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File Last modified on: Tue Jan 15, 2013 10:45:02
 

A biasing circuit for a PMOSFET resistor for compensating process, voltage and temperature (PVT) variations affecting the resistance of the PMOSFET resistor

 

A biasing circuit for a PMOSFET resistor for compensating process, voltage and temperature (PYT) variations affecting the resistance of the PMOSFET resistor comprising a pair of series connected first (1) and second (2) PMOSFETs. Gates (3 & 4) of both (1 & 2) the PMOSFETS are connected to a drain (5) of the second PMOSFET (2). Source (6) of the first PMOSFET (1) is tied to a voltage supply source, drain (7) of a third PMOSFET (9) is connected to the drain (5) of the second PMOSFET (2) and source (8) of the third PMOSFET (9) is grounded. The third PMOSFET (9) is biased appropriately at a gate (10) thereof. The output of the biasing circuit is taken at the drain (11) of the first PMOSFET (1) and fed to a gate of the PMOSFET resistor. (Fig 1)

Indian patent application no. 1198/MUM/2012
Inventors: Maryam Shojaei Baghini, Anvesha A