A 200MHz to 6GHz Direct Conversion I/Q Modulator Achieves 30.9dBm Output Third-Order Intercept

News Release ⎜ www.linear.com
A 200MHz to 6GHz Direct Conversion I/Q Modulator
Achieves 30.9dBm Output Third-Order Intercept
MILPITAS, CA – September 14, 2010 – Linear Technology introduces the LTC5588-1, a new
generation ultra-high linearity direct conversion I/Q modulator that operates over a wide
frequency range from 200MHz to 6GHz. The new modulator offers best-in-class linearity
performance of 30.9dBm OIP3 (Output Third-Order Intercept) at 2.14GHz – without calibration.
The device also has the unique capability for simple calibration by a single-pin adjustment with a
DC input voltage that further optimizes its OIP3 up to 35.1dBm. The LTC5588-1’s linearity
performance is complemented with a noise floor of -160.6dBm/Hz at 6MHz offset, enabling
transmitters to achieve unprecedented dynamic range performance.
The LTC5588-1 offers image suppression of -56.6dBc at 2.14GHz. In addition, its carrier
leakage is -39.6dBm while delivering 5dBm signal power to its output without calibration. Over
the operating temperature range from -40°C to 85°C, both parameters exhibit stable behavior,
varying only about +/-3dB. Its performance satisfies the system requirements of the most
demanding broadband wireless 4G basestations, including LTE, WiMAX, multi-carrier
GSM/EDGE, W-CDMA, TD-SCDMA, CDMA-2000 and CDMA, as well as other high
performance wireless applications.
The LTC5588-1’s I and Q inputs are biased to a 0.5V DC common-mode voltage that is
directly compatible with commercially available D/A converters that have similar DC commonmode voltage. The I and Q inputs support signal bandwidth greater than 400MHz.
The LTC5588-1 is powered from a single 3.3V supply with an operating current of
300mA. The device has an Enable pin, allowing the chip to power down completely. In
shutdown mode, the device draws a sleep current of less than 900uA. The modulator has fast
turn-on and turn-off time, at 15ns and 5ns, respectively, supporting TDD (Time Division
Duplexing) mode of operation. The LTC5588-1 comes in a compact 4mm x 4mm 24-pin QFN
package and is available immediately from stock, priced starting at $5.70 each in 1,000 piece
quantities. For more information, visit www.linear.com/5588.
A 200MHz to 6GHz Direct Conversion I/Q Modulator
Achieves 30.9dBm Output Third-Order Intercept
page 2
Photo Caption: 200MHz to 6GHz Direct Quadrature Modulator with Ultrahigh OIP3
Summary of Features: LTC5588-1
Operating Frequency Range
Output IP3 at 900MHz
at 900MHz (Optimized)
Output IP3 at 2.14GHz
at 2.14GHz (Optimized)
Output IP2 at 2.14GHz
Easy Single-Pin Calibration To Optimize OIP3
Noise Floor at 6MHz Offset
Image Suppression at 2.14GHz
Carrier Leakage (POUT = 5dBm)
Low Power Consumption
Small Package
200MHz to 6GHz
31.3 dBm
35.1 dBm
30.9 dBm
35.1 dBm
58.5 dBm
-56.6 dBc (uncalibrated)
-39.6 dBm
Single 3.3V, 300mA
4mm x 4mm QFN
About Linear Technology
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits,
was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major
public companies in 2000. Linear Technology products include high performance amplifiers,
comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery
chargers, data converters, communications interface circuits, RF signal conditioning circuits,
uModule® products, and many other analog functions. Applications for Linear Technology’s
high performance circuits include telecommunications, cellular telephones, networking products
such as optical switches, notebook and desktop computers, computer peripherals,
video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer
products such as digital cameras and MP3 players, complex medical devices, automotive
electronics, factory automation, process control, and military and space systems.
LT, LTC, LTM, uModule and
are registered trademarks of Linear Technology Corp. All other trademarks are the
property of their respective owners.
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Tel 408-432-1900 ext 2419
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Doug Dickinson, Media Relations Manager
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408-432-1900 ext 2233