公开(公告)号：US3902140A

公开(公告)日：1975-08-26

申请号：US29846672

申请日：1972-10-18

Applicant: GREBENE ALAN B

Inventor： GREBENE ALAN B

IPC: H03B1/00 ,  H03K3/282 ,  H03K4/02 ,  H03K4/06 ,  H03K4/52 ,  H03K7/06 ,  H04L27/12

CPC classification number: H03K4/06 ,  H03B2201/0275 ,  H03B2201/0283 ,  H03K3/2821 ,  H03K4/026 ,  H03K4/52 ,  H03K7/06 ,  H04L27/12

Abstract: A digitally controlled oscillator includes an emitter coupled multivibrator with weighted current sources driving the timing capacitor of the multivibrator the weighted current sources being driven by a binary input signal to produce an output frequency corresponding to the binary weight of the input signal. The multivibrator produces output waveforms of either square, triangular or sine waveshapes. The sine wave output is accomplished by the use of anti-parallel diodes in conjunction with the triangular wave output circuitry.