US4827267A — High availability solid state modulator for micro…

Claim 1

Independent Claim 210 words

In a radar system including at least one CFA stage and a pulse modulator system therefore operating as a current source, the combination comprising: first means including a CFA pulse transformer responsive to a current pulse at high power level at its primary winding to produce and apply to said CFA a voltage stepped up to a peak voltage suitable for operation of said CFA; second means responsive to a low level synchronizing gate signal for successively amplifying the power level of said gate to produce said high power current pulse, said second means comprising at least one module and a plurality of paralleled sub-modules therein, said sub-modules each generating a current pulse as a function of the value of said high power current pulse; a first pulse transformer responsive on its primary winding to said paralleled sub-module outputs producing said high level current pulse at its secondary winding at a first stepped-up peak voltage level; and a second pulse transformer responsive at its primary winding to pulses from said first pulse transformer secondary winding, the terminals of said secondary of said second transformer being connected to the cathode and anode terminals of said CFA; and impedance matching means inserted between said first transformer secondary and said second transformer primary.

Claim 2

Dependent Claim 210 words

In a radar system including at least one CFA stage and a pulse modulator system therefore operating as a current source, the combination comprising: first means including a CFA pulse transformer responsive to a current pulse at high power level at its primary winding to produce and apply to said CFA a voltage stepped up to a peak voltage suitable for operation of said CFA; second means responsive to a low level synchronizing gate signal for successively amplifying the power level of said gate to produce said high power current pulse, said second means comprising at least one module and a plurality of paralleled sub-modules therein, said sub-modules each generating a current pulse as a function of the value of said high power current pulse; a first pulse transformer responsive on its primary winding to said paralleled sub-module outputs producing said high level current pulse at its secondary winding at a first stepped-up peak voltage level; and a second pulse transformer responsive at its primary winding to pulses from said first pulse transformer secondary winding, the terminals of said secondary of said second transformer being connected to the cathode and anode terminals of said CFA; and impedance matching means inserted between said first transformer secondary and said second transformer primary.

Claim 3

Dependent Claim 35 words

The combination according to claim 1 in which an impedance matching network comprising transmission line parameters is inserted between the paralleled outputs of said first pulse transformers and the input to said second pulse transformer.

Claim 4

Dependent Claim 42 words

The combination according to claim 1 in which a diode is connected in series with the output of said paralleled first transformer secondaries and said second pulse transformer primary, said diode being poled to pass pulse currents but block the backswing voltages.

Claim 5

Dependent Claim 191 words

A modular, high power, high availability pulse modulator for a cross field amplifier RF stage in a radar transmitter requiring agility of transmitted frequency, pulse width, repetition frequency and a degree of fail soft capability, comprising: a plurality of pulse modules each including a plurality of sub-module pulse amplifying circuits, each responsive to a video frequency synchronizing pulse to produce a first level modulator pulse, the outputs of said sub-modules being paralleled to provide a module output pulse; a plurality of first module pulse transformers, each of said module pulse transformer having its primary winding connected to receive a corresponding module output pulse; means for paralleling the secondary output pulses from said plurality of module pulse transformers to produce a combined pulse at a higher second power level; a second pulse transformer responsive to said combined pulse at said second power level for producing higher third power level pulses to drive said cross field amplifier stage; fourth means for monitoring the current pulse applied to said CFA and for adjusting the amplitude of said first level modulator pulses to tend to hold said third power level pulse at a predetermined level.

Claim 6

Dependent Claim 191 words

A modular, high power, high availability pulse modulator for a cross field amplifier RF stage in a radar transmitter requiring agility of transmitted frequency, pulse width, repetition frequency and a degree of fail soft capability, comprising: a plurality of pulse modules each including a plurality of sub-module pulse amplifying circuits, each responsive to a video frequency synchronizing pulse to produce a first level modulator pulse, the outputs of said sub-modules being paralleled to provide a module output pulse; a plurality of first module pulse transformers, each of said module pulse transformer having its primary winding connected to receive a corresponding module output pulse; means for paralleling the secondary output pulses from said plurality of module pulse transformers to produce a combined pulse at a higher second power level; a second pulse transformer responsive to said combined pulse at said second power level for producing higher third power level pulses to drive said cross field amplifier stage; fourth means for monitoring the current pulse applied to said CFA and for adjusting the amplitude of said first level modulator pulses to tend to hold said third power level pulse at a predetermined level.

Claim 7

Dependent Claim 69 words

The combination according to claim 4 further comprising a diode in series with the output of each of said module pulse transformers, said diodes being poled to pass the pulse output of each corresponding module pulse transformer output thereby to discriminate against back swing signals to prevent the effect of such back swing currents on the secondary of said module pulse transformers and the corresponding pulse transformer core saturation.

Claim 8

Dependent Claim 36 words

The combination according to claim 4 in which an impedance matching network is connected in series between said paralleled module pulse transformer secondaries and said second pulse transformer primary to optimize power transfer during pulse conditions.

Claim 9

Dependent Claim 69 words

The combination according to claim 4 in which said modules each include synchronously controlled high power solid state current switches to act as power amplifier, and in which a disabling gate having a predetermined duration is applied to said high current switches, said duration, straddling the times of power pulse trailing edges to eliminate the effect of non-synchronous pulse termination in one or more of said solid state switches.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1992-05-01	1992-10-31	1993-05-02	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1996-05-01	1996-10-31	1997-05-02	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2000-05-01	2000-10-31	2001-05-02	$7700.00	Window Closed / Lapsed

High availability solid state modulator for microwave cross-field amplifiers

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