JPS6424632A - Phase locked loop circuit - Google Patents
Phase locked loop circuitInfo
- Publication number
- JPS6424632A JPS6424632A JP62179935A JP17993587A JPS6424632A JP S6424632 A JPS6424632 A JP S6424632A JP 62179935 A JP62179935 A JP 62179935A JP 17993587 A JP17993587 A JP 17993587A JP S6424632 A JPS6424632 A JP S6424632A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- circuit
- vco
- signal
- 360mhz
- 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
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
PURPOSE:To prevent spurious radiation with a comparatively simple circuit constitution by providing a signal suppressing circuit means eliminating a frequency component being (n)-fold of the frequency of an input signal, and further, as required, 1/n-fold between a low pass filter and a voltage controlled oscillation circuit VCO. CONSTITUTION:The signal suppression circuit 3a composed of an adder circuit 32 and a delay circuit 31 whose delay time (tau) is 1/2fr is provided on a post- stage of a phase comparator 11 and a low pass filter 12, and its output signal is applied to the VCO 14. A frequency divider 15 is connected between the VCO 14 and the phase comparator 11. The input frequency 10MHz is FM- modulated by the VCO 14 to become an output signal SOUT in a frequency of 360MHz. On the other hand, a spurious component is outputted at a position deviated by 10MHz at both sides of the frequency of 360MHz, but it is removed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62179935A JPS6424632A (en) | 1987-07-21 | 1987-07-21 | Phase locked loop circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62179935A JPS6424632A (en) | 1987-07-21 | 1987-07-21 | Phase locked loop circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6424632A true JPS6424632A (en) | 1989-01-26 |
Family
ID=16074509
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62179935A Pending JPS6424632A (en) | 1987-07-21 | 1987-07-21 | Phase locked loop circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6424632A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8253469B2 (en) | 2008-09-30 | 2012-08-28 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device |
JP2015039179A (en) * | 2002-08-28 | 2015-02-26 | クゥアルコム・インコーポレイテッドQualcomm Incorporated | Method and apparatus for phase locked loop |
-
1987
- 1987-07-21 JP JP62179935A patent/JPS6424632A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015039179A (en) * | 2002-08-28 | 2015-02-26 | クゥアルコム・インコーポレイテッドQualcomm Incorporated | Method and apparatus for phase locked loop |
US8253469B2 (en) | 2008-09-30 | 2012-08-28 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device |
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