EL4094 データシートの表示（PDF） - Intersil

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EL4094

Video Gain Control/Fader

Intersil 

EL4094

FIGURE 4. GENERAL ADJUSTABLE EQUALIZER

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

- VGAIN I-V characteristics

- VGAIN overdrive recovery delay

- 100% gain error

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:

- Temperature effects

- Signal overload effects

- Signal and VG operating range

- Current-limit

- Video and high-frequency distortions

- Supply voltage effects

- Slewrate limitations

- Noise

- Power supply interactions

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.

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