Circuit Device Current Source Antenna Power Stability

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Solution Overview

Problem

Existing circuit devices for wireless communications struggle to stably supply electric power across a broad power range while minimizing dependency on power supply voltage variations, particularly in switching between high and low power modes, which hinders data transmission rates in amplitude modulation using ON/OFF keying methods.

Innovation Solution

A circuit device configuration that includes a current source capable of supplying different currents in various operation modes, along with a drive section that adjusts power output through a matching circuit, allowing for stable power delivery across a broad range by varying current levels and using a choke coil to reduce pulsation and stabilize voltage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If voltage control using operational amplifier is employed to maintain constant output power, then output power stability is improved, but switching time increases

Engineering Contradiction:

Improveoutput power stabilityVSAvoidswitching time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent replaces the operational amplifier-based voltage control system with a current source-based control system. Instead of controlling voltage through an op-amp that requires gradual charging of capacitors, the invention directly controls the output current, enabling faster switching response while maintaining output power stability through direct current regulation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the control parameter from voltage to current. By controlling the output current directly through a current source circuit, the system achieves both fast switching (since current can be changed immediately without capacitor charging delays) and stable output power (through precise current regulation), thereby resolving the contradiction between switching speed and output stability.

Inventive Principle:

Principle #35Parameter changes

2Power

If power amplifier is designed for high power output, then transmission range is improved, but power consumption increases

Engineering Contradiction:

Improveoutput powerVSAvoidpower consumption

Core Design Contradiction:

PowerVSUse of energy by moving object

Solution Approach 1:

The patent implements a dynamic power control system where the current source can adjust its output current level based on communication requirements. The system switches between different current levels (and thus different power levels) dynamically, allowing high power output when needed for extended transmission range while consuming low power during normal operation, thereby resolving the contradiction between transmission range and power consumption.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS9564875B2Circuit device, electronic apparatus, and moving object

Publication Date: 2017.02.07 SEIKO EPSON CORP

AI summary

In order to achieve a circuit device capable of stably supplying an antenna with electric power in a broad power range to output a transmission signal, the circuit device includes a current source adapted to supply a first current in a first operation mode, and supply a second current higher than the first current in a second operation mode, and a drive section supplied with the electric power from the current source, and adapted to perform drive for outputting a transmission signal to an antenna via a matching circuit.