Latch Receiver Circuit With Separate Current Source for Fast Data Sensing
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Solution Overview
Problem
Memory devices face challenges in maintaining operation speed due to input receivers' inability to accurately interpret input data, leading to potential crashes or abnormal operations as the speed requirements increase.
Innovation Solution
A data receiving circuit design incorporating a data input circuit, a latch circuit, and a current source, along with transistors and an equalizer, which provides a current to the latch circuit to enhance signal interpretation and output accuracy, particularly by managing parasitic elements through current management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If input receivers are used to receive input signals in memory devices, then data reception function is provided, but as operation speed requirements increase, the input receivers cannot keep up, resulting in small margin to correctly determine input data and potential crashes or abnormal operations
Solution Approach 1:
The input receiver is divided into separate functional blocks: data input circuit, latch circuit, and current source. This segmentation allows each component to be optimized independently for speed and accuracy, with the latch circuit specifically designed to hold and stabilize data at critical moments, preventing crashes while maintaining high operation speed.
Solution Approach 2:
The latch circuit is configured to latch the output of the data input circuit before the data is fully processed. This preliminary action ensures that the data is captured and stabilized in advance, providing a reliable reference point that prevents interpretation errors even at high speeds, thereby improving both speed tolerance and data accuracy.
2Device complexity
If a single current source is used for both data input circuit and latch circuit, then device complexity is reduced, but the ability to independently optimize current for accurate data latching is compromised
Solution Approach 1:
The current source is segmented into two independent sources: one for the data input circuit and another for the latch circuit. This allows independent optimization of current parameters for each function, ensuring that the latch circuit receives precisely controlled current necessary for accurate data capture, while maintaining manageable device complexity through modular design.
Solution Approach 2:
Different current characteristics are provided to different parts of the circuit: the data input circuit receives current optimized for signal reception, while the latch circuit receives current optimized for stable data holding. This local quality differentiation ensures high data latching accuracy without unnecessarily complicating the overall device structure.
3Device complexity
If parasitic elements in the data receiving circuit are not managed, then device complexity is minimized, but signal integrity deteriorates, leading to incorrect data interpretation and abnormal operations
Solution Approach 1:
The harmful effects of parasitic elements are extracted and compensated for through the dedicated latch circuit and separate current source. The latch circuit isolates the data from parasitic interference during critical latching moments, while the independent current source provides stable biasing that counteracts parasitic effects, ensuring signal integrity without adding excessive circuit complexity.
Solution Approach 2:
The latch circuit acts as an intermediary between the data input circuit and subsequent processing stages. It buffers the data signal, isolating it from parasitic elements in both the input and output paths. This intermediary function maintains signal integrity while keeping the overall circuit structure relatively simple.
Data Source
AI summary
A data receiving circuit is provided. The data receiving circuit includes a data input circuit, a latch circuit, and a current source. The data input circuit is configured to receive an input signal. The latch circuit is configured to output an output signal in response to the input signal. The current source is configured to provide a current to the latch circuit. The current source is different from the data input circuit.