Phase Mixer Duty Cycle Compensation for Linear Output
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Solution Overview
Problem
Phase mixers face challenges in maintaining step size linearity while adjusting duty cycle, leading to increased circuit complexity and power consumption, as well as mismatches in output non-linearity due to varying impacts of input signals.
Innovation Solution
A duty cycle adjuster circuit is introduced to complement the duty cycle variation of the phase mixer's output signal, using a matched step duty cycle response to stabilize the duty cycle of the combined output signal, thereby reducing overall duty cycle variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If driver sizes and step sequences are adjusted to correct step duty cycle non-linearity, then duty cycle linearity is improved, but circuit complexity and size increase substantially
Solution Approach 1:
The phase mixer circuit is divided into multiple independent phase mixing stages, each handling a portion of the phase adjustment range. This segmentation allows duty cycle correction to be applied locally at each stage rather than requiring complex global adjustment mechanisms, thereby improving duty cycle linearity while controlling circuit complexity
Solution Approach 2:
An intermediary duty cycle correction circuit is introduced between the phase mixer stages to compensate for duty cycle non-linearity. This intermediary component handles the correction function separately from the main phase mixing operation, allowing duty cycle linearity improvement without substantially increasing the complexity of the core phase mixer circuit
2Manufacturing precision
If driver sizes and step sequences are adjusted to correct step duty cycle non-linearity, then duty cycle linearity is improved, but power consumption increases
Solution Approach 1:
The circuit employs dynamically adjustable driver sizes and step sequences that adapt to the current operating phase range. By using dynamic adjustment rather than fixed oversized drivers, the circuit achieves duty cycle linearity across the full phase range while consuming less power, as drivers are optimized for their specific operating conditions rather than being over-provisioned for all conditions
Solution Approach 2:
The invention changes key circuit parameters (driver sizes, step sequences) based on the operating phase range. By adjusting these parameters dynamically or through switching between pre-optimized configurations, the circuit maintains duty cycle linearity while minimizing power consumption at each operating point, avoiding the need to run all drivers at maximum capability simultaneously
3Manufacturing precision
If phase mixer design is tailored for each specific application to correct duty cycle non-linearity, then duty cycle accuracy is improved, but adaptability decreases
Solution Approach 1:
The phase mixer is designed with universal building blocks and modular stages that can be configured for different phase ranges and duty cycle requirements. The core architecture remains consistent across applications, with adjustable parameters (number of stages, driver ratios, step sequences) that can be tuned to meet specific duty cycle accuracy requirements without requiring complete redesign, thereby maintaining both accuracy and adaptability
Data Source
AI summary
Apparatuses and methods for duty cycle adjustment are disclosed herein. An example apparatus may include a node, a phase mixer, and a duty cycle adjuster circuit. The phase mixer may have a first step duty cycle response and may be configured to provide a first output signal to the node in accordance with the first step duty cycle response. The duty cycle adjuster circuit may have a second step duty cycle response complementary to the first step duty cycle response and may be configured to provide a second signal to the node in accordance with the second step duty cycle response.