Abstract: A circuit for regenerating a clock signal from an NRZ encoded signal. The NRZ signal is filtered, differentiated, and applied to a nested phase-locked loop. The main loop of the phase-locked loop includes a voltage controlled crystal oscillator. The inner loop of the nested phase-locked loop includes a voltage controlled oscillator which multiplies the frequency of the signal provided by the crystal oscillator to obtain the regenerated clock signal. Tunable low pass filters are used in the differentiating circuit as delay elements. The voltage controlled oscillator includes a tunable low pass filter and an integrator. The control voltage for the inner loop voltage controlled oscillator is used to control the low pass filters of the differentiating circuit in a frequency locked loop.

Abstract: A limiting amplifier has between an amplifier input and an amplifier output at least one amplifier stage as well as load components. The amplifier has an output signal limiting device for limiting the maximum amplitude of the output signal and the amplification and includes a current drain device connected to the amplifier stage output and drawing current through the load components. More particularly, the amplifier stage can be a differential amplifier stage with a differential input and a differential output, two current drain devices being connected to each one of the terminals of the differential output.

Abstract: A voltage controlled surface acoustic wave oscillator includes an integrated circuit and a two port resonator connected as a feedback element around the integrated circuit. The integrated circuit includes a phase shifting network and an amplifier directly connected to the phase shifting network.

Abstract: The invention can be related to the technical field of implementation and control of electricity controllable active fibers.In accordance with the invention filters are controlled and implemented with the aid of a differential gain stage. Said stage includes pairs of like amplification components (Q.sub.I11 and Q.sub.I21, Q.sub.I12 and Q.sub.I22, Q.sub.I13 and Q.sub.I23), and groups of series-connected diode components as well as at least one current generator (Q1, Q2, Q3). The forward voltage drop of the diode components has the same current responsiveness as the base-emitter voltage of the amplification components. A filter of the first order includes a differential gain stage with a capacitive component (C) connected across the output of said stage or to its amplification components. A filter of the second order can include two differential gain stages, each with its capacitive component (C1, C2) in circuit.

Abstract: The invention relates to a parachute having a circular canopy and rigging lines secured to the base of said canopy. A continuous strip of material is attached to said rigging lines below the canopy base whereby, during folding up of the canopy during packing of the parachute, a section of the strip between each pair of adjacent rigging lines can be folded in between each respective section of the canopy.