Regenerative pulse transmission circuit

• Main Author: WIDL WALTER HERBERT ERWIN
• Format: Patent
• Language: English
• Published: 12.04.1966
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PULSE TECHNIQUE; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

1,025,450. Transistor circuits. TELEFONAKTIEBOLAGET L. M. ERICSSON. April 5, 1963 [April 5, 1962], No. 13750/63. Heading H3T. A circuit for re-timing pulses and replacing missing pulses comprises a stage M for converting each input pulse into a constant duration pulse, the output of stage M blocking a free-running oscillator O, tuned to the required pulse repetition frequency. The oscillator output is combined with that of stage M and fed to an oscillatory circuit S from which the required pulses are derived. As described, each input pulse is lengthened by a monostable circuit M comprising transistors Tr1 Tr2, giving waveform I M . The oscillator O uses a transistor Tr3 and is tuned by L3, C3 so as to be self-oscillatory at the required repetition frequency except when the diode bridge Br is made conductive by each pulse I M . The oscillator thus re-starts after each pulse I M , as shown at I 0 . Summing resistors D1, D2 combine waveforms I 0 , I M . The combined waveform is fed to a transistor Tr4 so that the tuned load S is excited by each pulse I M . The resulting waveform I s+0 is clipped by transistor Tr5 giving I A2 which is differentiated by means not shown, thus providing more regular output pulses I u .