Current-Pump Transmitter Circuit for Adjustable Voltage Slew Rates
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Solution Overview
Problem
Conventional transmitter circuits require complex designs and increased costs to adjust voltage slew rates, complicating the manufacturing process and circuit design.
Innovation Solution
A transmitter circuit incorporating capacitances, current pump circuits, and voltage clamping circuits that allow for adjustable voltage slew rates through controlled charging and discharging, simplifying the circuit structure and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional voltage suppliers or current suppliers are used to adjust voltage output and current output, then the voltage slew rate can be controlled, but the circuit structure becomes complicated and manufacturing costs increase
Solution Approach 1:
The patent changes the control parameter from complex voltage suppliers to simple current pumps with fixed current outputs. By varying the capacitance values (C1, C2) and resistance values (R1, R2, R3, R4) in the RC circuits, the voltage slew rate is adjusted without changing the fundamental circuit structure. This allows slew rate control while maintaining circuit simplicity.
Solution Approach 2:
The patent uses inexpensive, simple components (current pumps, capacitors, resistors, voltage clamping circuits) instead of complex, expensive voltage suppliers. The current pumps provide fixed current outputs that, when combined with passive RC elements, achieve the desired voltage slew rate control at low cost and with simple circuitry.
2Reliability
If conventional voltage suppliers or current suppliers are used to adjust voltage output and current output, then the voltage slew rate can be controlled, but the manufacturing process becomes complicated and costs increase
Solution Approach 1:
The patent simplifies manufacturing by using standard passive components (capacitors and resistors) with adjustable values, rather than requiring complex voltage suppliers. The voltage slew rate is controlled by selecting appropriate RC time constants, which are straightforward to manufacture and adjust in standard semiconductor fabrication processes.
Solution Approach 2:
The patent employs simple, inexpensive components that are easy to manufacture in large quantities using standard semiconductor processes. The current pumps, capacitors, resistors, and voltage clamping circuits can be fabricated using conventional CMOS or bipolar technology, significantly simplifying the manufacturing process compared to complex voltage suppliers.
3Ease of manufacture
If simple circuit structures are used, then manufacturing costs are reduced, but the ability to adjust voltage slew rate is limited
Solution Approach 1:
The patent achieves voltage slew rate adjustment by changing the parameters of simple RC circuits. By varying the capacitance values (C1, C2) and resistance values (R1, R2, R3, R4), different voltage slew rates can be obtained from the same simple circuit structure, providing adaptability without increasing circuit complexity.
Solution Approach 2:
The patent creates a universal circuit structure that can produce different voltage slew rates through parameter adjustment. The same basic architecture (current pumps charging capacitors through resistors with voltage clamping) can be used for multiple applications requiring different slew rates, simply by changing component values rather than redesigning the 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
The solution enables a simple and cost-effective adjustment of voltage slew rates, simplifying the circuit structure and reducing manufacturing costs while maintaining control over slew rate adjustments.
Implementation Method 1
The first current pump circuit is electrically connected to the first terminal of the first capacitance and configured to charge the first capacitance or discharge the first capacitance in accordance with a first input signal to allow the first terminal of the first capacitance to output a first voltage
Implementation Method 2
The first voltage clamping circuit is electrically connected to the first terminal of the first capacitance... When the first voltage or the second voltage reaches the low reference voltage or the high reference voltage, the first current pump circuit stops charging or discharging the first capacitance in accordance with the voltage clamping of the first voltage clamping circuit
Data Source
AI summary
A transmitter circuit is provided in the present disclosure. The transmitter circuit includes a first capacitance, a first current pump circuit for charging or discharging the first capacitance to output a first voltage, a second capacitance, and a second current pump circuit for charging or discharging the second capacitance to output a second voltage. A charging rate at which the first current pump circuit charges the first capacitance or a discharging rate at which the first current pump circuit discharges the first capacitance determines a rising slew rate or a falling slew rate of the first voltage. A charging rate at which the second current pump circuit charges the second capacitance or a discharging rate at which the second current pump circuit discharges the second capacitance determines a rising slew rate or a falling slew rate of the second voltage.