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Product Announcements for QPSK Modulator Block Diagram
Avago Technologies
ACPL-798J Sigma-Delta Modulator

The ACPL-798J is a 1-bit, second-order sigma-delta modulator that oversamples an analog input signal into a high-speed data stream with galvanic isolation based on optical coupling technology. The ACPL-798J operates from a 5V power supply with dynamic range of 82dB with an appropriate digital filter. The differential inputs of ±200mV (full scale ±320mV) are ideal for direct connection to shunt resistors or other low-level signal sources in applications such as motor phase current...

Avago Technologies
Automotive R²Coupler™ Sigma-Delta Modulator

The ACPL-C797T isolated modulator converts a low bandwidth analog input into a high speed 1-bit data stream by means of Sigma-Delta ( Σ- Δ)  over-sampling modulator.   The  modulator data and on-chip sampling  clock are encoded and transmitted across the isolation  barrier where they are recovered and decoded into separate high speed clock and data channels.  Combined with superior optical coupling technology, the modulator delivers high noise margin...

Integrated Device Technology
IDTF1650 Low-Power I/Q Modulator

The  IDTF1650  Broadband  ZIF/CIF  I/Q modulator is ideal for high order  LTEMIMO  systems. The  IDTF1650  I/Q Modulator implements Zero-Distortion ™ technology for extremely low power consumption with ultra high linearity. It features 3 dB of power gain with very low added noise and interfaces directly with popular  JESD204B  and  DDR  DACs. Features. Power Gain = 3.25dB. Direct 100 Ω differential drive from Tx  DAC...