EL4094CS Intersil Corporation, EL4094CS Datasheet - Page 10

• Manufacturer Part Number: EL4094CS
• Description: op Amp, 60MHz, Video Gain Controller, 2 Input Fader, With Feedback Resistors For Unity Gain
• Manufacturer: Intersil Corporation

For an adjustable preemphasis filter, for instance, filter A
might be an all-pass filter to compensate for the delay of filter
B, a peaking filter. Fading the gain from A to B provides a
variable amount of peaking, but constant delay.
The EL4094 as a Phase Modulator
To make a phase modulator, filter A might be a leading-
phase network, and filter B a lagging network. The wide
bandwidth of the gain-control input allows wideband phase
modulation of the carrier applied to the main input. Of
course, the carrier and gain inputs must not be digital but be
reasonably clean sinewaves for the modulation to be
accurate.
EL4094 Macromodel
This macromodel is offered to allow simulation of general
EL4094 behavior. We have included these characteristics:
- Small-signal frequency response
- Output loading effects
- Input impedance
- Off-channel feedthrough
- Output impedance over frequency
- Signal path DC distortions
- V
- V
- 100% gain error
GAIN
GAIN
I-V characteristics
overdrive recovery delay
10
FIGURE 4. GENERAL ADJUSTABLE EQUALIZER
EL4094
These will give a good range of results for various operating
conditions, but the macromodel does not behave identically
as the circuit in these areas:
The macromodel’s netlist is based on the Pspice simulator
(copywritten by the Microsim Company). Other simulators
may not support the POLY function, which is used to
implement multiplication as well as square-low
nonlinearities.
- Temperature effects
- Signal overload effects
- Signal and V
- Current-limit
- Video and high-frequency distortions
- Supply voltage effects
- Slewrate limitations
- Noise
- Power supply interactions
G
operating range