Abstract: A method of modulating a microwave carrier and a modulating device are disclosed make it possible directly, onto a microwave carrier right at the operating frequency, to modulate an information signal from a digital bit-stream without the use of a conventional up-conversion chain or frequency multiplication after the modulation. A fast ferroelectric element is provided and operated with a variable voltage source controlled directly by the digital bit-stream representing the information to be modulated. The element can either be positioned between a microwave power amplifier and a radiating antenna device or even close in front of the antenna such that a collimated beam must pass through the modulation device. The element will then be able to introduce phase modulation of a passing microwave carrier.

Abstract: A switched-capacitor circuit includes a plurality of sequentially-operated switched-capacitors A first capacitor is arranged to be coupled and thereafter uncoupled to an input signal during a first time period. Thereby the first capacitor is charged to an input value in dependence on the input signal. A second capacitor is arranged to be coupled and thereafter uncoupled to the first capacitor during a second time period for charge distribution between the second and first capacitor. Pairwise charge distribution is possibly done with further sequentially-operated switched capacitors. A final capacitor is arranged to be coupled and thereafter uncoupled to a previous capacitor during the final time period for charge distribution between the final and the previous capacitor. The switched-capacitor circuit further includes selectively coupling the first and the second sequentially-operated switched-capacitors to an output circuit thereby enabling a desired weighting of the input signal to be attained.