JPS5752270A - Phase detecting circuit - Google Patents
Phase detecting circuitInfo
- Publication number
- JPS5752270A JPS5752270A JP12604480A JP12604480A JPS5752270A JP S5752270 A JPS5752270 A JP S5752270A JP 12604480 A JP12604480 A JP 12604480A JP 12604480 A JP12604480 A JP 12604480A JP S5752270 A JPS5752270 A JP S5752270A
- Authority
- JP
- Japan
- Prior art keywords
- trs
- circuit
- current
- drop
- constant
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Synchronizing For Television (AREA)
Abstract
PURPOSE:To offset characteristics of control sensitivity and detection sensitivity in a low voltage working area, and to prevent a drop of a DC loop gain, by decreasing a current of a constant-current circuit as a logarithmic function, against the oscillation frequency control sensitivity which is increased as a hyperbolic function by voltage reduction. CONSTITUTION:A differential pair of transistors TRs 6,7 constituting a switching circuit are provided on a phase detecting circuit of an AFC circuit of a TV set, the same bias is supplied to the base of each TRs 6, 7 through resistances 13, 14, and a comparison voltage input terminal B is connected to the base of the TR 7. Also, loads by TRs 8, 9 are connected to the collectors of the TRs 6, 7, an output terminal C is connected to the collector of the TR7, and a constant-current circuit 26 is connected in common to the emitters of the TRs 6, 7. Furthermore, a TR23 of diode-connection is connected to a TR10 of the circuit 26, and when there is an input to a reference signal input terminal A, a current is inputted to the TRs 6, 7. When this current is decreased as a logarithmic function against supply voltage Vcc, a drop of a DC loop gain is prevented.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12604480A JPS6046592B2 (en) | 1980-09-12 | 1980-09-12 | Phase detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12604480A JPS6046592B2 (en) | 1980-09-12 | 1980-09-12 | Phase detection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5752270A true JPS5752270A (en) | 1982-03-27 |
JPS6046592B2 JPS6046592B2 (en) | 1985-10-16 |
Family
ID=14925261
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12604480A Expired JPS6046592B2 (en) | 1980-09-12 | 1980-09-12 | Phase detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6046592B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63292372A (en) * | 1987-05-26 | 1988-11-29 | Nec Corp | Graphic display system |
-
1980
- 1980-09-12 JP JP12604480A patent/JPS6046592B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS6046592B2 (en) | 1985-10-16 |
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