Device for producing two clock pulse trains from a periodic signal of any waveform
AssigneeSiemens Aktiengesellschaft
InventorHelmut Roesler
Life of this patent
Estimating the term…
Abstract
A device for producing two clock pulse trains from a periodic signal comprised of waveforms of any shape produces digital pulses having the same period and further having respective duty cycles which are separated by pauses when the pulse series are aligned. The device consists two flip flop cells and two push-pull transistor outputs respectively connected thereto, each push-pull output having an output tap between the transistors. One flip flop cell is connected directly to a waveform source, and the other flip flop cell is connected to the waveform source via a transistor follower circuit.
Claims14
A pulse transformer with two signal outputs at which different digital pulses with the same period appear for producing a clock supply to digital semiconductor circuits, for use with a control input source which supplies periodic control signals to a transformer input, said transformer comprising:
- a first flip-flop cell having inverted and non-inverted signal inputs connected to said control input source and having two signal outputs;
- a voltage level divider having an input connected to said control input source and having an output tap;
- a second flip-flop cell having inverted and non-inverted inputs connected to said output of said voltage level divider, and having two signal outputs;
- a first push-pull output circuit having two inputs respectively connected to said two signal outputs of said first flip-flop cell;
- a second push-pull output circuit having two inputs respectively connected to said two signal outputs of said second flip-flop cell;
- said first and second push-pull output circuits each comprising two series connected transistors, one of said transistors connected to a reference potential and the other of which is connected to an operating potential, and each push-pull output circuit further having one circuit point lying between the two transistors comprising the circuit, said circuit points forming said two transformer signal outputs;
- and
- said operating potential also serving as a current supply for said first and second flip-flop cells, and said reference potential also serving as a reference potential also serving as a reference potential for said voltage level divider and said first and second flip-flop cells.
A monolithic integrated circuit for producing two periodic pulse trains of the same frequency having respective duty cycles of differing duration such that when aligned said duty cycles are separated by non-duty cycle intervals, said circuit for use with a control signal input for supplying periodic waveforms of any shape to said circuit, said circuit comprising:
- a first flip-flop cell of the reset type, said first flip-flop cell having inverting and non-inverting inputs connected to said control signal input, and having a first output having a logical state after a change of state corresponding to the logical state which initiates the change of state, and a second output;
- a voltage divider comprised of a first transistor having a controlled input connected to said control signal input and a first electrode connected through a series resistor to a reference potential and a second electrode connected to an operating potential, and an output tap between said first electrode and said series resistor;
- a second flip-flop cell of the reset type having inverting and non-inverting inputs connected to said voltage divider output, said second flip-flop cell having a first output having a logical state after a change of state corresponding to the logical state which initiates the change of state, and a second output;
- a first push-pull output circuit comprised of second and third series connected transistors of the same type, each transistor having a controlled input electrode and first and second electrodes, the second transistor having its first electrode connected to the reference potential and the third transistor having its second electrode connected to the operating potential, with the remaining second and first electrodes connected to each other with an output tap taken at a point between said transistors, the controlled input electrodes of the second and third transistors connected to the respective second and first outputs of said first flip-flop cell;
- and
- a second push-pull output circuit comprised of fourth and fifth series connected transistors of the same type, each transistor having a controlled input electrode and first and second electrodes and the fourth transistor having its first electrode connected to the reference potential and the fifth transistor having its second electrode connected to the operating potential, with the remaining second and first electrodes connected to each other with an output tap taken at a point between said transistors, with the controlled input of the fourth and fifth transistors connected to the respective first and second outputs of said second flip-flop cell.
Dependencies are inferred from the claim text.