Raytheon Company

Tuan M Tong

Michael Robert Patrizi

William K Mcgehee

John Hudlow

Wesley W Haswell

A control circuit for signal sampling of an analog RF signal includes: a spectrum monitoring circuit for monitoring the analog RF signal to determine a frequency of the analog RF signal; a tunable clock source for generating a tunable sampling clock for sampling the analog RF signal; a sample clock tuning circuit for controlling the tunable clock source and selecting a sample clock frequency of the tunable sampling clock that provides a predetermined ratio between the sample clock frequency of the tunable sampling clock and a center frequency of the analog RF signal; and an Analog-to-Digital Converter (ADC) for sampling the analog RF signal using the tunable sampling clock.

Adaptive control circuit and method for signal-optimized sampling

A configurable radio frequency system. The system includes: a plurality of radio frequency cells connected in a cascade. Each of the radio frequency cells includes an input switch connected to an input of the radio frequency system, an output switch connected to an output of the radio frequency system, and a plurality of elements, each of the elements being connected between the input switch and the output switch. The input switch and the output switch are configured, depending on their respective settings, to cause a radio frequency signal path from an input of the cell to an output of the cell to include one of the elements. The plurality of elements in each cell includes a band pass filter, an attenuator, a through path, an amplifier, and a mixer.

Software-configurable multi-function RF module

A signal generator. A voltage controlled oscillator generates a signal that is fed to a comb generator, e.g., a nonlinear transmission line. A tone, from among a comb of tones at the output of the comb generator, is selected by a bandpass filter, its frequency is divided, e.g., by a direct digital synthesizer, and the result is compared, e.g., by a phase and frequency detector that receives a reference signal at its other input. The output of the phase and frequency detector is fed back, e.g., through a lowpass filter, to the voltage controlled oscillator.

Midband phase noise reducer for PLLS

A signal source with a wireless frequency reference. A signal loop includes an amplifier and a coupler. The magnitude of the loop gain in the signal loop is substantially equal to 1 at a steady-state amplitude of a signal at a fundamental frequency. A reference oscillator is coupled to the loop through the coupler, via a wireless link, and provides phase stabilization. The loop may include a nonlinear transmission line, to generate a comb output spectrum.

Growing community of inventors

Frisco, TX, United States of America

Tuan M Tong