Per-Cell DAC Calibration Circuit for Timing and Amplitude Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing digital-to-analog converters (DACs) face challenges in accurately converting digital signals to analog signals due to timing and amplitude errors across different DAC cells, which can lead to inaccuracies in generating analog signals.
Innovation Solution
The proposed solution involves a device with a digital-to-analog conversion system that includes a bias control circuit, a driver circuit with adjustable transconductance, and a current steering circuit. This system allows for individual calibration of each DAC cell to adjust drive strength and current amplitude, thereby reducing timing and amplitude errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual calibration of each DAC cell is implemented to adjust drive strength and current amplitude, then timing and amplitude errors are reduced and conversion accuracy is improved, but device complexity and calibration process time increase
Solution Approach 1:
The patent applies parameter changes by adjusting drive strength and current amplitude through calibration of each DAC cell. The bias control circuit modifies electrical parameters (drive strength, current amplitude) to compensate for manufacturing variations and timing errors, thereby improving conversion accuracy without requiring complete redesign of the DAC architecture.
Solution Approach 2:
The patent segments the DAC into individual calibratable cells, where each cell can be independently adjusted. This segmentation allows precise control over timing and amplitude for each cell, enabling error correction at the cell level while maintaining overall system functionality through modular calibration.
2Manufacturing precision
If calibration circuits and control signals are added to each DAC cell, then timing and amplitude control precision is improved, but manufacturing complexity and production cost increase
Solution Approach 1:
The bias control circuit serves multiple functions: it provides drive strength control, current amplitude adjustment, and timing synchronization for multiple DAC cells simultaneously. This multi-functionality reduces the need for separate calibration circuits for each cell, simplifying manufacturing while maintaining precision control.
Solution Approach 2:
The calibration is performed during the manufacturing process or initialization phase, establishing precise timing and amplitude parameters before the DAC enters normal operation. This preliminary calibration action ensures high manufacturing precision is achieved without requiring complex real-time adjustment mechanisms during operation.
3Measurement precision
If multiple transistors and control voltages are used per DAC cell for calibration, then conversion accuracy and error reduction are improved, but power consumption and circuit area increase
Solution Approach 1:
The patent implements dynamic control of drive strength and current amplitude through adjustable transistors and control voltages. During calibration, full power is used to achieve precise measurement and adjustment. During normal operation, the system dynamically adjusts to maintain accuracy while optimizing power consumption based on operational requirements rather than maintaining maximum calibration power continuously.
Data Source
AI summary
Described herein are related to a device including a digital-to-analog converter (DAC) configured to convert a digital signal into an analog signal. In one aspect, the device includes a first circuit configured to generate a first signal. In one aspect, the device includes a second circuit coupled to the first circuit. The second circuit may be configured to generate a second signal, based on the first signal. The second signal may have a first edge according to the first signal. In one aspect, the device includes a third circuit coupled to the second circuit. The third circuit may be configured to generate a third signal having a second edge, in response to the first edge of the second signal. In one aspect, an amplitude of the third signal may correspond to one bit.