Low IF 1,5 Mbps transceiver chip

22 May 2002 Telecoms, Datacoms, Wireless, IoT

The ML2722 can be used as a single chip Direct Sequence Spread Spectrum (DSSS) transceiver or general purpose Frequency Shift Keying (FSK) radio transceiver. This Micro Linear device is designed to work in the 902 to 928 MHz ISM band. The device integrates all the frequency generation, receive and transmit functions for data rates up to 1,5 Mbps or for DSSS at 1,5 Mbps. A complete radio only requires the addition of a RX/TX switch.

The ML2722 contains a proprietary low IF receiver with all filters integrated. An image reject mixer brings the 915 MHz RF signal down to a low IF frequency of 1,024 MHz. All IF filtering, IF gain, and demodulation is then performed at 1 MHz. This architecture provides all the benefits of direct conversion to baseband, and reduces the need for RF filtering. The ML2722 can operate with either a low-cost LC or SAW RF filter.

A single 1,83 GHz synthesizer is used for both the receiver LO and the transmitter. The ML2722 transmitter modulates the VCO with filtered data, and a drive amplifier provides typically 0 dBm at 915 MHz. The VCO and PLL incorporate the resonator, the active devices, and the tuning circuitry for a completely integrated function. An internal receive data filter and data slicer are integrated.

The ML2722 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 (Receiver Signal Strength Indication).

Further reading:

Wireless connectivity expanded
iCorp Technologies Telecoms, Datacoms, Wireless, IoT
Espressif Systems has introduced two new members of its ESP32 wireless SoC family: the ESP32-E22, the company’s first Wi-Fi 6E connectivity chip, and the ESP32-H21, an ultra-low-power Bluetooth LE microcontroller aimed at coin-cell and battery-powered devices.

Read more...

---

Integrated X-band radar front-end module
RF Design Telecoms, Datacoms, Wireless, IoT
Qorvo has introduced an X-band radar front-end solution that enables defence system designers to achieve higher performance without increasing size, weight or prime power.

Read more...

---

Introducing Aurata
CST Electronics Telecoms, Datacoms, Wireless, IoT
Antenova has launched Aurata SR4L112: a compact, high efficiency embedded 4G/LTE antenna engineered for long, narrow PCB designs.

Read more...

---

Multi-constellation GNSS module in a legacy-compatible footprint
Altron Arrow Telecoms, Datacoms, Wireless, IoT
Telit Cinterion has announced the SE869eK2L, a single-frequency L1 GNSS module designed to help device manufacturers upgrade legacy positioning designs with improved performance and cost efficiency, while preserving design continuity.

Read more...

---

Quectel expands 5G portfolio
iCorp Technologies Telecoms, Datacoms, Wireless, IoT
Quectel expands 5G portfolio with new Qualcomm- and UNISOC-based modules.

Read more...

---

Compact RTK design: More than just the receiver
iCorp Technologies Editor's Choice Telecoms, Datacoms, Wireless, IoT
In practice, engineers building compact RTK products keep discovering the same thing: the hardest component in the system is no longer the receiver. It is the antenna.

Read more...

---

Microchip advances Space-Grade timing performance
ASIC Design Services Telecoms, Datacoms, Wireless, IoT
Microchip Technology has expanded its atomic clock portfolio with the radiation-tolerant Space CSAC-SA65, a Chip Scale Atomic Clock designed to deliver precise timing for space systems.

Read more...

---

Channel emulator for 6 G and Wi-Fi 7/8
Concilium Technologies Telecoms, Datacoms, Wireless, IoT
With 400 MHz instantaneous bandwidth and support for carrier frequencies up to 23,6 GHz, Vertex 6.0 is the industry’s first channel emulator designed for next generation 6 G and Wi-Fi 7/8 testing.

Read more...

---

Secure, low-power Bluetooth LE SoC
NuVision Electronics Telecoms, Datacoms, Wireless, IoT
Silicon Labs unveils BG2B, its lowest-power Bluetooth LE SoC with industry-leading power efficiency, security, and integration.

Read more...

---

High-isolation RF switch optimised for broadband cable
Telecoms, Datacoms, Wireless, IoT
pSemi Corporation has announced the PE42727 UltraCMOS SPDT RF Switch, a high-isolation solution optimised for next generation broadband cable applications.

Read more...

---