Amplifier Output Translator Circuit for Mixed-Voltage Loads
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Solution Overview
Problem
Amplifier circuits often produce output signals with values greater than the common return voltage, leading to improper operation of load circuits, and the high output signal values are similar to the input voltage, causing operational issues in applications with different voltage loads.
Innovation Solution
The implementation of a translator circuit that operates from a second operating voltage lower than the first, forming an output signal that is representative of the input signal but at a lower voltage, using a voltage follower configuration with NMOS transistors to ensure the output voltage is no greater than the second operating voltage, and a reference circuit to control a gain transistor to sink current from the load, maintaining the output voltage near the common return voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the amplifier circuit directly outputs the amplified signal, then the output signal has a high value similar to the input voltage, but this causes improper operation of load circuits that operate from different voltages
Solution Approach 1:
A translator circuit is introduced as an intermediary between the amplifier circuit and the load circuit. This translator circuit receives the high-level output signal from the amplifier and converts it to a lower voltage level that is compatible with load circuits operating from different voltages, thereby enabling proper operation without directly connecting the amplifier output to diverse load requirements
2Power
If the output signal has a low value much greater than the common return voltage, then the signal level is high, but this causes improper operation of the load circuit
Solution Approach 1:
The translator circuit changes the voltage level parameter of the output signal. It takes the high-level signal from the amplifier and transforms it into a lower voltage level that is appropriate for the load circuit's operating requirements, thereby maintaining both high signal level and proper load operation
Data Source
AI summary
In one embodiment, an amplifier circuit may be configured with an output transistor that forms an output current and an output voltage at an output. The amplifier circuit may also include a reference circuit that may be configured to form a reference current that is substantially proportional to the output current. An embodiment of the reference circuit may also be configured to control a transistor to sink current from the output in response changes in the reference current.