I/Q Modulator achieves 30.9 dBm output third-order intercept.September 21, 2010 -
Supplied in 4 x 4 mm QFN package, LTC5588-1 operates over 200 MHz to 6 GHz range and offers linearity performance of 30.9 dBm OIP3 (Output Third-Order Intercept) at 2.14 GHz. Capability for calibration via single-pin adjustment with DC input voltage further optimizes OIP3 to 35.1 dBm. Along with noise floor of -160.6 dBm/Hz at 6 MHz offset and image suppression of -56.6 dBc at 2.14 GHz, characteristics include carrier leakage of -39.6 dBm while delivering 5 dBm signal power to output.
(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)
Original Press release
Linear Technology Corp.
1630 McCarthy Blvd.
Milpitas, CA, 95035
USA
"A 200MHz to 6GHz Direct Conversion I/Q Modulator Achieves 30.9dBm Output Third-Order Intercept
MILPITAS, CA - 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 common-mode 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.
Summary of Features: LTC5588-1
Operating Frequency Range
- 200MHz to 6GH
Output IP3
- at 900MHz:
-31.3 dBm
- at 900MHz (Optimized):
35.1 dBm
Output IP3
- at 2.14GHz:
30.9 dBm
- at 2.14GHz (Optimized):
35.1 dBm
Output IP2
- at 2.14GHz:
58.5 dBm
Easy Single-Pin Calibration To Optimize OIP3
Noise Floor at 6MHz Offset
- -160dBm/Hz
Image Suppression
- at 2.14GHz:
-56.6 dBc (uncalibrated)
Carrier Leakage
- (POUT = 5dBm):
-39.6 dBm
Low Power Consumption
- Single 3.3V, 300mA
Small Package
- 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, µModule® 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, µModule and are registered trademarks of Linear Technology Corp. All other trademarks are the property of their respective owners.
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