Current Mode Four Quadrant Multiplier

The EL4083 makes use of an Elantec fully complimentary oxide isolated bipolar process to produce a patent pending current in, current out four quadrant multiplier. Input and output signal summing and direct interface to other current mode devices can be accomplished by simple

connection to reduce component count and preserve bandwidth. The selection of an appropriate series resistor value allows an input to accept a voltage signal of any size and optimize dynamic range. The differential outputs offer significant performance improvements which greatly extend

the usable gain control range at high frequencies. The bias current is programmable to accommodate the voltage and power dissipation constraints of the package and available

systems supplies.

Features

• Novel current mode design

    - Virtual ground current summing inputs

    - Differential ground referenced current outputs

• High speed (both inputs)

    - 200MHz bandwidth

    - 12ns 1% settling time

• Low distortion

    - THD < 0.03% @ 1MHz

    - THD < 0.1% @ 10MHz

• Low noise (RL= 50Ω)

    - 100dB dynamic range

    - 10Hz to 20kHz

    - 73dB dynamic range

    - 10Hz to 10MHz

• Wide supply conditions

    - ±5 to ±15V operation

    - Programmable bias current

• 0.2dB gain tolerance to 25MHz

Applications

• Four quadrant multiplication

• Gain control

• Controlled signal summing and multiplexing

• HDTV video fading and switching

• Mixing/modulating/demodulating (phase detection)

• Frequency doubling

• Division

• Squaring

• Square rooting

• RMS and power measurement

• Vector addition-RMS summing

• CRT focus and geometry correction

• Polynomial function generation

• AGC circuits