort the input voltage, ensuring a linear relationship between input voltage and oscillation frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feature sizes of devices and metal wirings are reduced to advance integrated circuit technique, then device integration and circuit density are improved, but linearity and linear range of the VCO deteriorate
Solution Approach 1:
The patent applies predistortion processing before the VCO to compensate for non-linear characteristics in advance. By measuring the VCO's non-linear characteristics and applying the opposite distortion to the input voltage, the system pre-corrects the signal so that the final output achieves linear relationship between control voltage and oscillation frequency, thus resolving the linearity deterioration caused by miniaturization.
2Area of stationary object
If feature sizes of devices and metal wirings are reduced, then circuit density is improved, but linear range of the VCO is reduced
Solution Approach 1:
The predistortion module pre-processes the control voltage to extend the effective linear range. By applying compensation based on measured non-linear characteristics, the system expands the voltage range over which the VCO operates linearly, effectively counteracting the linear range reduction caused by smaller feature sizes and wiring dimensions.
Data Source
AI summary
The present application discloses a voltage-controlled oscillator device and a method of correcting the voltage-controlled oscillator. The voltage-controlled oscillator device comprises predistortion module, configured to predistort an input voltage to obtain a predistorted voltage; and a voltage-controlled oscillator, configured to generate an output signal with a corresponding oscillation frequency according to the predistorted voltage, wherein the predistortion module corrects a non-linear characteristic of the voltage-controlled oscillator, so that there is a linear relationship between the input voltage and the oscillation frequency of the output signal. The voltage-controlled oscillator device may be applied to a phase-locked circuit in a communication system.