Pulse generator

DETAILED DESCRIPTION OF THE INVENTION Reference will now be made in detail to the presently preferred embodiments of the invention as illustrated in the accompanying drawings, in which like reference numerals designate like or corresponding parts.
The respective embodiments of the present invention will be explained below.
First Embodiment FIG.
1 is a block diagram for illustrating a schematic structure of a pulse generator according to a first embodiment of the present invention.
In other words, in the pulse generator as shown in FIG.
1, a sine wave signal generating circuit 1 generates a sine wave signal "a" as an electric signal of a sine wave having, for example, a frequency fA (a period Ta) in the range from several GHz to 10 GHz as shown in FIG.
2A.
The sine wave signal "a" which is outputted from this sine wave signal generating circuit 1 is inputted in a positive half-wave rectifying circuit 12 and a negative half-wave rectifying circuit 13.
In this case, the positive half-wave rectifying circuit 12 half-wave rectifies only a positive pole in the sine wave signal "a" as shown in FIG.
2A and outputs a positive side rectified signal e as a first pulse train as shown in FIG.
2B.
The positive side rectified signal e which is outputted from this positive half-wave rectifying circuit 12, is applied to one input terminal of a wave synthesizing circuit 15.
On the other hand, the negative half-wave rectifying circuit 13 half-wave rectifies only a negative pole in the sine wave signal "a" as shown in FIG.
2A and outputs a negative side rectified signal g as a second pulse train as shown in FIG.
2C.
The negative side rectified signal g which is outputted from this negative half-wave rectifying circuit 13 is applied to the other input terminal of the wave synthesizing circuit 15 as a delay rectified signal h as shown in FIG.
2D which is delayed by the delay time Th which is designated from the outside by a delay circuit 14.
Accordingly, the delay circuit 14 has a function for setting the phase difference between the first pulse train (the rectified signal in the positive side) and the second pulse train (the rectified signal in the negative side) which are outputted from the positive half-wave rectifying circuit 12