GB1021285A - Phase-locked pulse generator - Google Patents
Phase-locked pulse generatorInfo
- Publication number
- GB1021285A GB1021285A GB32221/64A GB3222164A GB1021285A GB 1021285 A GB1021285 A GB 1021285A GB 32221/64 A GB32221/64 A GB 32221/64A GB 3222164 A GB3222164 A GB 3222164A GB 1021285 A GB1021285 A GB 1021285A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phase
- output
- voltage
- multivibrator
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000003990 capacitor Substances 0.000 abstract 5
- 230000035559 beat frequency Effects 0.000 abstract 3
- 230000000295 complement effect Effects 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D13/00—Circuits for comparing the phase or frequency of two mutually-independent oscillations
- H03D13/003—Circuits for comparing the phase or frequency of two mutually-independent oscillations in which both oscillations are converted by logic means into pulses which are applied to filtering or integrating means
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
- H03L7/113—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using frequency discriminator
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
- H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
1,021,285. Automatic phase control systems. STANDARD TELEPHONES & CABLES Ltd. Aug. 7, 1964 [Aug. 8, 1963], No. 32221/64. Heading H3A. In a pulse code modulation receiving system a multi-vibrator is locked in phase with incoming digit pulses by a feed-back loop but if the beat frequency between the pulse trains exceeds a limit a bi-stable circuit is actuated to sweep the control voltage and multivibrator frequency through a range of values until frequency synchronism is again reached, and thus the phase control loop again rendered operative. The phase comparator may be an exclusive OR circuit (delivering a constant voltage output during intervals when only one of the pulse inputs is present, and using a pair of AND and a pair of inverter circuits feeding an OR gate) producing a trapezoidal D.C. output constant over initial, final and middle phase differences and increasing or decreasing linearly over intermediate phase differences. Alternatively, a similar circuitry may produce a similar output when both pulse inputs are simultaneously present or absent, and in a limiting case the trapezoidal output curve becomes an isosceles triangle. The phase discriminator output and the multivibrator output are both applied through identical low-pass filters to a differential amplifier. The two filters have D.C. outputs, equal when the pulses are in phase quadrature, i.e. the leaving or trailing edge of the multivibrator pulse coincides with the centre of the incoming digit signal pulses, and the phase discriminator output then has the same value for absence of incoming signal pulses or when the beat frequency is so high that it is suppressed by the filter following the discriminator. During this equality the phase difference also lies on the sloping side of the trapezoid output curve. The differential amplifier 131 (Fig. 9) comprises two pairs of complementary type transistors connected in series and forming Class B amplifiers, feeding through additional complementary type transistor amplifiers 141, 142 a positive or negative voltage to a capacitor 145 which is connected through a pair of emitter followers 146, 147 forming a high input impedance circuit with the phase-controlled multivibrator. The control voltage in the capacitor 145 cannot exceed limits ŒV. During de-synchronization and when the beat frequency is high and suppressed by the filters feeding the differential amplifier, the phase control loop produces zero output but a de-synchronization voltage may then be derived, from the discriminator and used to apply a voltage +V (instead of a normal clamping voltage - V) through diode 168 to the capacitor 145, and to switch over a bi-stable circuit so that a transistor 151, normally blocked, is rendered conducting. A voltage is then applied over diode 167 to the input line 14b leading from the filter fed by the controlled multivibrator so that a negative voltage tending to- V is applied to the capacitor 145 now charged to +V, and the multivibrator frequency is therefore swept through its control range until, when frequency synchronism is just exceeded during the sweep, the point R becomes positive to control the capacitor 145 and through diode 165 to switch over the bistable circuit to its normal condition with transistor 151 blocked.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR944121A FR1379675A (en) | 1963-08-08 | 1963-08-08 | Phase Locked Oscillators Improvements |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1021285A true GB1021285A (en) | 1966-03-02 |
Family
ID=8810164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB32221/64A Expired GB1021285A (en) | 1963-08-08 | 1964-08-07 | Phase-locked pulse generator |
Country Status (6)
Country | Link |
---|---|
BE (1) | BE651517A (en) |
CH (1) | CH417683A (en) |
DE (1) | DE1221278B (en) |
FR (1) | FR1379675A (en) |
GB (1) | GB1021285A (en) |
NL (1) | NL6409070A (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1280304B (en) * | 1965-04-20 | 1968-10-17 | Fujitsu Ltd | Method for channeling in and out channeling time share signals in time division multiplex systems |
FR1452049A (en) * | 1965-04-30 | 1966-02-25 | Labo Cent Telecommunicat | Phase discriminator |
DE1299700B (en) * | 1966-06-13 | 1969-07-24 | Siemens Ag | Regenerating device for pulse trains in systems for the transmission of electrical messages in digital form |
CH511442A (en) * | 1970-07-10 | 1971-08-15 | Siemens Ag Albis | Circuit arrangement in an electrical distance measuring device for pulling the frequency of the measuring oscillator to a frequency that is higher or lower by a certain predetermined amount |
CH539978A (en) * | 1972-05-24 | 1973-07-31 | Wirth Gallo & Co | Device for controlling the frequency and phase of an oscillator |
JPS561619A (en) * | 1979-06-19 | 1981-01-09 | Toshiba Corp | Phase comparator |
-
1963
- 1963-08-08 FR FR944121A patent/FR1379675A/en not_active Expired
-
1964
- 1964-07-28 DE DEST22463A patent/DE1221278B/en active Pending
- 1964-08-03 CH CH1015564A patent/CH417683A/en unknown
- 1964-08-07 BE BE651517D patent/BE651517A/xx unknown
- 1964-08-07 GB GB32221/64A patent/GB1021285A/en not_active Expired
- 1964-08-07 NL NL6409070A patent/NL6409070A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
NL6409070A (en) | 1965-02-09 |
FR1379675A (en) | 1964-11-27 |
BE651517A (en) | 1965-02-08 |
DE1221278B (en) | 1966-07-21 |
CH417683A (en) | 1966-07-31 |
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