US 4,200,814 A · Multiplier with hall element

Abstract

A multiplier with Hall element is provided with a Hall element with a pair of control current input terminals and a pair of Hall output terminals, means by which current is converted into magnetic field and the converted magnetic field is applied to the Hall element, and at the same time the voltage to be multiplied by the current is converted into control current and the converted control current is fed to control current input terminals, and a differential amplifier circuit including first and second operational amplifiers having non-inverted input terminals connected to the Hall output voltage terminals, and a third operational amplifier having non-inverted and inverted input terminals to which the output of the first and second operational amplifier is applied. The differential amplifier circuit removes the in-phase components of the Hall output voltage and then amplifies it.

Claims16

Dependent claims

A multiplier comprising:

a power-voltage converter including at least one Hall element with a pair of control current input terminals and a pair of Hall output voltage terminals, means for converting input current into magnetic field and applying the magnetic field onto said Hall element and means for converting input voltage to be multiplied by the input current into control current and for feeding the control current to said control current input terminals;
and a differential amplifier circuit in which in-phase components in the output voltage fed from said power-voltage converter are removed and amplified;
wherein said differential amplifier comprises first and second operational amplifiers with non-inverted input terminals connected to said pair of Hall output voltage terminals, respectively, and a third operational amplifier with inverted and non-inverted input terminals connecting to the outputs of said first and second operational amplifiers.

Dependencies are inferred from the claim text.

Multiplier with hall element

Life of this patent

Multiplier with hall element

Life of this patent

Abstract

Claims16