Ultra-Low-Noise RF Low-Dropout Regulators Reduce Phase Noise in Wideband Communication Systems

• Reduces LDO noise spectral density by a factor of two
• Provides lowest phase noise for powering VCOs; lowest jitter performance for powering clock devices in microwave systems

Analog Devices announced the release of ultra-low-noise LDO (low-dropout) regulators for RF (radio frequency) signal devices. The 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/√Hz 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. Additionally, a user adjustable CBYP can significantly reduce low frequency 1/f noise (8 nV/√Hz at 100 Hz) for precision analog front-end measurement systems.

In addition to ultra-low noise, the 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.

Pricing and Availability

analog.com