The new LTC5569 from Linear Technology is a dual RF mixer that packs a combination of 26,8 dBm IIP3 (input third order intercept), 300 mW per mixer and wide operating frequency coverage to address high density footprints of multimode 4G RRH (remote radio head) MIMO (multiple-input, multiple-output) receivers.
The chip operates over a wide 300 MHz to 4 GHz frequency range, so a single part can be configured to operate on any of the cellular bands from 700 MHz to 2,7 GHz. It exhibits a conversion gain of 2 dB and a noise figure of 11,7 dB. The device has robust inputs that can withstand strong in-band blocking interference signals without significantly degrading its noise figure, thus enhancing receiver sensitivity.
Each channel of the LTC5569 contains an integrated balun transformer at the RF and LO inputs. These ports are single-ended 50 Ω matched, requiring minimal external components. Each channel’s LO has separate buffers driven from a common input, providing excellent channel-to-channel isolation while preserving phase coherency between the two channels.
The LO input port is also single-ended, always 50 Ω matched regardless of whether the mixer is turned on or powered down. Thus, turning on and off the channels will not induce load disturbance, avoiding unlocking of a PLL (phase-locked loop) and VCO circuit. The LO input requires only 0 dBm drive level and has high reverse RF isolation, so it can be driven directly from an external VCO circuit requiring no external buffer.
The LTC5569 operates from a single 3,3 V supply, drawing a total supply current of 180 mA when both channels are on. Each mixer can be independently shut down with a separate enable control. When disabled, the IC draws a maximum of 200 μA leakage current.
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