2,4 GHZ low IF 1,5 Mbps transceiver
14 August 2002
Telecoms, Datacoms, Wireless, IoT
The ML2725 from Micro Linear can be used as a single chip direct sequence spread spectrum (DSSS) telephone transceiver or general purpose frequency shift keying (FSK) radio transceiver. It is designed to work in frequency ranges of 2,4 GHz. The device integrates the frequency generation, receive and transmit functions for data rates up to 1,5 Mbps.
The ML2725 contains a proprietary dual conversion low IF receiver with all channel selectivity. The first mixer converts the 2,4 GHz RF input signal to a high IF of 800 MHz. An image reject mixer brings the 800 MHz IF signal down to a low IF frequency of 1,024 MHz, so all IF filtering, IF gain, and demodulation is performed at 1,024 MHz. This provides all the benefits of direct conversion to baseband and minimises the need for RF filtering. Also, the ML2725 can operate with either a low cost LC filter or a SAW filter.
A single 1,6 GHz synthesizer is used for both the receiver LO and the transmitter signal generation. The VCO and PLL are completely integrated, including the VCO resonator and tuning circuits. On transmit, the ML2725 is intended to be used with an external frequency tripler. The transmit output frequency is nominally 800 MHz, with a typical output power of 0 dBm. Transmit data is used to frequency modulate the VCO with the synthesizer open loop. The transmit data filter and modulation compensation circuits are also integrated.
The ML2725 contains its own DC regulation which allows the IC to operate over a wide power supply voltage range. It also has a simple baseband interface for transmit power management, PLL control and detection, and RSSI.
Further reading:
Industrial Ethernet time sensitive networking switch
RS South Africa
Telecoms, Datacoms, Wireless, IoT
The ADIN3310 and ADIN6310 are 3-port and 6-port Gigabit Ethernet time sensitive networking (TSN) switches with integrated security primarily designed for industrial Ethernet applications.
Read more...
When it comes to long-term reliability of RF amplifier ICs, focus first on die junction temperature
Altron Arrow
Editor's Choice Telecoms, Datacoms, Wireless, IoT
When considering the long-term reliability of integrated circuits, a common misconception is that high package or die thermal resistance is problematic. However, high or low thermal resistance, by itself, tells an incomplete story.
Read more...
Automotive-grade digital isolators
Telecoms, Datacoms, Wireless, IoT
The NSI83xx series of capacitive-based isolators from NOVOSENSE Microelectronics offer superior EOS resilience and minimal power noise susceptibility.
Read more...
Why bis means business for LTE Cat 1 IoT connections
NuVision Electronics
Editor's Choice Telecoms, Datacoms, Wireless, IoT
Tomaž Petaros, product manager IoT EMEA at Quectel Wireless Solutions explains why the market for Cat 1bis IoT connections is getting busy.
Read more...
Wi-Fi in 2025: When is Wi-Fi 7 the answer?
iCorp Technologies
Telecoms, Datacoms, Wireless, IoT
Wi-Fi 7 introduces multi-link operation and lower latency, a game-changing feature that allows devices to transmit and receive data across multiple frequency bands simultaneously to significantly reduce network congestion.
Read more...
Bluetooth Lite SoCs purpose built for IoT
NuVision Electronics
Telecoms, Datacoms, Wireless, IoT
Whether it is enabling predictive maintenance on industrial equipment, tracking assets in dense environments, or running for years on a coin cell battery in ultra-low power sensors, developers need solutions that are lean, reliable, and ready to scale with emerging use cases.
Read more...
LTE Cat 1bis module
Otto Wireless Solutions
Telecoms, Datacoms, Wireless, IoT
The A7673X LTE Cat 1bis module from SimCom is engineered to meet the growing demands of the IoT industry, offering exceptional performance and seamless integration.
Read more...
Track with precision
Electrocomp
Telecoms, Datacoms, Wireless, IoT
KYOCERA AVX provides innovative antennas for cellular, LTE-M, NB-IoT, LoRa, GNSS, BLE, UWB, Wi-Fi, and future Satellite IoT.
Read more...
Wi-Fi 7 front-end module
RF Design
Telecoms, Datacoms, Wireless, IoT
The Qorvo QPF4609 is an integrated front end module designed for 802.11be systems that has integrated matching, which minimises layout area.
Read more...
Multi-channel downconverter
Vepac Electronics
Telecoms, Datacoms, Wireless, IoT
The Downconverter from Crane Aerospace is a converter that operates from 2 to 18 GHz and delivers a noise figure of 11 dB with an attenuation range of 25 dB.
Read more...