Programmable VCO Architecture for Wide Tuning and Low Phase Noise
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Solution Overview
Problem
Conventional voltage controlled oscillators with wide tuning ranges suffer from high phase noise and challenges in compact, cost-effective packaging due to difficulties in fabricating inductors and capacitors in monolithic semiconductor devices.
Innovation Solution
A digitally programmable VCO circuit with a variable capacitance circuit and inductive elements formed in a laminate package, allowing operation over multiple frequency bands with programmable capacitance and inductive elements, enabling low phase noise and compact packaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional voltage controlled oscillators use wide tuning range design, then frequency coverage is improved, but phase noise increases
Solution Approach 1:
The VCO is divided into multiple oscillator core circuits, each optimized for a specific frequency band. A variable capacitance circuit with programmable elements selects and configures the appropriate oscillator core for the desired frequency range, allowing wide overall tuning coverage while maintaining low phase noise within each segment.
Solution Approach 2:
The system dynamically reconfigures the oscillator core circuit and variable capacitance circuit based on the desired operating frequency. Control logic programmatically adjusts the capacitance values and selects appropriate oscillator cores to optimize performance for the current frequency band, enabling adaptation across wide tuning ranges without compromising phase noise.
2Device complexity
If voltage controlled oscillators use monolithic semiconductor fabrication, then integration is improved, but inductor and capacitor fabrication becomes difficult
Solution Approach 1:
The patent combines monolithic semiconductor fabrication for the oscillator core circuits and variable capacitance elements with laminate package technology for the inductive elements. This hybrid approach maintains high integration benefits while overcoming the limitations of fabricating precise inductors and capacitors in standard semiconductor processes.
Solution Approach 2:
The laminate package serves as an intermediary substrate that provides precisely controlled inductive elements and capacitive structures. These passive components are fabricated on the laminate with high precision, then interconnected with the monolithic semiconductor oscillator circuits through controlled impedance traces and bonding techniques.
3Reliability
If voltage controlled oscillators use traditional packaging, then component functionality is maintained, but package size and cost increase
Solution Approach 1:
The laminate package merges multiple functions into a single integrated structure: it serves as the substrate for inductive elements, provides capacitive structures, offers controlled impedance transmission lines, and acts as the mechanical package housing. This consolidation dramatically reduces overall package size while maintaining all necessary component functionalities.
Solution Approach 2:
The laminate package is designed as a multi-functional platform that simultaneously provides electrical interconnections, mechanical support, thermal management, and electromagnetic shielding. The same laminate structure that carries the inductive elements also serves as the package substrate and housing, eliminating the need for separate components and reducing overall size.
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 solution achieves a wide tuning range with low phase noise and compact, cost-effective packaging by utilizing programmable capacitance and inductive elements in a laminate package, addressing the limitations of conventional VCOs.
Implementation Method 1
The variable capacitor may be implemented as a varactor diode which tunes the resonator in response to a tuning voltage
Data Source
AI summary
A voltage controlled oscillator includes a variable capacitance circuit having a plurality of variable capacitance elements, each having a capacitance that is a function of a tuning voltage, two or more oscillator core circuits, each operable over a specified frequency band, and inductive elements connected between the variable capacitance circuit and the oscillator core circuits.