GB592835A - Improvements in or relating to rectifying or demodulating circuits - Google Patents
Improvements in or relating to rectifying or demodulating circuitsInfo
- Publication number
- GB592835A GB592835A GB1392945A GB1392945A GB592835A GB 592835 A GB592835 A GB 592835A GB 1392945 A GB1392945 A GB 1392945A GB 1392945 A GB1392945 A GB 1392945A GB 592835 A GB592835 A GB 592835A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- output
- voltage
- cycle
- instantaneous
- 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
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/08—Demodulation of amplitude-modulated oscillations by means of non-linear two-pole elements
- H03D1/10—Demodulation of amplitude-modulated oscillations by means of non-linear two-pole elements of diodes
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
592,835. Valve circuits for radio reception. JOHNSON,E.A. June 2, 1945, No. 13929. [Class 40 (v)] [Also in Group XXXVIII] In a modulating circuit, a capacitor is changed to a potential proportional to the instantaneous amplitude of the voltage to be demodulated through an electronic switch periodically closed by a reference oscillation Fig. 1 shows an arrangement in which the reference and the modulated potentials (V and v respectively) appear across the secondaries of transformers 2 and 1. Leaky grid valve 4 and hence valve 3 conducts on positive peaks of V so that capacitor 7 is charged or discharged to a potential proportional to the instantaneous sum of V and v, once per reference cycle. In the arrangement of Fig. 3, v and V are applied to transformers 11 and 10. The effect of v is to alter the otherwise equal potentials to which capacitors 14 and 15 are charged on alternate peaks of V, so that a voltage appears at the junction 19 of resistors 17 and 18 with respect to earth, which is adjusted once per cycle of V to the instantaneous value and sign of v when V has its peak. The time constant C16 (R17+R18) is made long compared with the periodicity of V to maintain the output constant between switching periods. To prevent paralysis of the circuit if v exceeds V a relay may be connected across transformer 11 to place a discharge resistor across C 16 if v exceeds a predetermined valve, alternatively C16 may be omitted and the time constant 2C14.C15 (R17+R18)/C14+C15 made of the order of one period of V. A full wave version of Fig. 3 (Fig. 4, not shown) is also given.' The output voltage being adjusted every half cycle of V. A biassed output may be obtained in either case by making R17 and R18 unequal.
Publications (1)
Publication Number | Publication Date |
---|---|
GB592835A true GB592835A (en) | 1947-09-30 |
Family
ID=1730328
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1392945A Expired GB592835A (en) | 1945-06-02 | Improvements in or relating to rectifying or demodulating circuits |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB592835A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2963241A (en) * | 1953-08-11 | 1960-12-06 | Edwin G Swann | Electrical gate phase discriminator |
US3084289A (en) * | 1959-05-01 | 1963-04-02 | Philips Corp | Synchronous demodulator |
-
1945
- 1945-06-02 GB GB1392945A patent/GB592835A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2963241A (en) * | 1953-08-11 | 1960-12-06 | Edwin G Swann | Electrical gate phase discriminator |
US3084289A (en) * | 1959-05-01 | 1963-04-02 | Philips Corp | Synchronous demodulator |
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