AD8333:  DC to 50 MHz, Dual I/Q Demodulator and Phase Shifter

The AD8333 is a dual-phase shifter and I/Q demodulator that enables coherent summing and phase alignment of multiple analog data channels. It is the first solid-state device suitable for beamformer ...More

AD8333:  DC to 50 MHz, Dual I/Q Demodulator and Phase Shifter

Product Description

The AD8333 is a dual-phase shifter and I/Q demodulator that enables coherent summing and phase alignment of multiple analog data channels. It is the first solid-state device suitable for beamformer circuits, such as those used in high performance medical ultrasound equipment featuring CW Doppler. The RF inputs interface directly with the outputs of the dual-channel, low noise preamplifiers included in the AD8332.

A divide-by-4 circuit generates the internal 0° and 90° phases of the local oscillator (LO) that drive the mixers of a pair of matched I/Q demodulators.

The AD8333 can be applied as a major element in analog beamformer circuits in medical ultrasound equipment.

The AD8333 features an asynchronous reset pin. When used in arrays, the reset pin sets all the LO dividers in the same state. Sixteen discrete phase rotations in 22.5° increments can be selected independently for each channel. For example, if Channel 1 is used as a reference and the RF signal applied to Channel 2 has an I/Q phase lead of 45°, Channel 2 can be phase aligned with Channel 1 by choosing the correct code.

Phase shift is defined by the output of one channel relative to another. For example, if the code of Channel 1 is adjusted to 0000 and that of Channel 2 to 0001 and the same signal is applied to both RF inputs, the output of Channel 2 leads that of Channel 1 by 22.5°.

The I and Q outputs are provided as currents to facilitate summation. The summed current outputs are converted to voltages by a high dynamic-range, current-to-voltage (I-V) converter, such as the AD8021, configured as a transimpedance amplifier. The resultant signal is then applied to a high resolution ADC, such as the AD7665 (16 bit/570 kSPS).

The two I/Q demodulators can be used independently in other nonbeamforming applications. In that case, a transimpedance amplifier is needed for each of the I and Q outputs, four in total for the dual I/Q demodulator.

The dynamic range is 159 dB/Hz at each I and Q output, but the following transimpedance amplifier is an important element in maintaining the overall dynamic range, and attention needs to be paid to optimal component selection and design.

The AD8333 is available in a 32-lead LFCSP (5 mm × 5 mm) package for the industrial temperature range of −40°C to +85°C.

Applications

  • Medical imaging (CW ultrasound beamforming)
  • Phased array systems (radar and adaptive antennas)
  • Communication receivers

    • Data Sheet, Rev. B, 5/07

    Features

    • Dual integrated I/Q demodulator
    • 16 phase select on each output (22.5° per step)
    • Quadrature demodulation accuracy
      Phase accuracy: ±0.1°
      Amplitude balance: ±0.05 dB
    • Bandwidth
      4 LO: 100 kHz to 200 MHz
      RF: dc to 50 MHz
      Baseband: determined by external filtering
    • Output dynamic range: 159 dB/Hz
    • LO drive > 0 dBm (50 Ω); 4 LO > 1 MHz
    • Supply: ±5 V
    • Power consumption: 190 mW/channel (380 mW total)
    • Power down

    Diagrams

    AD8333 Diagram
    Functional Block Diagram for AD8333

    Specifications

    Function Demod
    RF Freq (MHz) dc to 50
    Phase Error (deg) 0.1Deg
    Amplitude Error (dB) 0.05dB
    NF 9dB
    Noise Floor (dBm/Hz) -161
    Voltage Supply (V) +/- 5
    Supply Current (max) 44mA
    Package 32-Lead LFCSP

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