JPS5621404A - Am synchronous detecting circuit - Google Patents
Am synchronous detecting circuitInfo
- Publication number
- JPS5621404A JPS5621404A JP9800979A JP9800979A JPS5621404A JP S5621404 A JPS5621404 A JP S5621404A JP 9800979 A JP9800979 A JP 9800979A JP 9800979 A JP9800979 A JP 9800979A JP S5621404 A JPS5621404 A JP S5621404A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- input
- output
- frequency divider
- 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.)
- Pending
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
- H03D1/22—Homodyne or synchrodyne circuits
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
PURPOSE:To obtain a synchronous detector which does not require a phase shifter, by setting the oscillation frequency of the VCO of the PLL circuit, which is synchronized with an input signal, to the double of the input signal frequency and by frequency-dividing the output of the VCO by 1/2 at the rise and the fall of the oscillation frequency. CONSTITUTION:The oscillation frequency of VCO7 of PLL circuit 1 is set to 910 kHz which is the double of the input intermediate frequency signal, and frequency divider 8 is the 1/2 frequency divider operated by the rise and has the output applied to phase comparator 5. Frequency divider 9 is the 1/2 frequency divider operated at the fall and has the output applied to the second phase comparator 3, and the input inermediate frequency signal is detected synchronously, and the detection output is taken out through LPF4 to obtain a reproducing signal. Phase difference 90 deg. exists between outputs of frequency dividers 8 and 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9800979A JPS5621404A (en) | 1979-07-31 | 1979-07-31 | Am synchronous detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9800979A JPS5621404A (en) | 1979-07-31 | 1979-07-31 | Am synchronous detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5621404A true JPS5621404A (en) | 1981-02-27 |
Family
ID=14207734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9800979A Pending JPS5621404A (en) | 1979-07-31 | 1979-07-31 | Am synchronous detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5621404A (en) |
-
1979
- 1979-07-31 JP JP9800979A patent/JPS5621404A/en active Pending
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