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EL4083CN

Current Mode Four Quadrant Multiplier

Intersil 

EL4083

Applications

Basic Product Functions

Figures 18 and 19 are the basic schematics for many of the

applications of the EL4083. These can perform signal

mixing, frequency doubling, modulation, demodulation, gain

control/voltage-controlled amplification, multiplication and

squaring. Figure 18 has resistively terminated differential

outputs and has the widest bandwidth. The figure also

shows the option of using the EL2260 dual CMF amplifier to

recover the outputs differentially at very low impedance.

This has a maximum 3dB bandwidth of 130MHz and settles

to 1% in 25ns. Figure 19 uses an EL2075 at the outputs as a

differential to single ended converter with gain to take

advantage of the performance enhancements of the

differentially recovered output mentioned above and to

provide a high level low impedance drive. The -3dB

bandwidth of this circuit is over 150MHz using good layout

techniques. However, to achieve this bandwidth one must

restrict the output swing to little more than 1VPP to avoid

running into the 500V/µs minimum slew rate of the EL2075.

Table 2 shows the input signal assignments for the

applications listed above.

TABLE 2. INPUT SIGNAL ASSIGNMENTS

FOR FIGURES 18 AND 19 CIRCUITS

APPLICATION

Mixer

VX

Signal 1

VY

Signal 2

Frequency Doubler Signal

Signal

Modulator

Modulating Signal

Carrier

Demodulator

Local Oscillator

Modulated Signal

Gain Control/VCA Gain Control

Signal

Multiplier

Signal 1

Signal 2

Squarer

Signal

Signal

*X means not connected if function is not used.

IZ = VCC/RZ

RX = VX (MAX) / (1.25 × IZ)

RY = VY (MAX) / (1.25 × IZ)

*1. 51Ω Resistors omitted when using EL2260

*2. Optimum value of RF determined by supplies and amount or tolerable peaking

(-3dB BW ~ 90MHz @ VS = ±5V, BW ~ 150MHz @ ±15V)

FIGURE 18. BASIC SCHEMATIC (DUAL DIFF OUTS)

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