Relaxation Voltage (V
RLX
)
After programming, an EPAD threshold voltage will “ relax “ a small amount, which corresponds to a small loss of interface
charge. This is a small, fixed voltage step and decreases at a Relaxation Time Constant. The Relaxation Voltage is the
voltage change (voltage drop) after three Relaxation Time Constants. To compensate for this, an initial relaxation voltage,
expressed as a percentage of the programmed Vt, can be added to the initial desired target voltage.
Tempco of Differential Threshold Voltage (TCDV )
t
Temperature Coefficient of Differential Threshold Voltage is the change in difference between two EPAD threshold
voltages per degree C change in temperature when the two devices initially have 1V relative electrically programmed
Vt difference.
Tempco of Threshold Voltage (TCV )
t
Temperature Coefficient of the Vt is the change in the Threshold Voltage per degree C change in temperature.
Threshold Voltage (V )
t
Threshold Voltage of an EPAD is the voltage across Gate and Source when 1µA is forced into the Drain terminal as the
Drain and Gate are connected together.
Tempco of V
OS
(TCV )
OS
Temperature Coefficient of Offset Voltage is the change in difference between two EPAD threshold voltages per degree
Centigrade change in temperature when the two devices have the same initial electrically programmed Vt values.
Zero Tempco Current (I
)
ZTC
The Drain current of an EPAD device at which Temperature Coefficient of the Drain-Gate Connected Voltage, relative to
the Source Voltage, is at zero.
ALD1108E/ALD1110E
Advanced Linear Devices
10
ALD [ ADVANCED LINEAR DEVICES ]
