Can u pls forward me details regardin the above topic

Stepper motors are very well suited for positioning applications and they can achieve very good positional accuracy without complicated feedback loops associated with servo sys- tems. However, when driven in the conventional full or half step modes of operation, is limited by the configuration of the motor. Many designers today seeking alternatives to increase the resolution of the stepper motor drives The most common method for implementing microstepping drives using peak detecting current control and here the sense resistor is connected between the bottom of the bridge and ground.

please read
http://en.wikipediawiki/Stepper_motor
http://ststonline/products/literature/an/8700.pdf
http://ww1.microchipdownloads/en/AppNotes/00822a.pdf
http://knol.googlek/stepper-motor-micros...g-tutorial#