RF Transmitters

Part Number	Description / PDF	Quantity
PCF7941ETT/M2AB300 NXP Semiconductors	IC REMOTE KEYLESS ENTRY 20TSSOP	0
PCF7953PTTM1AC1800 NXP Semiconductors	IC KEYLESS ENTRY/GO 28TSSOP	2421
PCF7941ATTM2AB1200 NXP Semiconductors	IC REMOTE KEYLESS ENTRY 20TSSOP	0
JN5148-001-M/00T534 NXP Semiconductors	RF TXRX MOD 802.15.4 TRACE ANT	573
PCF7922ATT/D1AE07J NXP Semiconductors	IC REMOTE KEYLESS ENTRY 20TSSOP	0
PCF7945MTT/C1AC220 NXP Semiconductors	IC MCU RISC 28TSSOP	0
PCF7945VTT/C1AC190 NXP Semiconductors	IC MCU RISC 28TSSOP	0
PCF7945XTT/C1AC200 NXP Semiconductors	IC MCU RISC 28TSSOP	0
PCF7921ATSM2AB1200 NXP Semiconductors	IC RF REMOTE WIRELESS 20-SSOP	0
PCF7961ETT/D1AE16J NXP Semiconductors	IC REMOTE KEYLESS ENTRY 20TSSOP	0
PCF7953XTTC1AC2000 NXP Semiconductors	IC KEYLESS ENTRY/GO 28TSSOP	2470
PCF7945ATTM1AC1500 NXP Semiconductors	IC MCU RISC 28TSSOP	0
PCF7945PTTM1AC1800 NXP Semiconductors	IC MCU RISC 28TSSOP	0
PCF7921ATTM2AB1200 NXP Semiconductors	IC RF REMOTE WIRELESS 20-TSSOP	0
PCF7953ATTM1AC1500 NXP Semiconductors	IC KEYLESS ENTRY/GO 28TSSOP	2400
PCF7953MTTC1AC2200 NXP Semiconductors	IC KEYLESS ENTRY/GO 28TSSOP	2325
PCF7953VTTC1AC1900 NXP Semiconductors	IC KEYLESS ENTRY/GO 28TSSOP	0
PCF7938XA/LAAB3800 NXP Semiconductors	IC REMOTE KEYLESS ENTRY PLLMC	0
PCF7961MTT/D1AE13J NXP Semiconductors	IC REMOTE KEYLESS ENTRY 20TSSOP	0
PCF7941MTT/C2AB410 NXP Semiconductors	IC MCU RISC 20TSSOP	0

RF Transmitters

1. Overview

RF (Radio Frequency) transmitters are electronic devices that generate and transmit high-frequency electromagnetic waves for wireless communication. IF (Intermediate Frequency) components process signals at intermediate stages in transceivers. RFID (Radio Frequency Identification) RF transmitters specifically enable contactless data exchange between tags and readers. These technologies form the backbone of modern wireless systems, supporting applications from mobile communications to IoT networks.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
ISM Band Transmitters	Unlicensed operation at 2.4 GHz/900 MHz	Wi-Fi routers, Bluetooth devices
Cellular Transmitters	5G/LTE protocol support with power control	Smartphones, base stations
UHF RFID Readers	860-960 MHz frequency agility	Warehouse inventory systems
HF RFID Modules	13.56 MHz contactless payment support	Access control terminals

3. Structure and Components

Typical RF transmitter architecture includes: Power Amplifier (PA) for signal boosting, Voltage-Controlled Oscillator (VCO) for frequency generation, modulator for data encoding, impedance matching networks, and antenna interfaces. Advanced systems integrate DSP cores for digital modulation (QAM, OFDM) and temperature-compensated crystal oscillators (TCXO) for stability. RFID variants add protocol-specific encoding circuits and impedance-tuned front-ends.

4. Key Technical Specifications

Parameter	Significance
Frequency Range: 300 MHz - 6 GHz	Determines application compliance (e.g., FCC Part 15.247)
Output Power: 0.1 - 30 dBm	Affects transmission distance and regulatory class
Modulation Accuracy: EVM < 5%	Ensures data integrity in dense environments
Current Consumption: 5-100 mA	Battery life consideration for IoT devices

5. Application Fields

Telecommunications: 5G small cells, satellite modems
Logistics: UHF RFID for supply chain tracking
Healthcare: Medical implant telemetry systems
Retail: NFC payment terminals (13.56 MHz HF RFID)

Case Study: Amazon's warehouse robots use 868 MHz RFID readers for real-time inventory with 5 cm accuracy.

6. Leading Manufacturers and Products

Vendor	Representative Product
TI (Texas Instruments)	CC1352P7 multi-band wireless MCU
Nordic Semiconductor	nRF52840 Bluetooth 5.3 SoC
Impinj	R420 UHF Gen2 RFID reader
STMicroelectronics	CR95HF NFC/RFID transceiver

7. Selection Guidelines

Determine regulatory requirements (FCC/ETSI compliance)
Match frequency to use case (e.g., 900 MHz for liquid penetration)
Evaluate environmental factors (temperature, interference)
Assess protocol compatibility (LoRaWAN, BLE 5.4)
Optimize power vs. range trade-offs

8. Industry Trends

Key developments include: - 5G integration with sub-6 GHz RF front-ends - RFID moving to microwave frequencies (2.45 GHz active tags) - AI-enhanced spectrum sensing for dynamic frequency selection - Miniaturization via SiP (System-in-Package) technology - Energy harvesting transmitters for battery-free IoT