Optical Modulator Driver Circuit With Single-Supply Amplifier Staging
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Solution Overview
Problem
Existing driver circuits for optical modulators in optical communication systems require multiple power supply voltages, leading to increased costs and power consumption, making it difficult to achieve lower power consumption operations while maintaining component and implementation efficiency.
Innovation Solution
A driver circuit design that connects multiple amplifiers to a single power supply voltage, with a higher voltage supplied to later-stage amplifiers, reducing power consumption by optimizing power supply connections and eliminating the need for separate power supply circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple power supply voltages are used for different amplifiers, then power consumption is reduced, but device complexity and component costs increase
Solution Approach 1:
The patent merges multiple power supply voltage requirements into a single power supply system. By cascading amplifiers where the power supply terminal of one amplifier connects to the ground terminal of the next amplifier, the system achieves multiple effective voltage levels from a single power supply, reducing component complexity while maintaining energy efficiency.
Solution Approach 2:
The patent segments the power supply function across multiple amplifier stages. Each amplifier operates at a different voltage level relative to ground, with intermediate stages using the output of previous stages as their reference. This segmentation allows each amplifier to operate optimally at its required voltage while using a unified power supply architecture.
2Use of energy by moving object
If multiple power supply voltages are used for different amplifiers, then power consumption is reduced, but manufacturing costs increase
Solution Approach 1:
The patent combines multiple power supply requirements into a single power supply component. This reduces the bill of materials and simplifies manufacturing processes, as fewer discrete power supply components need to be sourced, mounted, and tested, thereby reducing manufacturing costs while maintaining the power consumption benefits of multiple voltage levels.
3Device complexity
If a single power supply voltage is used for all amplifiers, then device complexity is reduced, but power consumption increases
Solution Approach 1:
The patent introduces dynamic voltage referencing where each amplifier stage operates with a different voltage reference point. The ground terminal of one amplifier becomes the power supply terminal for the next, creating a dynamic voltage hierarchy that reduces power consumption in later stages while maintaining a simple single-power-supply external interface.
Data Source
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AI summary
A positive-side power supply terminal (1-1a) of a differential amplifier (1-1) is connected to a positive-side power supply line (L1). A negative-side power supply terminal (1-2b) of a differential amplifier (1-2) is connected to a negative-side power supply line (L2). A negative-side power supply terminal (1-1b) of the differential amplifier (1-1) and a positive-side power supply terminal (1-2a) of the differential amplifier (1-2) are connected to each other. A final-stage amplifier (2) is connected between the positive-side power supply line (L1) and the negative-side power supply line (L2).