Transmission Circuit Temperature Gain Control

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Solution Overview

Problem

Conventional transmission circuits for mobile telephony and wireless LAN face challenges in maintaining signal linearity across broad bandwidths while operating efficiently, particularly due to temperature-induced changes in amplitude modulating section characteristics, leading to increased circuit complexity and power consumption.

Innovation Solution

A transmission circuit design that includes a signal generating section, a regulator, an angle modulating section, a variable gain amplifier, an amplitude modulating section, a temperature detecting section, and a gain control section, which controls the gain of the amplification section based on temperature information to maintain constant characteristics, thereby eliminating the need for complex feedback control and reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional transmission circuits operate within a broad bandwidth, then communication versatility is improved, but signal linearity deteriorates due to temperature changes

Engineering Contradiction:

ImprovebandwidthVSAvoidsignal linearity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The temperature detecting section continuously monitors the temperature of the amplitude modulating section before signal transmission, and the gain control section pre-adjusts the gain based on detected temperature to compensate for upcoming nonlinearity effects, maintaining signal linearity across broad bandwidth operations

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention implements a feedback mechanism where the temperature detecting section provides real-time temperature information to the gain control section, which continuously adjusts the gain of the amplification section to compensate for temperature-induced nonlinearity, ensuring stable signal characteristics across varying temperatures and bandwidths

Inventive Principle:

Principle #23Feedback

2Reliability

If predistortion compensating section is added to compensate for nonlinearity, then signal linearity is improved, but device complexity increases

Engineering Contradiction:

Improvesignal linearityVSAvoidcircuit complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention changes the gain parameter of the amplification section based on temperature measurements, using a simple gain control mechanism instead of complex predistortion filtering circuits, thereby maintaining signal linearity while minimizing circuit complexity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention replaces complex mechanical or electronic predistortion compensation mechanisms with a simpler temperature-based gain control system, where the gain control section adjusts amplification parameters based on temperature feedback, achieving linearity compensation with reduced circuit complexity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If feedback control is implemented to maintain linearity, then signal accuracy is improved, but power consumption increases

Engineering Contradiction:

Improvesignal accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The invention adjusts the gain parameter based on temperature conditions rather than implementing continuous complex feedback control, reducing power consumption while maintaining signal accuracy through temperature-compensated gain adjustment

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS7583940B2Transmission circuit and communication apparatus employing the same

Publication Date: 2009.09.01 INTEL CORP

AI summary

A transmission circuit is provided which can output a stable transmission signal independently of the temperature characteristics of an amplitude modulating section. A signal generating section generates an amplitude signal and a phase signal. A regulator supplies a voltage which is controlled, depending on the amplitude signal, to the amplitude modulating section. An angle modulating section subjects the phase signal to angle modulation to output an angle-modulated signal. A temperature detecting section outputs temperature information of the amplitude modulating section. A gain control section controls a gain of a variable gain amplifier based on the temperature information of the amplitude modulating section. The variable gain amplifier amplifies the angle-modulated signal using the gain controlled by the gain control section. The amplitude modulating section subjects the angle-modulated signal to amplitude modulation using a voltage which is controlled, depending on the amplitude signal, to output an amplitude-modulated signal.