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71. 发明专利

JP2002135072A VOLTAGE CLAMP CIRCUIT 审中-公开
公开(公告)号：JP2002135072A
公开(公告)日：2002-05-10
申请号：JP2001276259
申请日：2001-09-12
申请人： FUSION LIGHTING INC
发明人： GITSEVICH ALEKSANDR , MACLENNAN DONALD A
IPC分类号： H03G11/02 , H03B1/02 , H03B1/04 , H03B5/18 , H03F1/52
摘要： PROBLEM TO BE SOLVED: To provide a voltage clamp circuit for protecting an input of transistors for use in an RF amplifier or oscillator. SOLUTION: A voltage clamp circuit has a PIN diode which connects a first end to a signal line; a capacitor connected between a second end of the PIN diode and a ground, and a reference voltage which is applied to a connection part between the PIN diode and the capacitor. The clamp circuit can be used for limiting a voltage on the signal line within a desirable range. The voltage clamp circuit is operating at a frequency exceeding 300 MHz and a power level of 50 W, while an RF power transistor can be protected from excessive drive conditions. The voltage clamp circuit scarcely exerts adverse influences on circuit operations and efficiency. As a specific example, the voltage clamp circuit involves a power oscillator which protects from a destructive feedback and supplies wattage exceeding 170 RF over 700 MHz.

72. 发明专利

JP2001085947A COLPITTS CRYSTAL OSCILLATION CIRCUIT 失效
公开(公告)号：JP2001085947A
公开(公告)日：2001-03-30
申请号：JP25830599
申请日：1999-09-13
申请人： TOYO COMMUNICATION EQUIP
发明人： MATSUMOTO YOSHIAKI
IPC分类号： H03B1/04 , H03B5/32 , H03B5/36
摘要： PROBLEM TO BE SOLVED: To obtain a circuit suitably suppressing abnormal oscillation due to spurious radiation of an SC-cut crystal vibrator. SOLUTION: The Colpitts crystal oscillation circuit is a common emitter Colpitts crystal oscillation circuit where the emitter of a transistor(TR) 36 is connected to ground with a bypass capacitor for high frequencies. In this case, the bypass capacitor is replaced with a piezoelectric vibrator with a low Q. Thus, abnormal oscillation due to spurious radiation by the SC-cut crystal vibrator can be prevented and a negative resistance characteristic with a sufficiently higher resistance required to start the oscillation can be ensured.

73. 发明专利

JP3142220B2 失效
公开(公告)号：JP3142220B2
公开(公告)日：2001-03-07
申请号：JP7299595
申请日：1995-03-30
IPC分类号： H03B1/00 , H03B1/02 , H03B1/04 , H03B5/12 , H03B5/18 , H04B1/16 , H04B1/26

74. 发明专利

JP3088021B2 失效
公开(公告)号：JP3088021B2
公开(公告)日：2000-09-18
申请号：JP40416390
申请日：1990-12-20
IPC分类号： H01P7/08 , H03B1/00 , H03B1/04 , H03B5/18 , H03B5/30 , H03H9/02 , H05K1/03 , H05K1/09 , H05K1/16 , H05K3/46

75. 发明专利

JP2000252742A TWO-SYSTEM LOCAL OSCILLATOR FOR EVADING MUTUAL INTERFERENCE 失效
公开(公告)号：JP2000252742A
公开(公告)日：2000-09-14
申请号：JP5167199
申请日：1999-02-26
申请人： KANDA TSUSHIN KOGYO KK
发明人： KIMURA HIROAKI
IPC分类号： H05K1/02 , H03B1/00 , H03B1/04 , H05K3/46
摘要： PROBLEM TO BE SOLVED: To make the oscillator small-sized while preventing the influence of interference by providing sets of components of local oscillators on the top and reverse of a multi-layered substrate and incorporating surface earth patterns corresponding to the local oscillators in the multi-layered substrate. SOLUTION: Dielectric layers of the multi-layered substrate and a conductor pattern between them are arranged and via holes for electrically connecting the conductor pattern is arranged penetrating the dielectric layers. On the top side of the multi-layered substrate, the respective components of the 1st oscillator are mounted and on the reverse side, the components of the 2nd local oscillator are mounted. The respective components of a VCO 12, a low-pass filter 11, and a PLL 10 are mounted on the top surface of the multi-layered substrate and a pattern and a via hole regarding the connections, etc., of the PLL 10, low-pass filter 11, and VCO 12 are arranged between those components and surface earth pattern 15. Further, the components of a VCO 22, a low-pass filter 21, and a PLL 20 are mounted on the reverse surface of the multi-layered substrate and a pattern and a via hole are arranged between those components and a surface earth pattern 25.

76. 发明专利

JP2000124740A FREQUENCY SYNTHESIZER 失效
公开(公告)号：JP2000124740A
公开(公告)日：2000-04-28
申请号：JP29639198
申请日：1998-10-19
申请人： MITSUBISHI ELECTRIC CORP
发明人： ITOU MASANORI
IPC分类号： H03B1/04 , H03B28/00
摘要： PROBLEM TO BE SOLVED: To attain the output of wide band frequency while reducing the spurious by using the output signal of a reference signal oscillator as a clock to generate a signal of the designated frequency and also a local oscillation wave of the specific frequency, outputting and multiplying the signal of sum or difference frequency between the output signal of a DDS(direct digital synthesizer) and the local oscillation wave, dividing the output signal of a multiplier and varying the number of divided signals. SOLUTION: A reference oscillator 1 generates a cycle signal having the specific frequency and outputs it to a DDS 2. The DDS 2 outputs a signal of output frequency that is designated by the frequency setting data and on the basis of the timing of a reference clock received from the oscillator 1. A local oscillator 7 outputs a local oscillation wave. The output signal of the DDS 2 and the local oscillation wave of the oscillator 7 are inputted to a frequency converter 8 and converted into a signal of sum or difference frequency of two signals. The frequency of output of the converter 8 is set larger than the that of the output signal of the DDS 2.

77. 发明专利

JP2876947B2 失效
公开(公告)号：JP2876947B2
公开(公告)日：1999-03-31
申请号：JP20458493
申请日：1993-07-27
申请人： NIPPON DENKI KK
发明人： MYA TATSUYA , KAMIMURA KAZUYOSHI
IPC分类号： H01P7/10 , H03B1/04 , H03B5/18

78. 发明专利

JPH1145980A METHOD AND DEVICE FOR REDUCING NOISE IN SMALL-CURRENT OSCILLATOR 失效
公开(公告)号：JPH1145980A
公开(公告)日：1999-02-16
申请号：JP5978898
申请日：1998-03-11
申请人： ST MICROELECTRON INC
发明人： BRADY JAMES
IPC分类号： H01L27/04 , G06F1/18 , H01L21/822 , H03B1/04 , H03B5/32 , H03H7/01
摘要： PROBLEM TO BE SOLVED: To provide a technique for reducing noise in a small-current low frequency circuit provided on a large current high frequency integrated circuit chip. SOLUTION: Components which are affected by noise in a small-current low frequency circuit 62 are positioned outside an integrated circuit chip 52 as an off-chip array. An exclusive power reference line VSS( REF) is wired as extended from a power bus in the integrated circuit chip via a tap. The reference line VSS( REF) is led out from an inner power bus of an on-chip via a tap at a physical position adjacent to the small current low frequency circuit and then routed to the off-chip. Components which are affected by noise are provided between the small current low frequency circuit 62 and the reference line VSS( REF) . In this case, a noise difference between power supplied to the small current low-frequency circuit of the off-chip and power supplied to the noise- affected components can be minimized.

79. 发明专利

JPH10284937A CIRCUIT FOR EVADING PARASITIC OSCILLATION MODE IN OSCILLATOR RESONANCE CIRCUIT 失效
公开(公告)号：JPH10284937A
公开(公告)日：1998-10-23
申请号：JP7306598
申请日：1998-03-09
申请人： THOMSON BRANDT GMBH
发明人： BLAUD PHILLIPPE , RIEGER MARTIN , SCHEMMANN HEINRICH
IPC分类号： H03B1/04 , H03B5/12
摘要： PROBLEM TO BE SOLVED: To reduce obstruction influence in a harmonic oscillator by permitting two external LC circuit connecting pins to be adequate and balance-constituting a serial resonance circuit by means of including a housing inductance with the two pins and an integrated capacitance. SOLUTION: Transistors T1 and T2 are constituted in a form which is connected to voltage sources U1 and U2 and constant current sources S1 and S2 so as to obtain balance. In the resonance circuit, a part is incorporated as the shape of fixed capacitances CBE, CEE and CBE, a part is constituted by an external serial fixing industance LF and a variable capacitance diode DC and, then, a frequency can be set. The two pins are made into a model as a bonding wire inductance LP. They are the effective configuration elements of the resonating circuit so that a parasitic resonance circuit is not formed and, then, the generation of a parasitic frequency oscillation mode is prevented. Thus, a wide frequency tuning range being about one octave within the range of 0.5-14 GHz and excellent phase noise are provided.

80. 发明专利

JP2684802B2 失效
公开(公告)号：JP2684802B2
公开(公告)日：1997-12-03
申请号：JP180190
申请日：1990-01-08
IPC分类号： H03B1/00 , H03B1/04 , H05K5/00 , H05K9/00

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