This paper describes a novel input-free MOS V-T extractor circuit. The
circuit consists of a bias voltage block and a novel V-T extractor bl
ock. The proposed V-T extractor block has the advantages of the ground
-referenced output, low influences of the nonideality, few numbers of
transistors and no influence of the PMOS process. The PSpice simulatio
ns show the supply voltage range and the bias voltage range of the pro
posed circuit are wider than those of Johnson's or Wang's.