Adaptive Overshoot Suppression Circuit for Fast PA Reference Startup

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Solution Overview

Problem

In 5G systems, power amplifier (PA) circuits face challenges in meeting strict response time requirements while preventing large overshoots in supply voltage, which can impact the performance and lifespan of PA systems.

Innovation Solution

An adaptive overshoot-voltage suppression circuit is introduced, comprising an overshoot-voltage suppression unit and a voltage-to-current conversion unit, which generates a transient high-frequency inducted voltage based on sampling voltage and converts it into a pull-up current to reduce nonlinear starting currents, thereby suppressing overshoots in the reference voltage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If a large overshoot-voltage or current is generated to achieve fast system response, then the response time is improved, but the PA system performance and lifespan deteriorate due to serious impact from large overshoot

Engineering Contradiction:

Improveresponse timeVSAvoidovershoot impact on PA system

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary anti-action by generating a pull-up current in advance through the voltage-to-current conversion unit before the reference circuit starts. This pull-up current counteracts the nonlinear starting current that would otherwise cause large overshoot, thereby preventing harmful effects before they occur while still enabling fast response.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent introduces an intermediary mechanism - the adaptive overshoot-voltage suppression circuit comprising the voltage-to-current conversion unit and overshoot-voltage suppression unit. This intermediary converts the sampling voltage into a pull-up current that mediates between the fast starting current and the PA system, reducing overshoot impact without sacrificing response speed.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Speed

If a reference circuit is designed to respond quickly, then the timing requirement is met, but the reference voltage overshoot increases which affects PA system stability

Engineering Contradiction:

Improvereference circuit response speedVSAvoidreference voltage stability

Core Design Contradiction:

SpeedVSStability of the object's composition

Solution Approach 1:

The patent implements feedback by sampling the reference voltage through the sampling circuit and using this sampled voltage as input to the voltage-to-current conversion unit. The generated pull-up current is fed back to the reference circuit to suppress overshoot, creating a closed-loop control that maintains both fast response and voltage stability.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent changes the parameter of the starting current by converting the sampling voltage into a pull-up current through the voltage-to-current conversion unit. This parameter change transforms the nonlinear starting current into a controlled current that reduces overshoot while maintaining fast response characteristics.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If the nonlinear starting current is reduced, then the overshoot is suppressed, but the starting response time may be extended

Engineering Contradiction:

Improveovershoot suppressionVSAvoidstarting response time

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The patent uses periodic action through the enable circuit that controls the timing of the voltage-to-current conversion unit. The circuit operates in periodic cycles - active during startup to generate pull-up current for overshoot suppression, and inactive during normal operation - thereby maintaining overshoot suppression without continuously affecting response time.

Inventive Principle:

Principle #19Periodic action

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 adaptive overshoot-voltage suppression circuit effectively reduces overshoots in the reference voltage, ensuring quick response and stability while meeting timing requirements, as demonstrated by the reduction in starting current and suppression of reference voltage overshoots.

Implementation Method 1

the overshoot-voltage suppression unit generates a transient high-frequency inducted voltage based on a sampling voltage obtained from the to-be-measured reference circuit

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

The transient high-frequency inducted voltage is converted into a corresponding pull-up current through the voltage-to-current conversion unit

Methodology Applied

Scientific EffectVoltage-to-current conversion: Ohm's Law

Data Source

PatentUS20240143006A1Adaptive overshoot-voltage suppression circuit, reference circuit, chip and communication terminal

Publication Date: 2024.05.02 VANCHIP TIANJIN TECH

AI summary

An adaptive overshoot-voltage suppression circuit (100), a reference circuit, a chip and a communication terminal. The adaptive overshoot-voltage suppression circuit (100) comprises an overshoot-voltage suppression unit (1001) and a voltage-current conversion unit (1002), wherein an input end of the overshoot-voltage suppression unit (1001) is connected to a preset sampling point on a reference circuit to be tested, an output end of the overshoot-voltage suppression unit (1001) is connected to an input end of the voltage-current conversion unit (1002), and an output end of the voltage-current conversion unit (1002) is connected to a preset adjustment point on said reference circuit.