Editorial Technical Reference

Transmitter Circuit

This page explains how Transmitter Circuit is classified within Computer, Electronic and Optical Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

Electronic circuit that generates and modulates radio frequency signals for wireless transmission.

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Product Specifications

Technical details and manufacturing context for Transmitter Circuit

Definition
A transmitter circuit is a critical component within a communication transceiver responsible for converting baseband signals into modulated radio frequency (RF) signals suitable for wireless transmission through antennas. It typically includes stages for signal generation, modulation, amplification, and filtering to ensure proper signal characteristics and compliance with communication standards. The circuit is designed for use in the ISM band (2.4–2.5 GHz) and supports modulation types such as FSK, GFSK, and OOK. It operates with a supply voltage of 3.3–5.0 V DC and consumes 20–50 mA at maximum output. The output power ranges from 10–20 dBm, subject to regulatory limits. The data rate is 1–250 kbps, depending on modulation. The circuit is built on a PCB of typical size 20×30 mm and weighs 5–10 g including shielding. It is designed for industrial-grade operating temperatures from -40 to 85 °C and a non-condensing humidity range of 5–95% RH. The input impedance is matched to 50 Ω, and frequency stability is ±10 ppm over temperature. Harmonic emissions at the second harmonic are -30 dBm, referenced to EN 300 220. The circuit uses semiconductor components (transistors, ICs), a printed circuit board, and passive components (resistors, capacitors, inductors). This directory entry provides reference parameters; actual values must be verified with the legal manufacturer or supplier for the specific model and application. Standards listed are procurement references and do not imply certification or compliance of any specific product.
Working Principle
The transmitter circuit operates by taking input data or audio signals, processing them through modulation techniques (such as AM, FM, or digital modulation), amplifying the modulated signal to sufficient power levels using RF amplifiers, and filtering out unwanted harmonics before feeding the signal to the antenna for radiation into free space. The circuit includes stages for signal generation, modulation, amplification, and filtering. It accepts baseband input, modulates it onto a carrier in the 2.4–2.5 GHz ISM band, amplifies the RF signal to the specified output power, and filters to reduce harmonic emissions. The output is fed to a 50 Ω antenna. The circuit's performance is characterized by parameters such as output power, data rate, and frequency stability, which must be verified for the specific application.
Common Materials
Semiconductor components (transistors, ICs), Printed circuit board (PCB), Passive components (resistors, capacitors, inductors)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Operating Frequency2.4–2.5 GHzISM bandIEEE 802.11
Output Power10–20 dBmRegulatory limits apply
Supply Voltage3.3–5.0 V DCTypical for ICs
Current Consumption20–50 mAAt max output
Modulation TypeFSK, GFSK, OOKSelectable
Data Rate1–250 kbpsDepends on modulation
Operating Temperature-40–85 °CIndustrial gradeIEC 60068-2-1
Humidity Range5–95 % RHNon-condensingIEC 60068-2-78
Input Impedance50 ΩMatched to antenna
Frequency Stability±10 ppmOver temperature
Harmonic Emissions-30 dBmAt 2nd harmonicEN 300 220
PCB Size20×30 mmTypical module
Weight5–10 gIncluding shielding

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Oscillator
    Generates the carrier frequency signal
    Material: Semiconductor crystal
  • Modulator
    Imprints information onto the carrier wave
    Material: Integrated circuit
  • Power Amplifier
    Boosts signal strength for transmission
    Material: RF transistor
  • Filter
    Removes unwanted frequency components
    Material: Ceramic or SAW filter

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1.5 bar
other spec: Frequency Range: 100 MHz to 6 GHz, Power Output: 10 mW to 1 W
temperature: -40°C to +85°C
Media Compatibility
✓ Indoor air environments ✓ Dry gas transmission systems ✓ Non-corrosive industrial enclosures
Unsuitable: High-moisture or corrosive chemical environments
Sizing Data Required
  • Required transmission frequency
  • Desired transmission distance
  • Available power supply voltage

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Signal drift
Cause: Component aging or temperature-induced calibration shift
Circuit board corrosion
Cause: Moisture ingress or chemical exposure in harsh environments
Maintenance Indicators
  • Erratic or unstable output readings
  • Audible humming or buzzing from the transmitter housing
Engineering Tips
  • Implement regular calibration checks using certified reference standards
  • Ensure proper sealing and environmental protection (e.g., NEMA-rated enclosures, desiccants)

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IEC 61000-6-2 CE Marking (EMC Directive 2014/30/EU)

Quoted from the published standard.

Manufacturing Precision
  • Frequency Stability: +/- 0.001%
  • Output Power: +/- 1 dB
Quality Inspection
  • RF Performance Test (Frequency, Power, Modulation)
  • Environmental Stress Screening (Temperature, Humidity, Vibration)

Manufacturers of Transmitter Circuit

Manufacturer profiles associated with Transmitter Circuit.

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Frequently Asked Questions

What is the operating frequency range of this transmitter circuit?

The transmitter circuit operates in the ISM band from 2.4 to 2.5 GHz, as referenced in the directory parameters. This range is commonly used for wireless communication applications such as Wi-Fi and Bluetooth. However, the exact frequency range and compliance with standards must be confirmed with the legal manufacturer or supplier for the specific model.

What modulation types are supported?

The circuit supports FSK (Frequency Shift Keying), GFSK (Gaussian Frequency Shift Keying), and OOK (On-Off Keying) modulation types. These are selectable depending on the application requirements. The choice of modulation affects the data rate and signal robustness, so it should be verified with the manufacturer for the intended use.

What is the typical output power and current consumption?

The output power ranges from 10 to 20 dBm, subject to regulatory limits. At maximum output, the current consumption is between 20 and 50 mA. These values are reference ranges and may vary with the specific model and operating conditions. Always consult the manufacturer's datasheet for precise specifications.

What are the environmental operating limits?

The circuit is rated for industrial-grade operating temperatures from -40 to 85 °C and a non-condensing humidity range of 5–95% RH. These limits are based on IEC 60068-2-1 and IEC 60068-2-78 standards, respectively. However, these are reference values; the actual environmental performance must be verified with the manufacturer for the specific product.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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