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Date: 09-11-13

Ultra-low-noise LDO for powering RF circuit

When your RF design is extremely sensitive to power supply noise, you naturally prefer low dropout linear voltage regulator instead of switching regulator. But even sometimes most of the linear voltage regulators may not satisfy your noise requirements, in that case check this ultra low noise LDO from Analog Devices. The ultra-low-noise LDO ADM7150/1 operate from 4.5 V to 16 V, provide up to 800-mA of output current and support output voltages from 1.5 to 5.0 V. The LDOs achieve an output-NSD (noise spectral density) of 1.4 nV/rtHz from 10 kHz to 1 MHz, which significantly reduces VCO (voltage-controlled oscillator) phase noise in point-to-point microwave radios, satellite communications, defense electronics and other wideband applications. A user adjustable CBYP is also featured in this LDO to reduce low frequency 1/f noise (8 nV/rtHz at 100 Hz) for precision analog front-end measurement systems.

ADM7150/1 achieve line and load transient responses of 0.01%/V and 0.4%/A respectively with a 10-µF ceramic output capacitor. The new LDOs also feature high PSRR (power-supply rejection ratio) performance of greater than 90 dB from 1 kHz to 100 kHz, and greater than 60 dB at 1 MHz. This effectively filters DC-DC switching regulator ripple, saving space by minimizing the size of discrete filtering components normally needed.

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