Wide band gate circuits with feedback circuits

Claim 2

A wide band gate circuit with a feedback circuit comprising at least one series element including a first diode and a second diode connected in series opposition; an input terminal for receiving a signal to be measured, said input terminal being connected to one end of said series element; an output terminal connected to the other end of said series element; a source of gate pulse; a third diode connected to the junction between said first and second diode; means to apply a gaTe pulse from said source of gate pulse through said third diode to pass said signal between said input and output terminals only during the interval of said gate pulse; a condenser connected between said output terminal and the ground to store the amplitude of said signal; a shunt element including a relatively low value resistor connected to said junction and a large capacitance connected between said resistor and ground said shunt element acting to prevent a leakage signal from appearing on said output terminal; said third diode and shunt element serving to prevent a portion of said signal to be measured from being reflected by said gate pulse generator back to said input terminal; an amplifier connected to said output terminal; a shaping circuit to accumulate and maintain the peak value of the output from said amplifier; and a feedback circuit to feedback at least a portion of the signal accumulated in said shaping circuit to all of said diodes.

Claim 3

A wide band gate circuit with a feedback circuit comprising a series element including a pair of diodes of opposite polarities; an input terminal connected to one terminal of said series element; means to apply a signal to be measured to said input terminal; an output terminal connected to the other end of said series element; a gate pulse generator; means to apply a gate pulse generated by said gate pulse generator to the junction between said pair of diodes through a third diode; means to normally maintain all of said diodes in nonconductive state; means to render conductive all of said diodes during the interval of said gate pulse; means to store the amplitude of said signal in a capacitance connected between said output terminal and the ground during said interval; a shunt element including a relatively low value resistor connected to said junction and a capacitance of more than 300 pf. connected between said resistor and the ground; an amplifier connected to said output terminal; a shaping circuit connected to the output of said amplifier to accumulate and maintain the peak value of the output from said amplifier; and a feedback circuit having a band width of more than 0.5 GHz. to feedback at least a portion of the signal accumulated and maintained in said shaping circuit to all of said diodes, said shunt element serving to prevent a leakage signal from being amplified by said amplifier to appear on the output thereof and said third diode and shunt element acting to prevent a portion of said signal to be measured from being reflected by said gate pulse generator back to said input terminal.

Claim 4

A wide band gate circuit with a feedback circuit comprising a series element including a pair of diodes of opposite polarities; an input terminal connected to one terminal of said series element; means to apply a signal to be measured to said input terminal; an output terminal connected to the other end of said series element; a gate pulse generator; means to apply a gate pulse generated by said gate pulse generator to the junction between said pair of diodes through a third diode; means to normally maintain all of said diodes in nonconductive state; means to render conductive all of said diodes during the interval of said gate pulse; means to store the amplitude of said signal in a capacitance connected between said output terminal and the ground during said interval; a shunt element including a relatively low value resistor connected to said junction and a capacitance of more than 300 pf. connected between said resistor and the ground; an amplifier connected to said output terminal; a shaping circuit connected to the output of said amplifier to accumulate and maintain the peak value of the output from said amplifier; and a feedback circuit having a band width of more than 0.5 GHz. to feedback at least a portion of the signal accumulated and maintained in said shaping circuit to all of said diodes, said shunt element serving to prevent a leakage signal from being amplified by said amplifier to appear on the output thereof and said third diode and shunt element acting to prevent a portion of said signal to be measured from being reflected by said gate pulse generator back to said input terminal.

Claim 5

The gate circuit according to claim 2 wherein said gate pulse is peaked by the action of said third diode.

Claim 6

The gate circuit according to claim 2 wherein the bias voltage applied across said third diode is varied to vary the amplitude of the gate pulse current flowing through said third diode.

Claim 7

The gate circuit according to claim 2 wherein a differential amplifier is connected between said output terminal and said amplifier, one input of said differential amplifier is connected to said output terminal and the other input of said differential amplifier is connected to said feedback circuit to interrupt the signal fed back through said feedback circuit.

Claim 8

The gate circuit according to claim 5 wherein said differential amplifier comprises two field effect transistors.

Claim 9

A wide band gate circuit with a feedback circuit comprising a diode bridge including four diodes connected in a bridge configuration; means to apply a signal to be measured to an input terminal of said diode bridge; a fifth diode with one electrode connected to the junction between the first and second diodes of said bridge; a gate pulse generator; means to apply a gate pulse from said gate pulse generator to the other electrode of said fifth diode; a sixth diode with one electrode connected to the junction between the third and fourth diodes of said bridge; means to apply a gate pulse from said generator to the other electrode of sAid sixth diode; means to normally maintain all of said diodes in nonconductive state; means to render conductive all of said diodes during the interval of said gate pulse, a capacitor connected between the output terminal of said diode bridge and the ground to store the amplitude of the output signal; shunt elements each including a relatively low value resistor connected to one of said junctions and a capacitance of more than 300 pf. connected between said resistors and the ground; an amplifier connected to said output terminal of said diode bridge; a shaping circuit connected to accumulate and maintain the peak value of the output from said amplifier; and a feedback circuit having a band width of more than 0.5 GHz. to feed back at least a portion of said accumulated and maintained signal to all of said diodes, said shunt elements serving to prevent a leakage signal from being amplified by said amplifier to appear on the output thereof and said fifth and sixth diodes and said shunt elements acting to prevent a portion of said signal to be measured from being reflected by said gate pulse generator back to said input terminal.

Claim 10

A wide band gate circuit with a feedback circuit comprising a diode bridge including four diodes connected in a bridge configuration; means to apply a signal to be measured to an input terminal of said diode bridge; a fifth diode with one electrode connected to the junction between the first and second diodes of said bridge; a gate pulse generator; means to apply a gate pulse from said gate pulse generator to the other electrode of said fifth diode; a sixth diode with one electrode connected to the junction between the third and fourth diodes of said bridge; means to apply a gate pulse from said generator to the other electrode of sAid sixth diode; means to normally maintain all of said diodes in nonconductive state; means to render conductive all of said diodes during the interval of said gate pulse, a capacitor connected between the output terminal of said diode bridge and the ground to store the amplitude of the output signal; shunt elements each including a relatively low value resistor connected to one of said junctions and a capacitance of more than 300 pf. connected between said resistors and the ground; an amplifier connected to said output terminal of said diode bridge; a shaping circuit connected to accumulate and maintain the peak value of the output from said amplifier; and a feedback circuit having a band width of more than 0.5 GHz. to feed back at least a portion of said accumulated and maintained signal to all of said diodes, said shunt elements serving to prevent a leakage signal from being amplified by said amplifier to appear on the output thereof and said fifth and sixth diodes and said shunt elements acting to prevent a portion of said signal to be measured from being reflected by said gate pulse generator back to said input terminal.

Claim 11

The gate circuit according to claim 7 wherein said gate pulse is peaked by said fifth and sixth diodes.

Claim 12

The gate circuit according to claim 7 wherein the bias voltage applied to the fifth and sixth diodes is varied to vary the amplitude of the gate pulse current flowing through these diodes.

Claim 13

The gate circuit according to claim 7 wherein a differential amplifier is connected between said output terminal and said amplifier, one input of said differential amplifier is connected to said output terminal and the other input of said differential amplifier is connected to said feedback circuit to interrupt the signal fed back through said feedback circuit.