EL4083CS INTERSIL [Intersil Corporation], EL4083CS Datasheet - Page 10

• Manufacturer Part Number: EL4083CS
• Description: Current Mode Four Quadrant Multiplier
• Manufacturer: INTERSIL [Intersil Corporation]

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
I
R
R
*1. 51Ω Resistors omitted when using EL2260
*2. Optimum value of RF determined by supplies and amount or tolerable peaking
(-3dB BW ~ 90MHz @ V
Z
X
Y
= V
= V
= V
CC
X
Y
/R
(MAX) / (1.25 × I
(MAX) / (1.25 × I
Z
S
Z
Z
= ±5V, BW ~ 150MHz @ ±15V)
)
)
10
FIGURE 18. BASIC SCHEMATIC (DUAL DIFF OUTS)
EL4083
restrict the output swing to little more than 1V
running into the 500V/µs minimum slew rate of the EL2075.
Table 2 shows the input signal assignments for the
applications listed above.
*X means not connected if function is not used.
Mixer
Frequency Doubler
Modulator
Demodulator
Gain Control/VCA
Multiplier
Squarer
APPLICATION
TABLE 2. INPUT SIGNAL ASSIGNMENTS
FOR FIGURES 18 AND 19 CIRCUITS
Signal 1
Signal
Modulating Signal
Local Oscillator
Gain Control
Signal 1
Signal
V
X
Signal 2
Signal
Carrier
Modulated Signal
Signal
Signal 2
Signal
PP
to avoid
V
Y