Folded Cascode Clock Amplifier for Write Clock Signal Integrity
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Solution Overview
Problem
The write clock signal in semiconductor memory devices, such as DRAM, declines during transmission and requires amplification within the device, leading to potential errors in data transfer operations.
Innovation Solution
A clock amplifier circuit with a folded cascode amplifier that includes a gain adjustment unit to amplify the write clock signal, adjusting gain based on the input signal, and a memory device incorporating this circuit to ensure accurate data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the write clock signal is transmitted from the memory controller to the input/output circuit, then data transfer operations can be performed, but the signal declines during transmission causing potential errors
Solution Approach 1:
The patent introduces a clock amplifier circuit as an intermediary component between the memory controller and the input/output circuit. This amplifier receives the declining write clock signal, amplifies it to restore its strength, and provides the amplified signal to the input/output circuit, thereby preventing signal decline from causing data transfer errors
Solution Approach 2:
The clock amplifier circuit performs preliminary amplification of the write clock signal before it reaches the input/output circuit. By proactively boosting the signal strength in advance, the system prevents the signal from declining to error-causing levels during subsequent data transfer operations
2Reliability
If a clock amplifier circuit is introduced to amplify the write clock signal, then signal integrity is maintained, but device complexity increases
Solution Approach 1:
The patent merges the clock amplifier circuit with the existing memory device structure, integrating it into the signal path between the memory controller and input/output circuit. This consolidation approach maintains signal integrity while avoiding the need for separate, standalone amplifier systems, thereby limiting the increase in overall device complexity
Data Source
AI summary
A memory device including a memory cell array, an input/output circuit receiving data to be stored in the memory cell array based on a write clock signal received from an external device during a write operation, and a clock amplifier circuit providing an internal clock signal to the input/output circuit by amplify the write clock signal and including a folded cascode amplifier which amplifies the write clock signal. The folded cascode amplifier amplifies the write clock signal according to a gain between an input unit and an output unit, and includes a gain adjustment unit which is connected to the output unit and increases the gain between the input unit and the output unit based on the write clock signal.