Field-programmable RF; CMOS multi-standard/multi-band MIMO transceiver

February 12, 2014 // By Graham Prophet
Lime Microsystems has announced its second-generation field programmable RF (FPRF) concept announces its second-generation device, the LMS7002M, built in 65nm CMOS technology to reduce the cost of FPRF transceiver technology and significantly reduce power consumption.

The chip integrates 2 x 2 MIMO functionality and significantly extends the spectrum coverage compared to its predecessor. The LMS7002M supports all cellular standards and frequencies, including 2G, 3G and 4G / LTE and their TDD / FDD variants amongst numerous other standards such as WiFi; use it, Lime says, in a broad range of consumer and professional applications.

The company believes that the flexibility, low power consumption, functionality and price of the LMS7002M FPRF, makes it an “exceptionally disruptive entry” to the transceiver chipset market, offering an advanced transceiver function for a fraction of the cost of existing solutions. You can also “pin-out” connections to use individual functions of the chip in isolation.

 

It features DSP functions, an 8051 microcontroller, multiple 12-bit ADCs and DACs, LNAs, filters, PLLs and mixers to provide the highest level of integration. These elements can also be used as cost-effective standalone parts and the open architecture allows each function – for example, ADC, DAC, DDS, AGC, PLL or RF VGA – to be accessed and used separately. For the most demanding applications, external components can be used to supplement or replace selected integrated functions.

Lime's second-generation FPRF transceiver extends low frequency operational range down to just 50 MHz (previously 300 MHz) supported by the first generation LMS6002D. This gives the chip a continuous operational spectrum of 50 MHz to 3.8 GHz.

The transceiver's advanced capabilities include extensive on-chip DSP, to enhance the analogue gain and filtering with digital control, an important factor in reducing the overall power consumption.

New features, such as the on-chip MCU, simplify the calibration and installation. The chip is programmed by a serial bit stream, and code is designed using a free open source configuration tool suite.

The LMS7002M can operate from a single supply rail of 1.8V with individual blocks capable of being powered down when not required for further power savings. This makes it suitable for a