Differential Voltage Generation Circuit With Isolated Capacitors
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Solution Overview
Problem
Existing methods for generating differential voltage suffer from common-mode interferences due to asymmetric signal generation, which are exacerbated by temperature and aging effects, leading to interference with differential signal transfer.
Innovation Solution
The use of electrically isolated capacitors and switches allows for controlled charging and discharging to maintain consistent current flow between terminals, enabling switches to operate with a time delay without inducing common-mode signals, ensuring equal absolute current values at terminals L and H.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If switches S1 and S2 are closed simultaneously to generate differential voltage, then the differential signal is generated, but common-mode interferences occur due to asymmetric current flow caused by temperature and aging variations
Solution Approach 1:
Capacitors C1 and C2 are pre-charged to equal voltages before the differential signal generation phase. This preliminary charging ensures that when switches S1 and S2 close, both capacitors provide identical current impulses to terminals L and H, creating perfectly symmetric current flow that eliminates common-mode interferences even though the switches close at slightly different times
Solution Approach 2:
The patent changes the electrical parameters (voltage and charge) of capacitors C1 and C2 to equal values before signal generation. By controlling the charging voltage and duration of both capacitors to be identical, the resulting current flow I1 and I2 becomes equal in magnitude, ensuring symmetric differential signaling that prevents common-mode interference
2Measurement precision
If switches S1 and S2 operate with time delay, then switching accuracy is improved, but asymmetric current flow is generated causing common-mode signals
Solution Approach 1:
The capacitors are charged in advance to equal voltages before the differential signaling operation. This preliminary charging action ensures that even when switches S1 and S2 close at different times, both capacitors start with identical energy reserves, producing equal current magnitudes that maintain symmetry and prevent common-mode signals despite the time delay
Solution Approach 2:
Capacitors C1 and C2 act as intermediary energy storage elements between the voltage source and the differential output terminals. They decouple the switching timing from the current magnitude relationship, allowing switches to operate with time delay while the capacitors ensure equal current flow by providing pre-stored equal charges
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 effectively prevents common-mode interferences, maintaining signal integrity by ensuring consistent current flow and voltage levels, even with temperature and aging variations.
Implementation Method 1
a first capacitor C1 connected between a potential VCC and ground GND
Implementation Method 2
a first switch S1 and a second switch S2 connected in parallel to each other between the capacitor C1 and the terminals L and H
Data Source
AI summary
A circuit and a method are described for generating differential voltages.