Back to results
US 6,608,525 B2Granted
Operational transconductance amplifier and filter circuit
AssigneeFujitsu Limited
InventorYoshihiro Kizaki
Life of this patent
Estimating the term…
Abstract
The operational transconductance amplifier comprises a MOS field-effective transistor that controls the mutual conductance. The central voltage measurement circuit and the voltage addition circuit shift a gate voltage of the MOS field-effective transistor by an amount equal to the deviation of a source voltage of the MOS field-effective transistor caused by an input offset voltage Voff.
Claims3
An operational transconductance amplifier comprising:
- a MOS field-effective transistor having a gate, wherein a resistance of said MOS field-effective transistor changes according to a voltage applied to said gate and transconductance is changed according to the changed resistance;
- a center voltage measurement circuit which measures a center voltage of two input voltages and outputs one of a voltage and a current based on the measured center voltage;
- and
- a voltage addition circuit which supplies said gate of said MOS field-effective transistor with a voltage obtained by adding the voltage or current output from said center voltage measurement circuit to a control voltage or a control current.
1 more element
Dependencies are inferred from the claim text.