Voltage-to-current converter and function generator

Claim 2

A voltage-to-current converter comprising: a. first and second input terminals having first and second input signals applied thereto, b. a voltage-to-current conversion circuit including a first input transistor having its emitter connected to said first input terminal, a first output transistor having its base connected in common with the base of said first input transistor, and a resistor connected between the emitter of said first output transistor and said second input terminal, said voltage-to-current conversion circuit flowing through said first output transistor a current proportional to the voltage difference between the first and second input terminals, the base and collector of said first input transistor being connected with each other, the collector of said first input transistor being connected to a power supply, said first input and output transistors being of one conductivity type, c. a current-to-current conversion circuit including a second input transistor and a second output transistor, the collector Of said first output transistor of said voltage-to-current conversion circuit being connected with the collector of said second input transistor, the base and collector of said second input transistor being connected with each other, the emitters of said second input and output transistors being connected to said power supply, the base of said second input transistor being connected in common with the base of said second output transistor, said second input and output transistors being of a conductivity type opposite to that of said first input and output transistors, said current-to-current conversion circuit supplying through said second output transistor to an output terminal connected to the collector of said second output transistor a current proportional to the current flowing through said first output transistor.

Claim 3

A function generator comprising: a. a common signal input terminal having an input signal applied thereto, b. first and second reference potential input terminals having constant reference voltages of different potential applied thereto, respectively, c. a first voltage-to-current conversion circuit including a first input transistor having its emitter connected to said common signal input terminal, a first output transistor having its base connected in common with the base of said first input transistor, and a first resistor connected between the emitter of said first output transistor and said first reference potential input terminal, said first voltage-to-current conversion circuit flowing a current proportional to the voltage difference between said first reference potential input terminal and said common signal input terminal through said first output transistor, the base and collector of said first input transistor being connected with each other, the collector of said first input transistor being connected to a power supply, said first input and output transistors being of one conductivity type, d. a second voltage-to-current conversion circuit including a second input transistor having its emitter connected to said second reference potential input terminal, a second output transistor having its base connected in common with the base of said second input transistor, and a second resistor connected between the emitter of said second ouput transistor and said common signal input terminal, said second voltage-to-current conversion circuit flowing a second current porportional to the voltage difference between said second reference potential input terminal and said common signal input terminal through said second input transistor, the base and collector of said second input transistor being connected with each other, the collector of said second input transistor being connected to said power supply, said second input and output transistors being of said one conductivity type same as that of said first input and output transistors, e. a current-to-current conversion circuit including a third input transistor and a third output transistor, the collectors of said first and second output transistors of said first and second voltage-to-current conversion circuits being connected with the collector of said third input transistor, the base and collector of said third input transistor being connected with each other, the emitters of said third input and output transistors being connected to said power supply, the base of said third input transistor being connected in common with the base of said third output transistor, said third input and output transistors being of a conductivity type opposite to that of said first input and output transistors, said current-to-current conversion circuit supplying through said third output transistor to an output terminal a third current proportional to said first and second currents flowing through both of said first and second output transistors, and f. a current-to-voltage conversion circuit comprising third and fourth resistors connected to the collector of said third output transistor of said cuRrent-to-current conversion circuit for producing a voltage proportional to said third current of said current-to-current conversion circuit.

Claim 4

A function generator comprising: a. a common signal input terminal having an input signal applied thereto, b. first and second reference potential input terminals having constant reference voltages of different potential applied thereto, respectively, c. a first voltage-to-current conversion circuit including a first input transistor having its emitter connected to said common signal input terminal, a first output transistor having its base connected in common with the base of said first input transistor, and a first resistor connected between the emitter of said first output transistor and said first reference potential input terminal, said first voltage-to-current conversion circuit flowing a current proportional to the voltage difference between said first reference potential input terminal and said common signal input terminal through said first output transistor, the base and collector of said first input transistor being connected with each other, the collector of said first input transistor being connected to a power supply, said first input and output transistors being of one conductivity type, d. a second voltage-to-current conversion circuit including a second input transistor having its emitter connected to said second reference potential input terminal, a second output transistor having its base connected in common with the base of said second input transistor, and a second resistor connected between the emitter of said second ouput transistor and said common signal input terminal, said second voltage-to-current conversion circuit flowing a second current porportional to the voltage difference between said second reference potential input terminal and said common signal input terminal through said second input transistor, the base and collector of said second input transistor being connected with each other, the collector of said second input transistor being connected to said power supply, said second input and output transistors being of said one conductivity type same as that of said first input and output transistors, e. a current-to-current conversion circuit including a third input transistor and a third output transistor, the collectors of said first and second output transistors of said first and second voltage-to-current conversion circuits being connected with the collector of said third input transistor, the base and collector of said third input transistor being connected with each other, the emitters of said third input and output transistors being connected to said power supply, the base of said third input transistor being connected in common with the base of said third output transistor, said third input and output transistors being of a conductivity type opposite to that of said first input and output transistors, said current-to-current conversion circuit supplying through said third output transistor to an output terminal a third current proportional to said first and second currents flowing through both of said first and second output transistors, and f. a current-to-voltage conversion circuit comprising third and fourth resistors connected to the collector of said third output transistor of said cuRrent-to-current conversion circuit for producing a voltage proportional to said third current of said current-to-current conversion circuit.

Claim 5

A function generator comprising: a. an input terminal having an input signal applied thereto, b. a plurality of reference potential input terminals having a plurality of constant reference voltages of different potential applied thereto, respectively, c. a voltage-to-current conversion circuit including a first input transistor of one conductivity type having its emitter connected to said input terminal, an output multi-emitter transistor with a plurality of emitters and having its base connected in common with the base of said first input transistor, and a plurality of resistors each connected between respective ones of the emitters of said output multi-emitter transistor and respective ones of said reference potential input terminals, said voltage-to-current conversion circuit flowing currents each proportional to the voltage difference between respective ones of said reference potential input terminals and said input terminal through respective ones of the emitters of said output multi-emitter transistor, the base and collector of said first input transistor being connected with each other, the collector of said first input transistor being connected to a power supply, said output multi-emitter transistor being of said one conductivity type same as that of said first input transistor, d. a current-to-current conversion circuit including a second input transistor having its collector connected to the collector of said output multi-emitter transistor of said voltage-to-current conversion circuit, and a second output transistor having its base connected with the base of said second input transistor, said current-to-current conversion circuit supplying to an output terminal an output current proportional to said currents flowing through said output multi-emitter transistor, the base and collector of said second input transistor being connected with each other, both emitters of said second input and output transistors being connected to said power supply, said second input and output transistors being of a conductivity type opposite to that of said first input and output transistors, e. a current-to-voltage conversion circuit connected to the collector of said second output transistor of said current-to-current conversion circuit for producing a voltage at said output terminal proportional to said output current of said current-to-current conversion circuit.

Claim 6

A function generator comprising: a. an input terminal having an input signal applied thereto, b. a plurality of reference potential input terminals having a plurality of constant reference voltages of different potential applied thereto, respectively, c. a voltage-to-current conversion circuit including a first input transistor of one conductivity type having its emitter connected to said input terminal, an output multi-emitter transistor with a plurality of emitters and having its base connected in common with the base of said first input transistor, and a plurality of resistors each connected between respective ones of the emitters of said output multi-emitter transistor and respective ones of said reference potential input terminals, said voltage-to-current conversion circuit flowing currents each proportional to the voltage difference between respective ones of said reference potential input terminals and said input terminal through respective ones of the emitters of said output multi-emitter transistor, the base and collector of said first input transistor being connected with each other, the collector of said first input transistor being connected to a power supply, said output multi-emitter transistor being of said one conductivity type same as that of said first input transistor, d. a current-to-current conversion circuit including a second input transistor having its collector connected to the collector of said output multi-emitter transistor of said voltage-to-current conversion circuit, and a second output transistor having its base connected with the base of said second input transistor, said current-to-current conversion circuit supplying to an output terminal an output current proportional to said currents flowing through said output multi-emitter transistor, the base and collector of said second input transistor being connected with each other, both emitters of said second input and output transistors being connected to said power supply, said second input and output transistors being of a conductivity type opposite to that of said first input and output transistors, e. a current-to-voltage conversion circuit connected to the collector of said second output transistor of said current-to-current conversion circuit for producing a voltage at said output terminal proportional to said output current of said current-to-current conversion circuit.