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A new high performance quadrature modulator from Linear Technology is optimized for 850 to 965 MHz GSM, CDMA2000, ISM, and RFID modulator applications. The LT5568 accepts I (In phase) and Q (Quadrature phase) baseband signals and modulates directly to the RF transmission frequency. Its Zero-IF transmitter architecture enables basestation designers to attain high performance while reducing parts count and shrinking size. The product features desirable linearity with an OIP3 (Output 3rd Order Intercept Point) of 22.9 dBm and an OIP2 (Output 2nd Order Intercept Point) of 63 dBm at 850 MHz. The LT5568’s noise floor is – 160.3 dBm/Hz, and its image rejection is – 46 dBc with an LO leakage of – 43 dBm. This device meets or exceeds the range requirements of GSM cellular basestations as well as other high performance wireless infrastructure transmitters. The LT5568 is an integrated chip comprising two matched, high linearity mixers, a precision 0° and 90° phase shifter, a 50Ω LO input buffer, 50Ω I and Q inputs, and an on-chip RF transformer with an output matched to 50Ω within the band of 700 to 1050 MHz.

Linear Technology