Semiconductor Sampling Circuit With Constant Switch Impedance Control
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Solution Overview
Problem
Existing electronic sampling systems suffer from signal distortions due to varying switch impedance and sampling jitter, which limit the useful voltage and frequency range of input signals, and are often addressed with additional circuitry that increases power consumption and cost.
Innovation Solution
The proposed solution involves a sampling circuit with a control circuit that applies a predefined charge to maintain constant switch impedance, reducing signal distortion by disconnecting unnecessary circuitry during sampling and using charge pumps to ensure stable switch operation across varying input signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional circuitry is used to address signal distortion and sampling jitter, then measurement precision is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts and eliminates unnecessary circuitry from the sampling system. By removing redundant components and simplifying the circuit architecture, the invention reduces device complexity while maintaining signal acquisition accuracy through optimized switch impedance control and charge pump design.
Solution Approach 2:
The patent changes key operating parameters including switch impedance characteristics and charge pump output voltage. By dynamically adjusting these parameters to maintain constant switch impedance during sampling, the invention improves measurement precision without requiring additional complex circuitry.
2Measurement precision
If additional circuitry is used to address signal distortion and sampling jitter, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent removes unnecessary circuitry that would consume power, keeping only the essential components needed for accurate signal acquisition. The simplified circuit design inherently reduces power consumption while maintaining measurement precision through efficient switch impedance control.
Solution Approach 2:
The patent optimizes operating parameters such as switch impedance and charge pump voltage to maintain constant impedance during sampling. This parameter optimization improves signal acquisition accuracy while minimizing power consumption by avoiding the need for additional active components.
3Device complexity
If switch impedance varies with input signal, then device complexity is reduced, but manufacturing precision deteriorates
Solution Approach 1:
The patent changes the switch impedance parameter from a variable state to a constant state during sampling. By controlling the switch impedance to remain constant regardless of input signal variations, the invention eliminates signal distortion while maintaining simple circuit architecture through optimized control mechanisms.
Solution Approach 2:
The patent introduces a charge pump circuit as an intermediary element that actively controls switch impedance. This mediator component ensures constant switch impedance during sampling, improving manufacturing precision (signal accuracy) without significantly increasing overall device complexity.
4Manufacturing precision
If switch impedance is controlled to be constant, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent changes the switch impedance parameter to be constant during sampling by optimizing control circuit design. The control circuit uses simplified logic to maintain constant impedance, improving signal distortion reduction while avoiding excessive complexity through efficient parameter management.
Solution Approach 2:
The patent designs the control circuit to perform multiple functions simultaneously: controlling switch impedance, coordinating with the charge pump, and managing sampling timing. This multi-functionality approach maintains manufacturing precision (constant impedance) while minimizing device complexity by consolidating control functions into a single integrated 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 approach minimizes signal distortion and sampling jitter, improving the accuracy of signal acquisition and reducing power consumption by maintaining constant switch impedance and eliminating signal-dependent loading.
Implementation Method 1
The control circuitry includes a charge pump circuit that generates a control voltage having a magnitude that maintains a constant gate-to-source voltage across the sampling switch
Implementation Method 2
a sampling switch coupled between the input terminal and a sampling capacitor
Data Source
AI summary
Circuits and methods that improve the performance of electronic sampling systems are provided. Impedances associated with sampling semiconductor switches are maintained substantially constant during sample states, at least in part, by compensating for encountered input signal variations in order to reduce or minimize signal distortion associated with sampled signals that pass through the sampling switch.