US 4,303,837 AGranted

Waveform synthesizer with digitally controlled phase adjustment of output

AssigneeCSELT - Centro Studi e Laboratori Telecomunicazioni S.p.A.

InventorsRenato Ansaldi, Sergio Vallero

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Abstract

A circuit arrangement for producing a composite waveform comprises a multiplexer controlled by a logic network for successively energizing a load with an aperiodic voltage from a switching circuit and one or more sine waves or other periodic voltages continuously produced by respective oscillation generators. The logic network includes a cycle counter stepped by a selected oscillation generator for terminating the transmission of its output voltage ater a preset number of cycles. An analog comparator, continuously receiving a d-c potential from a manually settable voltage source and a sawtooth voltage from each oscillation generator, emits an enabling pulse to the logic network upon detecting a coincidence between the sawtooth voltage of a selected generator and either the manually selected d-c potential or the sawtooth voltage from another selected oscillation generator.

Claims10

Dependent claims

A controlled generator of an alternating waveform, comprising:

oscillator means for producing a periodic waveform together with a phase-indicating signal in the form of a substantially sawtooth-shaped voltage having the same period as said periodic waveform;
a multiplexer having at least one output, said multiplexer being operationally connected to said oscillator means for selectively switching said waveform onto said output;
a voltage source for supplying a predetermined potential;
comparator means operationally linked to said oscillator means and to said source for generating an enabling pulse upon detecting an equivalence of said potential and said sawtooth-shaped voltage;
and
a logic circuit operationally coupled with said comparator means and with said multiplexer for controlling same in response to said enabling pulse, producing on said output an oscillating voltage having a predetermined initial phase and a predetermined final phase.

3 more elements

Dependencies are inferred from the claim text.