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I/Q demodulator offers 700MHz to 3GHz frequency

Posted: 01 Feb 2012 ?? ?Print Version ?Bookmark and Share

Keywords:I/Q demodulator? LTE? multimode?

Linear Technology Corp. has introduced an ultrawide bandwidth direct conversion I/Q demodulator that is capable of baseband output demodulation bandwidth higher than 530MHz. According to the company, the LTC5585 supports new generation wideband LTE multimode receivers' and digital pre-distortion (DPD) receivers' bandwidth requirements.

The device claims to deliver outstanding linearity performance (IIP3 = 25.7dBm and IIP2 = 60dBm at 1.95GHz) and can operate from 700MHz to 3GHz. Unique to this device are two built-in calibration features, said the company. One is advanced circuitry that enables the system designer to optimize the receiver's IIP2 performance, increasing from a nominal 60dBm to 80dBm or higher. The other is on-chip circuitry to null out the DC offset voltages at I and Q outputs. Moreover, the LTC5585 delivers P1dB of 16dBm, added Linear Tech.

The LTC5585 offers very low I/Q amplitude and phase mismatch that is typically 0.05dB, while the phase error is typically 0.7 degree, both measured at 1.95GHz, noted the company. This combination produces a receiver image rejection capability of 43dB.


The LTC5585 can operate from 700MHz to 3GHz.

The I/Q demodulator is engineered for multimode LTE, W-CDMA and TD-SCDMA base stations DPD receivers as well as for main receiver applications. Beyond wireless infrastructure applications, the LTC5585 is ideal for applications in military receivers, broadband communications, point-to-point microwave data links, image reject receivers and long-range RFID readers. It has an on-chip RF transformer to reduce external components, providing a highly compact solution with its 24-lead 4 x 4mm QFN package.

The device is specified for case operating temperature from -40C to 105C and is powered from a single 5V supply, drawing a total supply current of 200mA. The device provides a digital input to enable or disable the chip. When disabled, the IC draws typically 11?A of leakage current. The demodulator's turn-on time of 200ns and turn-off time of 800ns enables it to be used in burst mode receivers. The LTC5585 is priced starting at $5.98 each in 1,000-pieces quantities. Production quantities are now available.

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