Monolithic horizontal processing circuit with selectable duty cycle

Claim 2

An electronic switch circuit for providing an output oscillatory signal of subtantially square wave configuration in response to an oscillatory signal of essentially sawtooth configuration and wherein the duty cycle of the square wave may be preset to a desired ratio, the electronic switch circuit including in combination: first circuit means for selectively controlling the setting of a switching threshold of the electronic switch circuit and providing a reference voltage at an output terminal thereof; a first transistor of a first conductivity type having a control electrode adapted to receive the sawtooth signal and an output electrode; and a second transistor of a second conductivity type having a first control electrode connected to said output electrode of said first transistor, a second control electrode connected to said output terminal of said first circuit means and adapted to receive said reference voltage, and an output electrode, said second transistor being rendered conductive and nonconductive as the voltage excursion of said sawtooth signal swings above and below said reference voltage to provide the output oscillatory signal of substantially square wave configuration, said reference voltage controlling the ratio of the duty cycle.

Claim 3

The electronic switch circuit of claim 1 further including second circuit means having a pair of interconnected third and fourth transistors of said first conductivity type connected to said output electrode of said second transistor.

Claim 4

The electronic switch circuit of claim 1 wherein: said first circuit means includes a voltage divider means having first and second resistive means connected in series and having a node therebetween; and means connecting said second control electrode of said second transistor to said node.

Claim 5

An electronic switch circuit including in combination: first switch means having a controllable switching threshold and including a first transistor having a first conductivity type, said first transistor being interconnected with a second transistor, said second transistor having a second conductivity type and a control electrode; second switch means having a pair of interconnected third and fourth transistors both of said first conductivity type; circuit means connecting said first switch means to said second switch means; and resistive voltage-divider means having a terminal connected to said control electrode of said second transistor, said resistive voltage-divider means establishing a reference potential at said control electrode of said second transistor which determines the switching threshold of said first switch means.

Claim 6

An electronic switch circuit including in combination: first switch means having a controllable switching threshold and including a first transistor having a first conductivity type, said first transistor being interconnected with a second transistor, said second transistor having a second conductivity type and a control electrode; second switch means having a pair of interconnected third and fourth transistors both of said first conductivity type; circuit means connecting said first switch means to said second switch means; and resistive voltage-divider means having a terminal connected to said control electrode of said second transistor, said resistive voltage-divider means establishing a reference potential at said control electrode of said second transistor which determines the switching threshold of said first switch means.

Claim 7

The electronic switch circuit of claim 4 wherein: all of said transistors are bipolar transistors each having emitter, base and collector electrodes, said base electrode of said first transistor forming an input terminal for the electronic switch circuit, said emitter electrode of said first transistor being connected to said base electrode of said second transistor and said collector electrode of said first transistor being connected to a first power supply terminal; first resistive means connecting said emitter electrode of said first transistor and said base electrode of said second transistor to a second power supply terminal; said collector electrode of said second transistor being connected to said base electrode of said third transistor; second resistive means connecting said base electrode of said third transistor and said collector electrode of said second transistor to said second power supply terminal, said emitter electrode of said second transistor being connected to said resistive voltage divider means; said collector electrode of said third transistor being connected to said base electrode of said fourth transistor; third resistive means connecting said collector electrode of said third transistor and said base electrode of said fourth transistor to said collector electrode of said first transistor; said emitter electrodes of said third and fourth transistors being connected to said second power supply terminal; and said collector electrode of said fourth transistor being connected to the output terminal of the electronic switch circuit.

Claim 8

The electronic switch circuit of claim 5 further including fourth resistive means connecting said collector electrode of said fourth transistor to said first power supply terminal.

Claim 9

A circuit suitable for providing a recurring output signal of substantially square wave configuration of a predetermined duty cycle at an output terminal in response to a recurring input signal applied to an input terminal thereof, including in combination: a first electrical power conductor; a second electrical power conductor; first transistor means having first, second and third electrodes, said third electrode thereof being coupled with said first electrical power conductor; input signal conductive means connecting the input terminal of the circuit to said second electrode of said first transistor means for applying the recurring input signal thereto; second transistor means having first, second and third electrodes, the second electrode thereof being coupled with said first electrode of said first transistor means; first resistive means coupling said first electrode of said first transistor means and said second electrode of said second transistor means with said second electrical power conductor; reference potential conductor means coupled with said first electrode of said second transistor means for applying a reference potential thereto to determine the duty cycle of the output signal; third transistor means having first, second and third electrodes, said first electrode being coupled to said second electrical power conductor, said second electrode being coupled to said third electrode of said second transistor means, and said third electrode being coupled to said first electrical power conductor; and fourth transistor means having first, second and third electrodes, said first electrode being connected to said second electrical power conductor, said second electrode being connected to said third electrode of said third transistor means, and said third electrode being connected to the output terminal of the circuit.

Claim 10

A circuit suitable for providing a recurring output signal of substantially square wave configuration of a predetermined duty cycle at an output terminal in response to a recurring input signal applied to an input terminal thereof, including in combination: a first electrical power conductor; a second electrical power conductor; first transistor means having first, second and third electrodes, said third electrode thereof being coupled with said first electrical power conductor; input signal conductive means connecting the input terminal of the circuit to said second electrode of said first transistor means for applying the recurring input signal thereto; second transistor means having first, second and third electrodes, the second electrode thereof being coupled with said first electrode of said first transistor means; first resistive means coupling said first electrode of said first transistor means and said second electrode of said second transistor means with said second electrical power conductor; reference potential conductor means coupled with said first electrode of said second transistor means for applying a reference potential thereto to determine the duty cycle of the output signal; third transistor means having first, second and third electrodes, said first electrode being coupled to said second electrical power conductor, said second electrode being coupled to said third electrode of said second transistor means, and said third electrode being coupled to said first electrical power conductor; and fourth transistor means having first, second and third electrodes, said first electrode being connected to said second electrical power conductor, said second electrode being connected to said third electrode of said third transistor means, and said third electrode being connected to the output terminal of the circuit.

Claim 11

The circuit of claim 7 wherein: said first, third and fourth transistor means respectively has a first, third and fourth bipolar transistor of a first conductivity type and said second transistor means has a second bipolar transistor of a second conductivity type; each of said bipolar transistors having emitter, base and collector electrodes, said base electrode of said first bipolar transistor forming an input terminal for the circuit, said emitter electrode of said first bipolar transistor being connected to said base electrode of said second bipolar transistor and said collector electrode of said first bipolar transistor being connected to said first electrical power conductor; said first resistive means connecting said emitter electrode of said first bipolar transistor and said base electrode of said second bipolar transistor to said second electrical power conductor; first conductive means connecting said collector electrode of said second bipolar transistor to said base electrode of said third bipolar transistor; second resistive means connecting said base electrode of said third bipolar transistor and said collector electrode of said second bipolar transistor to said second power supply conductor; second conductive means connecting said emitter electrode of said second bipolar transistor to said reference potential means; third conductive means connecting said collector electrode of said third bipolar transistor to said base electrode of said fourth bipolar transistor; third resistive means connecting said collector electrode of said third bipolar transistor and said base electrode of said fourth bipolar transistor to said collector electrode of said first bipolar transistor; fourth conductive means connecting said emitter electrodes of said third and fourth bipolar transistors to said second electrical power conductor; and said collector electrode of said fourth bipolar transistor being connected to the output terminal of the circuit.

Claim 12

The circuit of claim 8 further including a fourth resistive means coupling said collector electrode of said fourth bipolar transistor to a first power supply.

Claim 13

The circuit of claim 9 further including a resistive voltage divider means comprised of discrete components, said voltage divider means being connected to said reference potential means and providing said reference potential.