Thales

Gilles Guerbeur

Philippe Dueme

Thierry Briand

A microwave receiver measures the frequency F of a microwave signal in a band of frequencies whose maximum frequency is Fmax. The receiver has N frequency measuring digital stages EE, . . . Ek, . . . EN providing N ambiguous frequency measurements FmFm, . . . Fmk, . . . FmN of the signal received, the signal received being sampled, in each digital stage, at a respective sampling frequency FeFe, . . . Fek, . . . FeN. The receiver further includes an ambiguity resolving device () receiving the N frequency measurements and providing the frequency F of the signal received. Each frequency measuring digital stage Ek has a one-bit analog/digital converter () fed directly with the microwave signal received by the receiver, means for performing a discrete Fourier transform on the basis of the samples output by the one-bit converter, and at least one detector () of spectral line maximum of the discrete Fourier transform providing a frequency measurement Fmk of the signal received.

Frequency measuring broadband digital receiver

An active selector switch with two inputs and two outputs comprises two parts, each part comprising a distributed amplifier whose elementary cells comprise at least two cascode-mounted transistors (Q Q , Q&prime; Q&prime; ), one transistor (Q , Q&prime; ) controlled through the gate line (Lgc ) of the amplifier being associated with each cell, the associated transistor (Q ) of the first part controlling the state of the common-gate transistor (Q&prime; ) of the second part and the associated transistor (Q&prime; ) of the second part controlling the state of the common-gate transistor (Q ) of the first part, the two inputs (E , E ) of the selector switch being the free ends of the gate lines (Ldc ) of the two distributed amplifiers ( ) and the outputs (S , S ) of the selector switch being the free ends of these two amplifiers. The invention can be applied especially to digitally controlled phase control devices.

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Chaville, France

Gilles Guerbeur