Linear Tech I/Q demodulator has 530MHz bandwidth
Linear Technology’s latest wideband direct conversion I/Q demodulator has linearity of 31dBm IIP3 and 70dBm IIP2.
The demodulation bandwidth is over 530MHz, which will allow it to be used in LTE multimode, LTE Advanced receivers, as well as digital predistortion receivers.
The I/Q demodulator operates over a frequency range from 30MHz to 1.4GHz, covering a broad range of VHF and UHF radios and the 450MHz/700MHz LTE frequency bands.
The LTC5584 has built-in calibration features. One allows the designer to optimise the receiver’s IIP2 performance, increasing from a nominal 70dBm to an unprecedented 80dBm or higher.
The other is on-chip circuitry to null out the DC offset voltages at the I and Q outputs. Combined with a 9.9dB noise figure, these features enhance the dynamic range performance in receivers.
The device exacts P1dB of 12.6dBm, along with its 13.6dB noise figure under a 0dBm in-band blocker.
Low I/Q amplitude is typically 0.02dB, while the phase error is typically 0.25 degree, both specified at 450MHz.
This combination produces receiver image rejection of 52dB, said the supplier.