JPS5635535A - Detecting circuit for automatic frequency control - Google Patents
Detecting circuit for automatic frequency controlInfo
- Publication number
- JPS5635535A JPS5635535A JP11107479A JP11107479A JPS5635535A JP S5635535 A JPS5635535 A JP S5635535A JP 11107479 A JP11107479 A JP 11107479A JP 11107479 A JP11107479 A JP 11107479A JP S5635535 A JPS5635535 A JP S5635535A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- pulse
- output
- collector
- transistor
- 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
- 238000001514 detection method Methods 0.000 abstract 1
- 230000035945 sensitivity 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
- H03D13/007—Circuits for comparing the phase or frequency of two mutually-independent oscillations by analog multiplication of the oscillations or by performing a similar analog operation on the oscillations
- H03D13/008—Circuits for comparing the phase or frequency of two mutually-independent oscillations by analog multiplication of the oscillations or by performing a similar analog operation on the oscillations using transistors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
- H03D2200/0001—Circuit elements of demodulators
- H03D2200/0009—Emitter or source coupled transistor pairs or long tail pairs
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
PURPOSE:To stabilize the sensitivity of the wave detection with no use of the compensating circuit or the like, by supplying both the reference pulse and the comparing pulse to the analog multiplying circuit and then giving a sample holding to the output of multiplication in the timing of the reference pulse. CONSTITUTION:The common emitter of the transitors Q2 and Q3 to the collector of the transistor Q1 with the emitter connected to the reference potential terminal; and the common emitter of the transistors Q4 and Q5 is connected to the collector of the transistor Q3 respectively. Thus ananalog multiplying circuit with two stages of the differential amplifier is formed. Then the reference pulse e1 is applied to the base of the transistor Q5, and the comparing pulse e2 is applied to the base of Q3. And the output of multiplication is supplied to the sample-and-hold circuit 22 from the collector of Q5 via the buffer circuit 21. This circuit 22 receives the on/off control by the pulse e1, and this output is applied to the low pass filter 23. And the output of the filter 23 is utilized as the control voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11107479A JPS5635535A (en) | 1979-08-31 | 1979-08-31 | Detecting circuit for automatic frequency control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11107479A JPS5635535A (en) | 1979-08-31 | 1979-08-31 | Detecting circuit for automatic frequency control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5635535A true JPS5635535A (en) | 1981-04-08 |
Family
ID=14551715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11107479A Pending JPS5635535A (en) | 1979-08-31 | 1979-08-31 | Detecting circuit for automatic frequency control |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5635535A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233893A (en) * | 2017-12-05 | 2018-06-29 | 西安工程大学 | A kind of instant communicating system |
-
1979
- 1979-08-31 JP JP11107479A patent/JPS5635535A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233893A (en) * | 2017-12-05 | 2018-06-29 | 西安工程大学 | A kind of instant communicating system |
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