High-speed differential amplifier

21 January 2009 Analogue, Mixed Signal, LSI

Analog Devices recently introduced a high-speed differential amplifier that delivers a combination of high performance, low noise and reduced power consumption for engineers driving high-gain ADCs (analog-to-digital converters) in power-sensitive communications and instrumentation systems. Drawing very little current, the ADA4927 achieves greater than 80 dB SFDR (spurious-free dynamic range) at a gain of 10. Even at such high gain, the device’s current feedback architecture allows it to maintain performance over an input bandwidth range of DC to more than 100 MHz.

The device can be used in single-ended-to-differential and differential-to-differential configurations and is optimised for driving high-performance 14- and 16-bit converters. It is especially well suited to wireless communications applications as well as medical equipment and defence electronics that use low IF (intermediate frequency) and baseband signal processing at frequencies up to 100 MHz, and where 14- and 16-bit accuracy is required. The two-channel version, the ADA4927-2, is suitable for driving dual ADCs used in I/Q demodulation schemes and offers low cross-talk of -80 dB at 100 MHz while providing gain and phase matching.

The internal common-mode feedback loop of the ADA4927 allows the user to independently adjust the output common-mode level to match the input common-mode voltage of the ADC, while achieving good output balance and suppression of even-order harmonics.

The device achieves low levels of distortion with an input voltage noise of 2,3 nV/rt Hz, as well as -3 dB bandwidth of 1,4 GHz and a slew rate of 5000 V/μs. Consuming less than 120 mW from a single 3,3 V supply, it is specified to operate over the -40°C to +105°C temperature range for both 3,3 V and 5 V operation.

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