Northrop Grumman Systems Corporation

Eric Michael Mrozek

Mark Kintis

Craig A Hornbuckle

Flavia S Fong

Scott Lee Sing

A distributed weighting network that employs a summing line including distributed summing blocks disposed thereon. Each summing block includes a plurality of resistors that define a resistor divider network. Each summing block includes at least three ports having an input port, an output port and at least one signal port. A signal applied to each signal port of the summing blocks is modified in amplitude by the resistor divider network and summed with the signal propagating along the summing line being input to the input port and output from the output port of each summing block to provide a combined signal. The distributed weighting network can be part of a digital-to-analog converter or a QAM modulator.

High-order wide band modulators and multiplying digital-to-analog converters using distributed weighting networks

A comb frequency generator that is tunable to vary the width of the pulses in the output signal and achieve a maximum power output at different harmonic frequencies. A wavefront compression device receives a sinusoidal input signal and provides wavefront compression to create a compressed signal having a series of periodic fast edges. A delay device receives the fast-edge compressed signal and delays the fast-edge signal to create a delayed fast-edge signal. A combining device receives the original fast-edge compressed signal and the delayed fast-edge compressed signal to generate an output signal including a series of pulses having a width determined by the delay of the delayed signal. In one embodiment, the delay device is a shorted transmission line stub having a length selectively set by a series of MEM devices. In another embodiment, the delay device is an NLTL variable time delay device that delays the fast-edge signal.

Tunable, maximum power output, frequency harmonic comb generator

A multidetector ( ) circuit for use in a plurality of carrier recovery systems ( ) for recovery for a suppressed carrier modulated signal. The multidetector ( ) receives demodulated, in-phase x and quadrature phase y components of a baseband signal (s (t)) and generates output signals for use in a plurality of carrier recovery systems ( ). The multidetector ( ) generates a lock detection signal that varies primarily in accordance with a lock signal x y and a fourth-order amplitude detection signal (x &plus;y ) for use in either system. The multidetector particularly generates a phase error signal xy(x &minus;y ) for use in a Costas carrier recovery system ( ). The multidetector also generates a second-order amplitude detection signal (x &plus;y ) for use in either system which can be used to adjust the amplitude of the incoming, modulated signal in order to control the loop gain of the carrier recovery phase locked loop.

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Gardena, CA, United States of America

Eric Michael Mrozek