Linear modulator enhances basestation transmitters
A Linear Technology Corp product story
Edited by the Electronicstalk editorial team Oct 16, 2009
A low frequency direct conversion quadrature modulator from Linear offers high linearity performance and low noise to enhance the dynamic range performance of basestation transmitters.
The LTC5598 offers +27.7dBm OIP3 (Output 3rd Order Intercept) and +74dBm OIP2 (Output 2nd Order Intercept) performance.
The LTC5598 integrates two matched, high linearity double-balanced mixers and a broadband precision quadrature phase-shifter with buffered LO.
The device has a noise floor of -160dBm/Hz at a +5dBm output level.
The LTC5598 provides -50.4 dBc image rejection and a carrier leakage of -55dBm.
It consumes 20 per cent less power compared to its closest competitor.
The combination of function and performance enables design of compact, high performance transmitters for wireless infrastructure equipment.
The LTC5598 has dynamic range performance from low frequency to above 1GHz, making it suitable for point-to-point broadband microwave links, 450 and 700MHz LTE basestation transmitters, 800MHz GSM/900MHz EDGE basestation transmitters, 880MHz CDMA2000 basestations, video and cable broadband modulators, multiband military radios, 900MHz multiprotocol RFID readers and satellite transmitters.
It is also capable of operating down to 5MHz, enabling low-frequency applications such as 13.5MHz RFID and contactless readers, telemetry, military communications and medical instrumentation.
The LTC5598 integrates two matched, high linearity double-balanced mixers and a broadband precision quadrature phase-shifter with buffered LO.
The phase shifter maintains an accurate 90deg phase relationship between the I and the Q mixers' LO inputs to provide image rejection over a wide frequency range.
The I and Q input bandwidth of over 400MHz supports virtually all broadband digital transmission requirements.
The mixer outputs are summed into a single-ended, 50Ohm terminated RF output.
The LTC5598 operates from a single 5V supply.
It runs on a quiescent current of 168mA and provides a power-down feature with turn-on and turn-off time of 75 and 10ns, respectively, supporting TDD (Time Division Duplex) type transmitters.
When the chip is disabled with a logic low applied to its enable input pin, the device draws a typical shutdown current of 43uA.
The LTC5598 comes in a 24-lead, 4 x 4mm QFN surface-mount package.
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