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公开(公告)号：CA1210086A
公开(公告)日：1986-08-19
申请号：CA455254
申请日：1984-05-28
Applicant: SONY CORP
Inventor： ISHIKAWA FUMIO , TANAKA KUNINOBU
Abstract: A two phase voltage signal generating circuit for generating a pair of trapezoidal wave signals of phases opposite to each other is disclosed which includes an input terminal supplied with an input pulse signal, a capacitor, a pair of voltage limiting circuits connected to both ends of the capacitor respectively and for limiting the voltage at each end of the capacitor within a predetermined voltage range, a current control circuit controlled by the input pulse signal and for supplying a charge or discharge current to the capacitor to generate the pair of trapezoidal wave voltage of the trapezoidal wave voltage signals and a symmetry control circuit controlled by an output of the detecting circuit and for controlling the charge or discharge current such that the pair of trapezoidal wave voltage signals become substantially symmetrical to each other.
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公开(公告)号：AU2713477A
公开(公告)日：1979-01-25
申请号：AU2713477
申请日：1977-07-19
Applicant: SONY CORP
Inventor： ISHIKAWA FUMIO , TSUDA YUKIO
Abstract: A high frequency wide band resonant circuit is formed of a lump capacitor, a lump inductor and a voltage controlled variable capacitor. The resonant circuit is suitable to be used in a receiving circuit which selectively receives a signal in the UHF band.
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公开(公告)号：DE69032520T2
公开(公告)日：1999-03-04
申请号：DE69032520
申请日：1990-12-07
Applicant: SONY CORP
Inventor： ISHIKAWA NOBUYUKI , HIGUCHI HIROSHI , NARAHARA HISAAKI , TANABE SHINICHI , ISHIKAWA FUMIO
Abstract: An RF modulator comprising an FM modulator (22) supplied with an audio signal, an AM modulator (24) supplied with the FM audio output and a video signal, an oscillator (32) for generating a sound subcarrier signal, and an oscillator (7) for generating a main carrier signal. Each of the oscillators (32, 17) consists of a VCO with a PLL circuit, and the entire components are composed of a single IC chip so as to be formed into a compact miniature structure. A modified RF modulator includes a PLL circuit (15) for varying the oscillation frequency of a VCO (17) by a variable frequency divider (18), and a modulation circuit supplied with a modulating signal and the oscillation output of the VCO (17). The division ratio (integer) of the variable frequency divider (18) is continuously varied, and the reference frequency of a reference oscillator (16) is set to be less than a predetermined channel interval frequency, thereby reducing the frequency error in the modulated signal output.
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公开(公告)号：DE3467076D1
公开(公告)日：1987-12-03
申请号：DE3467076
申请日：1984-05-30
Applicant: SONY CORP
Inventor： ISHIKAWA FUMIO
Abstract: A two phase voltage signal generating circuit for generating a pair of trapezoidal wave signals of phases opposite to each other is disclosed which includes an input terminal supplied with an input pulse signal, a capacitor, a pair of voltage limiting circuits connected to both ends of the capacitor respectively and for limiting the voltage at each end of the capacitor within a predetermined voltage range, a current control circuit controlled by the input pulse signal and for supplying a charge or discharge current to the capacitor to generate the pair of trapezoidal wave voltage signals at the both ends of the capacitor, a detecting circuit for detecting the change of the intermediate voltage of the trapezoidal wave voltage signals and a symmetry control circuit controlled by an output of the detecting circuit and for controlling the charge or discharge current such that the pair of trapezoidal wave voltage signals become substantially symmetrical to each other.
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公开(公告)号：DE3470263D1
公开(公告)日：1988-05-05
申请号：DE3470263
申请日：1984-01-27
Applicant: SONY CORP
Inventor： ISHIKAWA FUMIO , TANAKA KUNINOBU
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Patent Agency Ranking
公开(公告)号：CA1092668A
公开(公告)日：1980-12-30
申请号：CA282684
申请日：1977-07-14
Applicant: SONY CORP
Inventor： ISHIKAWA FUMIO , TSUDA YUKIO
Abstract: A high frequency wide band resonant circuit which comprises a first lumped capacitive element, and a parallel series circuit consisting of a lumped inductive element and a voltage controlled variable capacitance element. Connected in parallel to the voltage controlled capacitance element is a second series circuit consisting of a second lumped inductive element and a second lumped capacitive element for supplying the control voltage to the voltage controlled variable capacitance element through the second lumped inductive element and across the second capacitive element. The preferred embodiment further comprises a resistor with one end connected to the connection point between the second inductive element and the second capacitive element to supply therethrough the control voltage to the variable capacitance element and may still further comprise another capacitor connected to the other end of the resistor and in parallel with the second lumped capacitive element to form a .pi. circuit.
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公开(公告)号：DE3280314D1
公开(公告)日：1991-04-18
申请号：DE3280314
申请日：1982-12-23
Applicant: SONY CORP
Inventor： ISHIKAWA FUMIO
Abstract: A sample and hold circuit is disclosed, in which first and second terminals to which are supplied drive currents for turning ON and OFF a diode bridge are respectively connected through capacitors to a connection point between output electrodes of switching elements, a diode is connected between the first and second terminals for short- circuiting the capacitors when the diode bridge is made OFF, and input electrodes of the switching elements are respectively connected to first and second points of a reference potential whereby said diode bridge is made ON by a drive current flowing from the first point to the second point of the reference potential.
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公开(公告)号：CA1203855A
公开(公告)日：1986-04-29
申请号：CA446138
申请日：1984-01-26
Applicant: SONY CORP
Inventor： ISHIKAWA FUMIO , TANAKA KUNINOBU
Abstract: A buffer circuit having a main buffer circuit section formed of a pair of complementary input side transistors the bases of which are connected together and a dummy circuit section having the same circuit construction as the main buffer circuit section. A feedback signal formed on the basis of the output from the dummy circuit section is supplied to the dummy circuit section and the main buffer circuit section so as to make the output of the dummy circuit section equal to a predetermined value,
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公开(公告)号：DE2733191A1
公开(公告)日：1978-01-26
申请号：DE2733191
申请日：1977-07-22
Applicant: SONY CORP
Inventor： ISHIKAWA FUMIO , TSUDA YUKIO
Abstract: A high frequency wide band resonant circuit is formed of a lump capacitor, a lump inductor and a voltage controlled variable capacitor. The resonant circuit is suitable to be used in a receiving circuit which selectively receives a signal in the UHF band.
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公开(公告)号：DE69032520D1
公开(公告)日：1998-09-03
申请号：DE69032520
申请日：1990-12-07
Applicant: SONY CORP
Inventor： ISHIKAWA NOBUYUKI , HIGUCHI HIROSHI , NARAHARA HISAAKI , TANABE SHINICHI , ISHIKAWA FUMIO
Abstract: An RF modulator comprising an FM modulator (22) supplied with an audio signal, an AM modulator (24) supplied with the FM audio output and a video signal, an oscillator (32) for generating a sound subcarrier signal, and an oscillator (7) for generating a main carrier signal. Each of the oscillators (32, 17) consists of a VCO with a PLL circuit, and the entire components are composed of a single IC chip so as to be formed into a compact miniature structure. A modified RF modulator includes a PLL circuit (15) for varying the oscillation frequency of a VCO (17) by a variable frequency divider (18), and a modulation circuit supplied with a modulating signal and the oscillation output of the VCO (17). The division ratio (integer) of the variable frequency divider (18) is continuously varied, and the reference frequency of a reference oscillator (16) is set to be less than a predetermined channel interval frequency, thereby reducing the frequency error in the modulated signal output.
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