Differential Amplifier Precharge Control for Kickback Noise Compensation
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Solution Overview
Problem
Parasitic capacitors in semiconductor amplifiers generate kickback noise, reducing the sensing margin and hindering accurate amplification operations due to changes in voltage levels of input signals.
Innovation Solution
An amplification circuit with a precharge control circuit and an amplifier that differentially amplifies input signals and reference voltages, adjusting current driving force based on clock signal logic levels and reference voltage levels to compensate for kickback noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If semiconductor manufacturing process becomes fine, then device integration density is improved, but parasitic capacitors are formed between semiconductor devices generating kickback noise
Solution Approach 1:
The patent applies preliminary action by precharging the output nodes to a predetermined voltage level before the amplification operation. The precharge circuit sets the output nodes to a known state in advance, which prevents kickback noise from affecting the sensing margin during subsequent signal amplification. This preliminary preparation eliminates the harmful effect of parasitic capacitors before they can interfere with the main function.
2Measurement precision
If parasitic capacitors generate kickback noise, then sensing margin is reduced, but accurate sensing amplification operation cannot be performed
Solution Approach 1:
The precharge circuit performs preliminary action by establishing a predetermined voltage level at the output nodes before amplification. This preliminary setting ensures that when the amplification operation begins, the output nodes start from a known, stable voltage state, thereby maintaining the sensing margin and enabling accurate detection of differential signals despite the presence of parasitic capacitors.
Solution Approach 2:
The patent changes the voltage parameter of the output nodes by using a precharge circuit that sets them to a specific predetermined voltage level. This parameter change (voltage level adjustment) compensates for the effect of kickback noise from parasitic capacitors, maintaining the sensing margin and ensuring reliable amplification operation.
3Reliability
If precharge circuit precharges output nodes, then kickback noise is compensated, but additional circuit components are added
Solution Approach 1:
The precharge control circuit is designed to be universally applicable to different operating conditions and amplifier configurations. It uses a clock signal to control the precharge operation, making it adaptable to various timing requirements. This multi-functional design allows the same precharge mechanism to serve different purposes (resetting, precharging, and maintaining voltage levels) without requiring separate dedicated circuits for each function.
Data Source
AI summary
An amplification circuit is configured to differentially amplify an input signal and a reference voltage to generate an output signal when a clock signal has a first logic level. The amplification circuit is configured to precharge the output signal when the clock signal has a second logic level. The amplification circuit is configured to adjust a current driving force that precharges the output signal based on the reference voltage.