专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

31. 发明专利

JP3001735B2 失效
公开(公告)号：JP3001735B2
公开(公告)日：2000-01-24
申请号：JP32381092
申请日：1992-11-10
IPC分类号： H03L7/089 , H03L7/107 , H03L7/187 , H03L7/189 , H03L7/199 , H03L7/093

32. 发明专利

JPH11234129A FREQUENCY SYNTHESIZER AND METHOD THEREFOR 失效
公开(公告)号：JPH11234129A
公开(公告)日：1999-08-27
申请号：JP18157698
申请日：1998-06-12
申请人： HEWLETT PACKARD CO
发明人： PATTERSON JEFFERY S
IPC分类号： H03L7/197 , H03L7/183 , H03L7/189
摘要： PROBLEM TO BE SOLVED: To provide a fractional N frequency synthesizer reduce in spurious radiation. SOLUTION: The output of a variable frequency oscillator 12 is frequency- divided not by a rational number N+.f but by an integer N. The N frequency divided signals and reference signals are phase-compared in a phase comparator 16 and the output signals of a phase prediction device 20 for compensating the.f portion of a desired frequency division ratio N+.f are added in an adder 18 to the compared result. Thus, error signals θ error as the result of phase- comparing the signals for which the output of the variable frequency oscillator is frequency-divided by the frequency division ratio N+.f and the reference signals are obtained.

33. 发明专利

JP2887785B2 失效
公开(公告)号：JP2887785B2
公开(公告)日：1999-04-26
申请号：JP11694997
申请日：1997-05-07
申请人： ERU JII SEMIKON CO LTD
发明人： YON UON RII
IPC分类号： H03L7/00 , H03L7/10 , H03L7/187 , H03L7/189

34. 发明专利

JP2738488B2 失效
公开(公告)号：JP2738488B2
公开(公告)日：1998-04-08
申请号：JP1497193
申请日：1993-02-01
申请人： EICHI II HOORUDEINGUSU INC DEII BII EE HYUUZU EREKUTORONIKUSU
发明人： ARUBAATO II KOSANDO
IPC分类号： H03L7/18 , H03L7/189 , H03L7/199

35. 发明专利

JP2581398B2 失效
公开(公告)号：JP2581398B2
公开(公告)日：1997-02-12
申请号：JP17142793
申请日：1993-07-12
申请人： NIPPON ELECTRIC CO
发明人： NAGAKURA TOMIO
IPC分类号： H03L7/10 , H03L3/00 , H03L7/187 , H03L7/189

36. 发明专利

JPH0730413A PLL FREQUENCY SYNTHESIZER 失效
公开(公告)号：JPH0730413A
公开(公告)日：1995-01-31
申请号：JP17142793
申请日：1993-07-12
申请人： NEC CORP
发明人： NAGAKURA TOMIO
IPC分类号： H03L7/10 , H03L3/00 , H03L7/187 , H03L7/189
摘要： PURPOSE:To provide a frequency synthesizer capable of stably executing high speed frequency pull-in independently of the existence of a temperature change or device dispersion. CONSTITUTION:A control part 10 stores information relating to the frequency control voltage of a voltage controlled oscillator 5 and device status temperature from a temperature detecting circuit 13 in a storage part 12 at the time of stabilizing frequency. When the device is restarted, the control part 10 reads out these information from the storage part 12, reads out the voltage change value of a voltage change corresponding to a current temperature change from a ROM 14 and sends a synthetic digital signal obtained by synthesizing respective voltage values to a D/A converter 11. The D/A converter 11 converts the synthetic digital signal and outputs a compensated analog signal compensated at its temperature. Since the output voltage of the compensated analog signal is impressed to a loop filter 8, prescribed frequency is set up in the oscillator 5 through the loop filter 8 when the device is restarted.

37. 发明专利

JPH06152405A PHASE LOCKED LOOP FREQUENCY SYNTHESIZER 失效
公开(公告)号：JPH06152405A
公开(公告)日：1994-05-31
申请号：JP32381092
申请日：1992-11-10
申请人： MITSUBISHI ELECTRIC CORP
发明人： ANDO AKIRA
IPC分类号： H03L7/089 , H03L7/107 , H03L7/187 , H03L7/189 , H03L7/199
摘要： PURPOSE:To reduce error at the time of frequency switching and to shorten frequency pull-in time by switching the frequency dividing ratios of reference and comparative frequency dividers and performing initial phase matching by reset. CONSTITUTION:A control voltage VL provided through a first loop filter F1 is charged/discharged to the capacitor 110 of another second loop filter F2 by a voltage follower 118. Thus, the same frequency is kept even after switches 107 and 104 are changed over to the side of '0' by a switch changeover signal FLTSW. At the same time, the control voltage of a frequency fine adjustment terminal Q is changed, and a transmission frequency is shifted downward. Consequently, the voltage of a frequency control terminal P at a voltage controlled oscillator(VCO) 101 does not change but matches the lower side just by the component of shifting the transmission frequency. Then, a switch 122 is turned on by a switch changeover signal PDTSW, a loop is closed, comparative and reference frequency dividers 102 and 104 are reset by a reset signal DIVRST from a controller 120, and initial phases are matched. Thus, frequency disturbance on a second stage can be suppressed.

38. 发明专利

JPH0613898A FREQUENCY SYNTHESIZER 失效
公开(公告)号：JPH0613898A
公开(公告)日：1994-01-21
申请号：JP16976592
申请日：1992-06-29
申请人： NEC CORP
发明人： JOKURA ATSUSHI
IPC分类号： H03L7/08 , H03L7/089 , H03L7/14 , H03L7/18 , H03L7/189
摘要： PURPOSE:To provide a frequency synthesizer with low power consumption capable of an intermittent operation as holding carrier output even at the time of high-speed changeover for a TDAM system for monitoring adjacent cells inside a communication frame. CONSTITUTION:A voltage coarse adjustment part 3 by a D/A converter is provided on the negative electrode side of the capacitor of the loop filer (LPF) 6 of a PLL loop part 2. The charging/discharging operation of the capacitor of the LPF 6 for the variation of the control voltage values of a voltage controlled oscillator 5 is reduced at the time of changing channels, the influence of dielectric absorption is eliminated and the open-loop/intermittent operation holding the carrier output stabilized by a capacitor charge voltage is performed.

39. 发明专利

JPH0519329B2 失效
公开(公告)号：JPH0519329B2
公开(公告)日：1993-03-16
申请号：JP13990287
申请日：1987-06-05
申请人： ANRITSU CORP
发明人： TAKAHASHI HIROSHI , NISHAMA HITOSHI
IPC分类号： H03L7/187 , H03L7/189

40. 发明专利

JPH0496515A PHASE LOCKED LOOP CIRCUIT AND SEMICONDUCTOR INTEGRATED CIRCUIT 失效
公开(公告)号：JPH0496515A
公开(公告)日：1992-03-27
申请号：JP21410290
申请日：1990-08-13
申请人： FUJITSU LTD
发明人： ASAMI FUMITAKA
IPC分类号： H03L7/18 , G11C11/407 , H03L7/08 , H03L7/10 , H03L7/189
摘要： PURPOSE:To quicken the lockup time by storing each control voltage digital signal as to plural channels at every application of power to a storage section and outputting a prescribed control voltage to a voltage controlled oscillator based on the stored control voltage digital signal. CONSTITUTION:At application of a power supply switch of a phase locked loop circuit, plural input signals receptible at the application of the power are inputted to a phase comparator 2, plural voltage data are stored sequentially in a storage means 8 and when an object specific input signal is received after the application of power, a voltage data relating to the input signal stored in the storage means 8 is read and inputted to a control voltage output means 15 and a prescribed control voltage is outputted to the phase comparator 2 as a feedback voltage. Thus, the effect due to the element having a time constant in a closed loop forming the phase locked loop circuit is excluded to quicken the lockup time.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式