Pulse generator for fast rise-time pulses

Claim 2

A pulse generator for producing unidirectional pulses comprising: pulse generation means having on output conductor, a transfer impedance circuit transmissible of a dc current and having an input conductor and an output conductor, said input conductor being connected to the output of the pulse generation means, said transfer impedance including first and second series connected resistors having respective first leads connected together and respective second leads coupled respectively to said input and output conductors, and including a series connected combination of capacitor and a third resistor, said series connected combination being connected in parallel with one of said first and second resistors, a step recovery diode one electrode of which is grounded and the other electrode of which is connected to the output conductor of the transfer impedance circuit, a switching diode one electrode of which is connected to the output conductor of the transfer impedance circuit and another electrode of which is connected directly to a pulse generator output terminal, means for causing a forward dc current to flow through the step recovery diode in the absence of a pulse from the pulse generation means, whereby output pulses each having an extremely short rise time can be obtained at the output terminal as a result of the nonconduction and conduction, respectively, of the step recovery diode and the switching diode output pulse of the pulse generation means.

Claim 3

A pulse generator according to claim 1 further comprising an auxiliary switching diode having one electrode connected to the other electrode of the step recovery diode, said auxiliary switching diode having another electrode, and a dc source means for applying a dc voltage less than the inverse breakdown voltage of the step recovery diode to said other switching diode electrode.

Claim 4

A pulse generator according to claim 1, further comprising distributed constant circuit means inSerted between the transfer impedance circuit and the said other electrode of the step recovery diode to improve the wave form of the output pulses.

Claim 5

A pulse generator according to claim 3, further comprising an auxiliary switching diode having one electrode connected to said other electrode of the step recovery diode, said auxiliary switching diode having another electrode, and a dc source for applying a dc voltage less than the inverse breakdown voltage of the step recovery diode to said other switching diode electrode.

Claim 6

A pulse generator having an output terminal for producing uni-directional pulses comprising: pulse generation means having an output conductor, transfer impedance circuit means transmissible of a dc current and having an input conductor and an output conductor, said input conductor being connected to the output of the pulse generation means for shaping the form of pulses produced by said pulse generation means, and for protecting said pulse generation means against excessive loads, a step recovery diode one electrode of which is grounded and the other electrode of which is connected to the output conductor of the transfer impedance circuit means, a switching diode one electrode of which is connected to the output conductor of the transfer impedance circuit means and another electrode of which is connected directly to said pulse generator output terminal, means for causing a forward dc current to flow through the step recovery diode in the absence of a pulse from the pulse generation means, distributed constant circuit means inserted between the transfer impedance circuit means and the said other electrode of the step recovery diode to improve the wave form of the output pulses, and an auxiliary switching diode having one electrode connected to the other electrode of the step recovery diode, said auxiliary switching diode having another electrode, and a dc source means for applying a dc voltage less than the inverse breakdown voltage of the step recovery diode to said other switching diode electrode, whereby output pulses each having an extremely short rise time can be obtained at the output terminal as a result of the non-conduction and conduction, respectively, of the step recovery diode and the switching diode in response to an output pulse of the pulse generation means.

Claim 7

A pulse generator having an output terminal for producing uni-directional pulses comprising: pulse generation means having an output conductor, transfer impedance circuit means transmissible of a dc current and having an input conductor and an output conductor, said input conductor being connected to the output of the pulse generation means for shaping the form of pulses produced by said pulse generation means, and for protecting said pulse generation means against excessive loads, a step recovery diode one electrode of which is grounded and the other electrode of which is connected to the output conductor of the transfer impedance circuit means, a switching diode one electrode of which is connected to the output conductor of the transfer impedance circuit means and another electrode of which is connected directly to said pulse generator output terminal, means for causing a forward dc current to flow through the step recovery diode in the absence of a pulse from the pulse generation means, distributed constant circuit means inserted between the transfer impedance circuit means and the said other electrode of the step recovery diode to improve the wave form of the output pulses, and an auxiliary switching diode having one electrode connected to the other electrode of the step recovery diode, said auxiliary switching diode having another electrode, and a dc source means for applying a dc voltage less than the inverse breakdown voltage of the step recovery diode to said other switching diode electrode, whereby output pulses each having an extremely short rise time can be obtained at the output terminal as a result of the non-conduction and conduction, respectively, of the step recovery diode and the switching diode in response to an output pulse of the pulse generation means.

Claim 8

A pulse generator having an output terminal for producing uni-directional pulses comprising: pulse generation means having an output conductor, transfer impedance circuit means transmissible of a dc current and having an input conductor and an output conductor, said input conductor being connected to the output of the pulses generation means for shaping the form of pulses produced by said pulse generation means, and for protecting said pulse generation means against excessive loads, a step recovery diode one electrode of which is grounded and the other electrode of which is connected to the output conductor of the transfer impedance circuit means, a switching diode one electrode of which is connected to the output conductor of the transfer impedance circuit means and another electrode of which is connected directly to said pulse generator output terminal, means for causing a forward dc current to flow through the step recovery diode in the absence of a pulse from the pulse generation means, and an auxiliary switching diode having one electrode connected to said other electrode of the step recovery diode, said auxiliary switching diode having another electrode, and a dc source for applying a dc voltage less than the inverse breakdown voltage of the step recovery diode to said other switching diode electrode, whereby output pulses each having an extremely short rise time can be obtained at tHe output terminal as a result of the non-conduction and conduction, respectively, of the step recovery diode and the switching diode in response to an output pulse of the pulse generation means.

Claim 9

A pulse generator having an output terminal for producing uni-directional pulses comprising: pulse generation means having an output conductor, transfer impedance circuit means transmissible of a dc current and having an input conductor and an output conductor, said input conductor being connected to the output of the pulses generation means for shaping the form of pulses produced by said pulse generation means, and for protecting said pulse generation means against excessive loads, a step recovery diode one electrode of which is grounded and the other electrode of which is connected to the output conductor of the transfer impedance circuit means, a switching diode one electrode of which is connected to the output conductor of the transfer impedance circuit means and another electrode of which is connected directly to said pulse generator output terminal, means for causing a forward dc current to flow through the step recovery diode in the absence of a pulse from the pulse generation means, and an auxiliary switching diode having one electrode connected to said other electrode of the step recovery diode, said auxiliary switching diode having another electrode, and a dc source for applying a dc voltage less than the inverse breakdown voltage of the step recovery diode to said other switching diode electrode, whereby output pulses each having an extremely short rise time can be obtained at tHe output terminal as a result of the non-conduction and conduction, respectively, of the step recovery diode and the switching diode in response to an output pulse of the pulse generation means.