Sampling Switch Precharge for Low-Distortion Wide-Range Acquisition
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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 voltage levels, thereby minimizing impedance variations and sampling jitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional circuitry is added to reduce signal distortion and sampling jitter, then signal acquisition accuracy is improved, but power consumption increases
Solution Approach 1:
The patent changes the operating parameters of the sampling switch by applying a predefined charge to maintain constant switch impedance. This parameter change allows the switch to operate in an optimized regime that reduces signal distortion and sampling jitter without requiring additional complex circuitry, thereby improving signal acquisition accuracy while avoiding increased power consumption
Solution Approach 2:
The patent extracts and eliminates unnecessary circuitry from the sampling system by using a minimal approach that applies predefined charge to the switch. This removal of extraneous components reduces power consumption while the core function of reducing signal distortion is maintained through the predefined charge mechanism
2Device complexity
If switch impedance is not maintained constant, then circuit complexity is reduced, but signal distortion increases
Solution Approach 1:
The patent applies a predefined charge to the sampling switch to maintain constant switch impedance throughout the sampling process. This parameter control eliminates signal distortion caused by varying impedance while keeping the circuit design simple and avoiding additional complex circuitry
Solution Approach 2:
The patent performs preliminary action by pre-charging the sampling switch to a specific impedance state before the sampling operation begins. This preliminary charge application ensures that the switch maintains constant impedance during sampling, preventing signal distortion without requiring complex real-time control circuitry
3Ease of operation
If sampling switch impedance varies with input signal, then ease of operation is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent changes the switch operation mode from signal-dependent impedance variation to constant impedance by applying a predefined charge. This parameter change maintains ease of operation as the switch is still controlled by a simple control signal, while simultaneously improving manufacturing precision by eliminating signal distortion through constant impedance
4Object-generated harmful factors
If charge pumps are used to maintain constant switch impedance, then signal distortion is reduced, but device complexity increases
Solution Approach 1:
The patent applies a predefined charge to the sampling switch to maintain constant impedance, which reduces signal distortion. The predefined charge approach is implemented with minimal circuitry, avoiding the need for complex charge pump circuits while still achieving the benefit of constant impedance and reduced signal distortion
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 significantly reduces signal distortion and sampling jitter, improving the accuracy and precision of signal acquisition across a wider range of input signals without increasing power consumption or cost.
Implementation Method 1
using charge pumps to ensure stable switch operation across a wide range of input signals
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.