Using diodes and current sources(cam be substituted with mos) a voltage limitter can be created, its value can be ajusted by i value(current sources must have an equal value). Vout=vin when vin<|+-10|, when vin> 10 vout =10 because of current sources and diode characteristics. This value can be also altered by changing Is of the diode. It is standart in 0.7 vd at 1mA.
