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Analog Multiplier - Variable Transconductance Technique | Linear Integrated Circuits : Analog Multiplier and PLL

Chapter: Linear Integrated Circuits : Analog Multiplier and PLL

Variable Transconductance Technique

The variable transconductance technique makes use of the dependence characteristic of the transistor transconductance parameter on the emitter current bias applied.

Variable Transconductance Technique:



·           The variable transconductance technique makes use of the dependence characteristic of the transistor transconductance parameter on the emitter current bias applied. A simple differential circuit arrangement depicting the principle is shown in figure.

 

·           The relationship between V0 and Vx . is given by V0 = gm RL VX where gm = IEE /VT is the transconductance of the stage.

 

·           Application of a second input Vy to the reference current source of the differential amplifier can vary gm.

 

·           Thus, if RE IEE >>VBE, the bias voltage Vy is related to IEE by the relation Vy = IEE RE.

 

·           Then, the overall voltage transfer expression is given by

 

V0 = gm RLVx = (Vy/VTRE)VxRL

= VxVy  RL/ VTRE


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Linear Integrated Circuits : Analog Multiplier and PLL : Variable Transconductance Technique | Analog Multiplier


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