Skip to content

The Student Engineer
C2I Awards
Salary Survey
Latest Issue
Newsletter Signup
Employer Zone
Covid-19

News
In-depth
Opinion
JOBS
Sectors
Supplier Network

Search Login / Register Primary Menu

Close

Login or Register

Supplier Network +Add your company

Supplier Product

Back to previous

I/Q demodulator has 60dB sideband suppression for improved receiver performance

By Analog Devices incorporates Linear Technology on 26th July 201627th July 2016

Product Details Supplier Info More products

Download document:

C-LTC5586 Backgrounder - .DOC file.

Download document:

LTC5586 Presentation - .PPTX file.

Linear Technology has introduced a new high linearity I/Q demodulator, the LTC5586, with more than 1GHz, –1dB flatness bandwidth, supporting next-generation 5G wireless infrastructure equipment such as DPD (digital predistortion correction) receivers for base stations, microwave backhaul and software-defined radios (SDR), as well as other broadband receiver applications. The LTC5586’s RF input port is truly broadband. With a single network, it is 50Ω matched from 500MHz to 6GHz, covering all the LTE bands, as well as the emerging 4.5G and 5G bands at 3.6GHz and 5GHz. For operation from 300MHz to 500MHz, an additional capacitor does the job. The device also has built-in SPI tunability, allowing the demodulator to set its LO input to any frequency band from 300MHz to 6GHz with no external matching components. The new demodulator supports very high OIP2 of 80dBm and 60dBc sideband suppression, ensuring superior receiver performance.

The LTC5586 is a true zero-IF design that demodulates wideband RF signals directly to baseband DC or low IF coupling. The demodulator exploits the quadrature relationship between the two I and Q channels, sufficiently containing all the information available when both channels are sampled at one-half the bandwidth of the full RF bandwidth from which they came. As a result, the A/D converters’ (ADC) sampling rate and cost can be reduced.

In the front end, the LTC5586 has an RF switch that selects one of its two inputs to a programmable attenuator via the on-chip serial bus. This front-end attenuator has a gain-control range of 31dB in 1dB steps, allowing the receiver to accommodate a wide range of signal inputs. The demodulator consists of I and Q mixers, with their respective LO driven by an accurate wideband quadrature phase shifter. After the signal is demodulated, two programmable gain amplifiers provide gains to the I and Q baseband signal paths. Maximum gain of 7.7dB can be set by the serial port in 1dB steps, allowing users to optimally set the signal levels while driving a pair of external A/D converters directly.

Additionally, the LTC5586 has a unique on-chip tuning facility for simple calibration via the SPI serial port. Through this interface, the user can adjust the I and Q amplitude and phase balance, resulting in a much simplified calibration to attain unprecedented 60dBc or better image rejection performance. The same interface can optimise the IIP2, IIP3, HD2 (2nd harmonic distortion) and HD3 performance, improving the overall linearity performance of a receiver. With the device’s baseband DC coupled, its DC offset voltage can be zeroed, including the entire baseband signal chain, so long as the combined total offset is within the adjustment range of the LTC5586.

The LTC5586 comes in a 5 x 5mm plastic QFN package. The I and Q outputs are able to drive directly into a pair of interstage filters and external ADCs when terminated externally with a 100Ω differential impedance. This results in a compact solution, requiring few external components. Operating temperature range is specified from –40°C to 105°C case. The LTC5586 is priced starting at $7.79 each in 1,000-piece quantities and is now available in production quantities.

LTC5586 Presentation

Analog Devices incorporates Linear Technology

Analog Devices (NASDAQ: ADI) is a leading global high-performance analogue technology company dedicated to solving the toughest engineering challenges.

Visit our website 01932 358530

Analog Devices is the leading global high-performance analog technology company dedicated to solving the toughest engineering challenges. We enable our customers to interpret the world around us by intelligently bridging the physical and digital with unmatched technologies that sense, measure, power, connect and interpret. We create innovative solutions to solve design challenges in instrumentation, automation, communications, healthcare, automotive and numerous other industries. The company is a global leader in the design and manufacturing of analog, mixed signal, and DSP integrated circuits to help solve the toughest engineering challenges. Visit http://www.analog.com.

View full profile

Electrical and electronic components

Analog Devices Announces 16-Channel, Mixed-Signal Front-End Digitizer for Reference Design Integration

13th April 2021 12:05 pm 13th April 2021 12:05 pm

Electrical and electronic components

Independent Research Surveys Manufacturing Executives: Real-time Data from Connected Factory is Key to Driving Innovation and Delivering Competitive Advantages

8th April 2021 10:11 am 8th April 2021 10:11 am

Electrical and electronic components

Analog Devices Announces Complete Radio Platform for 5G O-RAN Ecosystem

25th March 2021 4:58 pm 25th March 2021 4:58 pm

Electrical and electronic components

Analog Devices and Arrow Announce Next Monthly Pan-European Webinar to be held on 31st March at 2.00pm (3.00pm CET)

18th March 2021 11:42 am 18th March 2021 11:42 am

Electrical and electronic components

Analog Devices, University of Limerick and Stripe Collaborate to Leverage Software Technology for the Transformation of Engineering Education

3rd March 2021 11:06 am 3rd March 2021 11:06 am

Electrical and electronic components

Analog Devices’ Battery Management System ICs and Automotive Audio Bus Power Volvo’s All Electric XC40 SUV

24th February 2021 10:16 am 24th February 2021 10:30 am

Explore

SECTORS
CAREERS
SKILLS AND CAREERS
POLICY & BUSINESS
VIDEOS
EVENTS
WEBINARS
CLASSIC ARCHIVE
C2I 2020 Winners Book
BACK ISSUES
NEWSLETTER SIGNUP
TECH TRENDS 2021

Twitter
LinkedIn
Instagram
Flip

Advertise
Contact us
Cookies
Digital edition
Magazine subscription
Privacy
Website Terms and Conditions

Copyright © Mark Allen Engineering Ltd (a Mark Allen Group company) 2019

Mark Allen Engineering Limited
Registered Office: Mark Allen Group, St Jude's Church, Dulwich Road, London, SE24 0PB
Registered in England No. 11569365