Linear Gain Adjustment

This gain control scheme allows establishing the gain according to a continuous linear scale.

Simply set the GainCtl parameter to LIN and maintain all involved GainTrim<1,2,3> parameters to zero.

The gain adjustment uses the Gain parameter and performs as follows:


Gain value	Gain for all camera channels
Gain value	Linear expressions	Logarithmic expressions
700	Nominal gain x 0.70	Nominal gain -3.1 dB
1000	Nominal gain	Nominal gain
1400	Nominal gain x 1.40	Nominal gain +2.9 dB

Once the common gain is chosen for all camera taps (1, 2 or 3), it is still possible to trim an individual tap through the GainTrim<1,2,3> parameter.

The control resolution for GainTrim<1,2,3> is not specified. Each unit increment or decrement correspond to the minimal amount of gain alteration the board hardware is supporting.

Setting the GainTrim<1,2,3> parameter to a positive value increases the gain for the relevant camera tap above the value established by the GainCtl and Gain common parameters. The correction induced by GainTrim<1,2,3> is simply added to the common gain.

Setting the GainTrim<1,2,3> parameter to a negative value decreases the gain for the relevant camera tap below the value established by the GainCtl and Gain common parameters.

The minimal and maximal values for GainTrim<1,2,3> depend on the value assigned to GainCtl and Gain. The limits are in the order of magnitude of ±500.