GB547601A - Electrical circuit arrangements for obtaining substantially constant relative phase shifts over a range of frequencies - Google Patents
Electrical circuit arrangements for obtaining substantially constant relative phase shifts over a range of frequenciesInfo
- Publication number
- GB547601A GB547601A GB1284/41A GB128441A GB547601A GB 547601 A GB547601 A GB 547601A GB 1284/41 A GB1284/41 A GB 1284/41A GB 128441 A GB128441 A GB 128441A GB 547601 A GB547601 A GB 547601A
- Authority
- GB
- United Kingdom
- Prior art keywords
- networks
- frequencies
- network
- phase
- degrees
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/18—Networks for phase shifting
- H03H7/21—Networks for phase shifting providing two or more phase shifted output signals, e.g. n-phase output
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/18—Networks for phase shifting
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S84/00—Music
- Y10S84/09—Filtering
Landscapes
- Amplitude Modulation (AREA)
Abstract
547,601. Impedance networks. STANDARD TELEPHONES & CABLES, Ltd., and HODGSON, K. G. Jan. 31, 1941, No. 1284. [Classes 40 (iii) and 40 (v)] Relative phase shifts which are substantially constant over a range of frequencies are obtained between the currents in two or more branches of a circuit by including in each branch a network whose insertion phase angle approximates to a linear function of the logarithm of the frequency. The constantresistance lattice network in Fig. 2, in which L11/C21 = L22/C12= R<2> and L11/L22 = C21/C12 = 4K1<SP>2>, gives a phase shift of 180 degrees at fo, the resonant frequency of one impedance arm and the anti-resonant frequency of the other arm, and has an approximately linear phase characteristic with reference to the logarithm of the frequency for values of K1 greater than 2, as indicated in Fig. 4. Two such networks having the same value of K, and with their critical frequencies relatively displaced will therefore give a substantially constant difference in phase. Greater accuracy may be obtained by the use of lattice networks having three or more elements in each arm, such as that in Fig. 3 which gives phase shifts of 180 degrees and 360 degrees at its two critical frequencies. When a phase difference of 90 degrees is required, it is advantageous to employ a network similar to Fig. 2 in one branch of the circuit and a network similar to Fig. 3 in the other branch with their parameters suitably chosen, or, more generally, one network with n elements in each arm and one network with n+1 elements in each arm, with their critical frequencies forming a geometrical progression. Instead of lattice networks, the equivalent bridged-T networks may be used, that in Fig. 2 for example being equivalent to the network in Fig. 7 in which the coupling between the inductances L0 is dependent on the parameter K1. The phase characteristic can frequently be improved by the addition of resistances, as in Fig. 9, or by modifying the terminating impedances. If the resistances r1, r2 are equal, the attenuation characteristic is symetrical about the critical frequency, but it is usually desirable to make them unequal in order that the attenuation shall be more uniform over the working range. Application.-Networks giving a phase difference of 90 degrees over a range of frequencies may be employed in modulating and demodulating arrangements. Fig. 12 shows a known arrangement in which the carrier is fed to modulators 1, 11 with a phase difference of 90 degrees through simple networks 3, 31, while the modulating frequencies are fed through networks, 5, 51 of the kind described. By suitable poling either side-band may be produced in the output circuit, the other being balanced out. Figs. 13, 14 show modifications, which in addition to producing a single side-band have the property of rejecting modulating frequencies above or below the carrier frequency according to the poling. This feature is of importance in the elimination of second channel interference in receiving circuits. Instead of balancing out one side-band, the output circuits shown in Figs. 16, 17 may be used to produce one side-band in the load 4 and the other in the load 41.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB257867X | 1941-01-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB547601A true GB547601A (en) | 1942-09-03 |
Family
ID=10233286
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1284/41A Expired GB547601A (en) | 1941-01-31 | 1941-01-31 | Electrical circuit arrangements for obtaining substantially constant relative phase shifts over a range of frequencies |
Country Status (4)
Country | Link |
---|---|
US (1) | US2392476A (en) |
BE (1) | BE477467A (en) |
CH (1) | CH257867A (en) |
GB (1) | GB547601A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2135844A (en) * | 1983-02-21 | 1984-09-05 | Nippon Telegraph & Telephone | Oscillator with variable frequency and phase |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2511137A (en) * | 1944-12-16 | 1950-06-13 | Rca Corp | Frequency control |
US2529117A (en) * | 1945-08-30 | 1950-11-07 | Philco Corp | Electrical phase shift system |
US2668238A (en) * | 1946-08-20 | 1954-02-02 | Frederick W Frink | Wide-band phase shifting means |
NL84677C (en) * | 1947-12-05 | |||
US2923871A (en) * | 1954-03-08 | 1960-02-02 | Nathaniel L Cohen | Two-phase variable frequency power supply for motor |
US3083606A (en) * | 1959-03-02 | 1963-04-02 | Don L Bonham | Electrical music system |
US3060389A (en) * | 1959-03-19 | 1962-10-23 | Leonard R Kahn | Audio signal peak energy equalization |
US3805163A (en) * | 1959-05-01 | 1974-04-16 | Hughes Aircraft Co | Image rejection receiver |
US3195073A (en) * | 1961-07-26 | 1965-07-13 | Texas Instruments Inc | Single-sideband suppressed carrier signal generator |
US3263019A (en) * | 1964-03-18 | 1966-07-26 | Hurvitz Hyman | Randomization of phases and frequencies of musical spectra |
FR2618610B1 (en) * | 1987-07-20 | 1989-12-22 | Dassault Electronique | MICROWAVE DELAY DEVICE |
US8542080B2 (en) | 2011-04-08 | 2013-09-24 | Werlatone, Inc. | All-pass network |
US8487716B1 (en) | 2012-09-19 | 2013-07-16 | Werlatone, Inc. | Single-ended phase-shift network |
-
0
- BE BE477467D patent/BE477467A/xx unknown
-
1941
- 1941-01-31 GB GB1284/41A patent/GB547601A/en not_active Expired
-
1942
- 1942-02-27 US US432680A patent/US2392476A/en not_active Expired - Lifetime
-
1946
- 1946-09-09 CH CH257867D patent/CH257867A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2135844A (en) * | 1983-02-21 | 1984-09-05 | Nippon Telegraph & Telephone | Oscillator with variable frequency and phase |
Also Published As
Publication number | Publication date |
---|---|
CH257867A (en) | 1948-10-31 |
US2392476A (en) | 1946-01-08 |
BE477467A (en) |
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