DAC Adjustment Potential Stabilization With External Capacitor
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Solution Overview
Problem
Conventional digital-analogue converters suffer from interference, particularly noise, in the adjustment potential line, which affects the stability of current components and degrades the quality of the output signal.
Innovation Solution
An external capacitor is connected to the adjustment potential line to stabilize the adjustment potential, reducing interference and improving the quality of the output signal, and a resistor is added in the adjustment potential line to further suppress interference, while a shared adjustment circuit and potential line are used across multiple digital-analogue converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an external capacitor is connected to the adjustment potential line, then the stability of the adjustment potential is improved, but the device complexity increases
Solution Approach 1:
An external capacitor is introduced as an intermediary element connected to the adjustment potential line. This capacitor acts as a mediator that stabilizes the adjustment potential by filtering out noise and interference, thereby improving the stability of the potential without requiring fundamental changes to the converter architecture.
Solution Approach 2:
The stabilization function is separated from the main converter circuitry by using an external capacitor. This segmentation allows the capacitor to be added independently to address stability issues without redesigning the entire device, thus managing complexity through functional separation.
2Reliability
If noise in the reference current is reduced, then the quality of current components is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The external capacitor serves as a mediator between the noisy reference current and the current components. By filtering the adjustment potential, the capacitor indirectly reduces the impact of reference current noise on the current components, improving their quality without requiring tighter manufacturing tolerances on the transistors themselves.
Solution Approach 2:
Instead of trying to eliminate noise at its source (which would require high manufacturing precision), the invention converts the harmful noise into a manageable issue by using the capacitor to filter its effects. The noise is not eliminated but its impact is transformed into a controllable parameter through external filtering.
3Device complexity
If a shared adjustment circuit is used across multiple digital-analogue converters, then the device complexity is reduced, but the interference affecting all converters increases
Solution Approach 1:
The external capacitor acts as a mediator on the shared adjustment potential line, filtering out interference before it can affect multiple converters. This allows the benefits of sharing (reduced complexity) to be maintained while the capacitor mitigates the harmful interference that would otherwise propagate across all connected converters.
Solution Approach 2:
The capacitor provides beforehand cushioning by pre-filtering the adjustment potential on the shared line. This protective measure is in place before interference can affect the converters, cushioning them against noise and ensuring stable operation across all devices sharing the adjustment circuit.
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 configuration significantly reduces noise and improves the signal quality, enabling more accurate analogue-digital conversion and enabling the use of digital-analogue converters in feedback arrangements like delta-sigma converters, enhancing signal bandwidth and reducing power consumption.
Implementation Method 1
An external capacitor is connected to the adjustment potential line to stabilize the adjustment potential
Data Source
AI summary
The invention relates to an integrated circuit arrangement (10) comprising at least one digital-analogue converter (12) with a multitude of current-source transistors (N1-N8) arranged parallel to each other for providing current components (I1-I8) that in each case are predetermined in a fixed manner and are used to form an analogue current signal, wherein control inputs of the current-source transistors (N1-N8) can be subjected to a shared adjustment potential by way of an adjustment potential line (14), which adjustment potential defines the individual current components (I1-I8), and comprising an adjustment circuit (16) for providing the adjustment potential at the adjustment potential line (14). In order to drastically reduce interference, in particular noise, in the individual current components (I1-I8), the integrated circuit arrangement (10) comprises an external connection (18), which is connected to the adjustment potential line (14) for connecting an external capacitor (C0).