Back-Gate Voltage Bias Circuit for Amplifier Power Control
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Solution Overview
Problem
Conventional technologies face challenges in stabilizing power ramping operations in amplifier circuits, particularly in IoT systems, due to the need for complex and costly hardware additions to maintain a desired power ramping profile, and lack an intuitive mechanism for continuously monitoring and adjusting resistance across amplifier transistors.
Innovation Solution
A circuit structure incorporating an error amplifier, a logarithmic current source, and serially coupled transistor cells with a shared substrate, allowing for continuous adjustment of back-gate voltage bias to control resistance and power output, using a closed-loop mechanism that conserves space and reduces component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex hardware additions (additional chips, logic components, look-up tables) are used to achieve power control flexibility and stabilize power ramping, then power control capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the electrical parameters (voltages and currents) within the existing amplifier circuit to achieve power control flexibility. By adjusting the operating point and bias conditions of the transistor, the circuit can operate in different power modes without adding hardware components.
Solution Approach 2:
The amplifier circuit uses its own internal components (transistor, operating point circuit) to automatically control and stabilize power ramping. The circuit self-regulates by monitoring its own operating conditions and adjusting parameters accordingly, eliminating the need for external control chips or logic components.
2Reliability
If active components (transistors) continuously monitor and adjust voltages to maintain desired power ramping profile, then power ramping stability is improved, but device space and operating power consumption increase
Solution Approach 1:
The existing transistor in the amplifier circuit performs multiple functions: it acts as both the power amplifying device and the monitoring/controlling element for power ramping. The same transistor monitors its own operating conditions and adjusts voltages to maintain stable power ramping, eliminating the need for separate active monitoring components.
Solution Approach 2:
The patent merges the power amplification function and the power control/monitoring function into a single integrated circuit structure. The operating point circuit is combined with the amplifier transistor, allowing simultaneous power delivery and self-regulation without requiring additional discrete components that would occupy extra device space.
Data Source
AI summary
Embodiments of the present disclosure provide a circuit structure. An error amplifier of the structure includes an input terminal coupled to a voltage source, a reference terminal, and an output terminal coupled to a back-gate terminal of a power amplifier. A voltage at the output terminal of the error amplifier indicates a voltage difference between the input terminal and the reference terminal. A logarithmic current source may be coupled to the reference terminal of the error amplifier, the logarithmic current being configured to generate a reference current logarithmically proportionate to a voltage level of the voltage source. A plurality of serially coupled transistor cells, having a shared substrate and coupled between the reference terminal of the error amplifier and ground, each may include a back-gate terminal coupled to the output terminal of the error amplifier.