Programmable Voltage Driver Slices for Impedance-Matched Waveforms
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Solution Overview
Problem
Existing voltage drivers in automated test equipment (ATE) face challenges in generating precise voltage levels and impedance matching for high-speed semiconductor testing, leading to unreliable and inefficient waveform testing.
Innovation Solution
A voltage driver circuit with programmable circuit slices, allowing adjustable output impedance and time domain behavior, is implemented, enabling precise control over voltage levels and impedance matching through a combination of switches and capacitors, ensuring reliable and efficient waveform generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a voltage driver uses fixed supply voltages and binary-based voltage level control, then the device complexity is reduced, but the manufacturing precision and adaptability of voltage levels are insufficient for high-speed semiconductor testing
Solution Approach 1:
The voltage driver circuit is divided into multiple circuit slices, each capable of contributing a specific voltage level. By selectively activating different slices through control signals, the driver can generate precise voltage levels without requiring complex binary-weighted resistor networks. This segmentation enables fine-grained voltage control while maintaining circuit simplicity.
Solution Approach 2:
The voltage driver implements dynamic voltage level selection by using control signals to selectively activate different circuit slices based on the desired output voltage. This dynamic switching capability allows the driver to adapt to different voltage requirements in real-time, improving manufacturing precision without permanently increasing circuit complexity.
2Adaptability or versatility
If a voltage driver provides programmable output voltage levels, then the adaptability is improved, but the output impedance control and time domain behavior precision are insufficient
Solution Approach 1:
The circuit is divided into slices that can be independently controlled, allowing separate optimization of voltage level output and impedance characteristics. Each slice can be configured to provide specific impedance values, enabling precise impedance matching to different load conditions while maintaining voltage programmability.
Solution Approach 2:
The voltage driver allows dynamic changing of multiple parameters including voltage level, output impedance, and time domain characteristics by selectively activating different circuit slices. This parameter adjustability enables the driver to adapt to various testing conditions while maintaining high precision through controlled slice activation.
3Manufacturing precision
If a voltage driver uses multiple circuit slices with different time constants, then the time domain behavior control is improved, but the device complexity increases
Solution Approach 1:
The voltage driver is segmented into multiple circuit slices, each with its own time constant characteristics. By selectively activating specific slices based on the desired time domain behavior, the system can precisely control waveform characteristics without requiring all slices to be simultaneously active, thereby managing complexity through controlled segmentation.
4Reliability
If a voltage driver is designed for high-speed applications with adjustable output impedance, then the reliability of waveform testing is improved, but the power consumption increases
Solution Approach 1:
The voltage driver dynamically adjusts output impedance and activates only the necessary circuit slices required for the current testing requirement. This dynamic operation allows the driver to maintain high reliability for waveform testing by optimizing impedance matching in real-time, while minimizing power consumption by keeping unused slices in a low-power state.
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 enables the generation of waveforms that more reliably and quickly test semiconductor devices by providing precise control over voltage levels and impedance matching, reducing power consumption and improving test accuracy.
Implementation Method 1
Each circuit slice comprises a time constant, and one or more switches configured to switchably connect the driver output to a first voltage level or a second voltage level... a capacitor having a programmable capacitance connected to the second resistor terminal
Data Source
AI summary
Disclosed herein are voltage driver circuits and methods of operating the same. In some embodiments, a plurality of circuit slices are provided in a voltage driver circuit, each circuit slice has a time constant, and is controlled to switchably connect a driver output to either a high voltage level or a low voltage level, or to disconnect the driver output from both voltage levels. The circuit slices may provide an adjustable output impedance, which may be set to match the impedance of different loads. The circuit slices may also provide adjustable voltages with low power consumption, particularly in high speed applications. The circuit slices may also have programmable capacitors that may be adjusted to provide a programmable time domain behavior of the output voltage waveform, such as a programmable voltage peaking characteristic.