JPH0879019A - Gate pulse generating circuit - Google Patents

Abstract

PURPOSE: To obtain the gate pulse generating circuit with simple circuit configuration, high accuracy in which a pulse width and a phase of an input pulse signal are converted optionally by providing a switch circuit to the circuit to use a pulse conversion circuit of one system partly in duplicate. CONSTITUTION: A switch 2 is provided between an input pulse signal source 1 and a pre-stage one-shot circuit 4, and a switch 3 is provided in parallel with the series circuit comprising the switch 2 and the one-shot circuit 4. In the case of the mode 1, the switch 2 is turned ON and the switch 3 is turned OFF a control signal. The phase of the input pulse signal is delayed by a time (t=x1) by the one-shot circuit 4. The resulting signal is fed to a one-shot circuit 5, in which the pulse width is converted into a width of t=x2, and from which the gate pulse signal whose phase and pulse width are changed is provided as an output. In the case of the mode 2, the switch 2 is turned OFF the switch 3 is turned ON and the input pulse signal is directly fed to the one-shot circuit 5, from which the pulse width is converted into a width of t=x2 and the resulting gate pulse is outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate pulse generation circuit for converting an input pulse signal into a certain pulse width and phase.

[0002]

2. Description of the Related Art Conventionally, as an example of a one-shot circuit for converting an input signal into a constant pulse width, a detection circuit for detecting a signal input, a delay circuit for receiving an output of the detection circuit, and the detection circuit. And a logic circuit having the output of the delay circuit as an input, the output of the delay circuit is used as a reset signal of the detection circuit, and the output of the logic circuit is taken out as an output of a one-shot pulse. There is a one-shot circuit that
8).

Further, when different gate pulse signals are generated in the two modes, a conventional technique in which the phase and the pulse width of the pulse are changed and output on the input pulse signal source side is shown in FIG.
Shown in In FIG. 2, 6 is an input pulse signal source, 9 and 1
Reference numerals 0 and 11 are one-shot circuits, and 7 and 8 are switches controlled by a control signal.

In mode 1, the output signal from the input pulse signal source 6 is input to the one-shot circuit 9 when the switch 7 is turned on and the switch 8 is turned off by the control signal, and t = x1 as shown in FIG. It becomes a pulse signal with a phase delay.
Next, this signal is input to the one-shot circuit 10 and t =
It has a pulse width of x2 and is output as a gate pulse. Next, in the mode 2, the switch 7 is turned off by the control signal.
When the FF and the switch 8 are turned on, the output from the input pulse signal source 6 is input to the one-shot circuit 11, has a pulse width of t = x2 as shown in FIG. 3, and is output as a gate pulse.

In this way, mode 1 and mode 2 are provided on the output side.
When the gate pulse is output, the phase and width of the pulse are changed on the input pulse signal source side according to each mode.

[0006]

However, in the former case, the circuit configuration is complicated, and in the latter case, when it is desired to generate different gate pulse signals in the two modes, the pulse phase on the input pulse signal source side, and It is often difficult or impossible to change the pulse width. or,
To obtain the necessary gate pulse, three one-shot circuits are required as shown in FIG. 2 in order to convert the phase and pulse width of the pulse according to the mode. Therefore, there are problems that the cost and the circuit scale are increased in the circuit design, and the accuracy of the pulse conversion is lowered due to the use of many one-shot circuits in the circuit performance.

The object of the present invention is to solve the problems of the conventional example,
An object of the present invention is to provide a gate pulse generation circuit which has a simple circuit configuration, high accuracy, and can be converted into an arbitrary pulse width and phase.

[0008]

In order to achieve the above object, according to the present invention, there are provided two circuits of a pulse conversion circuit in which two circuits of a one-shot circuit are connected in series and a switch controlled by a control signal according to two modes. Of the switches of the two circuits, one circuit is provided between the input pulse signal source and the preceding one-shot circuit, and the other switch circuit is provided in parallel with the preceding one-shot circuit from the input pulse signal source. It was a pulse generation circuit.

[0009]

With the above-described structure, the present invention operates in the same manner as in the prior art in two different modes, thereby reducing the circuit scale and improving the accuracy of gate pulse generation.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the gate pulse generating circuit shown in the drawings will be described below. 1 is an input pulse signal source, 2,
3 is a switch controlled by a control signal, 4 and 5 are one-shot circuits, which are connected in series between the input pulse signal source 1 and the gate pulse output. The switch 2 is provided between the input pulse signal source 1 and the preceding one-shot circuit 4, and the switch 3 is provided in parallel with the input pulse signal source 1 and the preceding one-shot circuit 4.

The operation of the circuit of the present invention will be described below. In the above configuration, in the mode 1, the switch 2 is turned on and the switch 3 is turned off by the control signal, the input pulse signal is input to the one-shot circuit 4, and the phase delay of t = x1 as shown in FIG. There will be a pulse signal. Next, this signal is input to the one-shot circuit 5, has a pulse width of t = x2, and is output as a gate pulse signal with a changed phase and pulse width. Next, in the mode 2, the switch 2 is turned off and the switch 3 is turned on by the control signal, and the output from the input pulse signal source 1 skips the one-shot circuit 4 and is input to the one-shot circuit 5, as shown in FIG. And has a pulse width of t = x2, and is output as a gate pulse signal.

[0012]

As described above, the gate pulse generation circuit of the present invention does not have two pulse conversion circuits to obtain different gate pulses in two modes, and one pulse conversion circuit is partially multiplexed. Then, the required gate pulse can be output, and there are advantages that the cost can be reduced in circuit design, the circuit scale can be reduced, and the precision of gate pulse creation can be improved in circuit performance.

[Brief description of drawings]

FIG. 1 is a block diagram of a gate pulse generation circuit showing an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional gate pulse generation circuit.

FIG. 3 is a timing chart diagram for obtaining a gate pulse in two modes.

[Explanation of symbols]

 1 Input pulse signal source 2, 3 Switch 4, 5 One shot circuit

Claims (1)

[Claims] 1. A pulse conversion circuit in which two one-shot circuits are connected in series, and two circuits of switches controlled by control signals according to two modes, and one circuit of the switches of the two circuits is provided. Is a gate pulse generation circuit characterized in that it is provided between the input pulse signal source and the one-shot circuit of the preceding stage, and the other switch circuits are provided in parallel with the one-shot circuit of the preceding stage from the input pulse signal source.