Switchable VCO Transconductors for Low-Power Phase Noise Control
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Solution Overview
Problem
Current techniques for voltage controlled oscillators (VCOs) face challenges in achieving low power operation while maintaining sufficient tuning range and desired phase noise performance across all process and temperature corners, leading to inefficiencies and increased power consumption.
Innovation Solution
The implementation of a VCO with a tank formed by a capacitor and inductor, coupled with switchable transconductors that can be dynamically controlled based on operating parameters, such as a detection circuit and voltage regulator, to adjust energy supply and minimize power consumption by selectively coupling or decoupling transconductor slices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transconductors are continuously coupled to the VCO tank to maintain oscillation, then phase noise performance is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic control of transconductor coupling to the VCO tank based on detected oscillation conditions. The system transitions from static continuous coupling to dynamic on-demand coupling, adjusting transconductor activation based on real-time oscillation amplitude and frequency detection to maintain phase noise performance while reducing unnecessary power consumption.
Solution Approach 2:
The patent employs a feedback mechanism where detection circuits monitor oscillation parameters (amplitude, frequency) and use this information to control transconductor switching. The detected oscillation conditions feed back to the control logic that determines transconductor activation, creating a closed-loop system that optimizes the balance between phase noise performance and power consumption.
2Adaptability or versatility
If multiple transconductors are used to cover entire radio band tuning range, then tuning range is improved, but device complexity increases
Solution Approach 1:
The patent divides the transconductor function into multiple independent transconductor units that can be selectively activated. Each transconductor can be controlled independently based on the required tuning range and operating conditions, allowing the system to achieve broad tuning coverage while reducing complexity by activating only the necessary segments at any given time.
Solution Approach 2:
The patent implements dynamic selection and activation of individual transconductors based on real-time operating conditions and tuning requirements. The system transitions from a static configuration where all transconductors must be present and potentially active to a dynamic configuration where transconductors are selectively activated based on current needs, reducing effective complexity.
3Use of energy by moving object
If transconductors are optimized for low power operation, then power consumption is reduced, but phase noise performance deteriorates
Solution Approach 1:
The patent employs periodic activation of transconductors based on detected oscillation conditions rather than continuous operation. By using periodic on-demand activation triggered by oscillation detection, the system achieves low average power consumption while maintaining phase noise performance during active oscillation periods through precise timing and duration of transconductor activation.
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
This approach enables efficient low-power operation of VCOs across various corners, reducing power consumption and maintaining desired phase noise performance by dynamically adjusting transconductance in response to changing operating conditions.
Implementation Method 1
a tank formed of at least one capacitor coupled in parallel with at least one inductor
Implementation Method 2
a plurality of transconductors to provide energy to the tank
Data Source
AI summary
In one embodiment, an apparatus includes a voltage controlled oscillator (VCO) to output an oscillating signal. The VCO may have a tank formed of at least one capacitor coupled in parallel with at least one inductor, and a plurality of transconductors to provide energy to the tank. At least one of the plurality of transconductors can be controllably switched to be coupled to the tank or to be decoupled from the tank.