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公开(公告)号：DE69429066T2
公开(公告)日：2002-08-29
申请号：DE69429066
申请日：1994-12-20
Applicant: SONY CORP
Inventor： ISHIKAWA NOBUYUKI , IMAI TADASHI
Abstract: An oscillator is provided with an oscillation circuit including two oscillation transistors (Q2,Q1), comprising a differential pair, and a resonance circuit (RSNa) connected in common to the bases of the oscillation transistors (Q2,Q1). The bases of the oscillation transistors (Q2,Q1) are short-circuited by a coil (L2), a center tap coil (L3) is connected in parallel to the resonance circuit (RSNa), and variable capacitance diodes (VC1,VC2) in the resonance circuit (RSNa) are driven by a coil (L4) connected to a mixing circuit (MIX). Due to this, it is possible to prevent the occurrence of low frequency noise, possible to realise a completely balanced operation, possible to avoid the oscillation carrier flowing into the power source and ground, and, when the oscillation circuit is used in a television tuner, possible to reduce the noise in a television picture.
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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：DE69220276T2
公开(公告)日：1997-11-13
申请号：DE69220276
申请日：1992-03-30
Applicant: SONY CORP , ALPS ELECTRIC CO LTD
Inventor： ISHIKAWA NOBUYUKI , NISHIMORI EIJI
Abstract: A radio frequency (RF) modulator comprises a double balance type mixer (52, 53) for generating an RF output signal by modulating a high frequency signal, supplied thereto from an RF carrier generating source (54, 56,) with a predetermined signal, a switching circuit (63) for switching a flow of current of the mixer (52, 53) in response to the PAL mode and the SECAM mode, a SECAM audio modulator (50) for amplitude-modulating a SECAM audio signal supplied thereto and supplying an amplitude-modulated SECAM audio signal to the mixer, a PAL audio modulator (51) for frequency-modulating a PAL audio signal supplied thereto and supplying a frequency-modulated PAL audio signal to the mixer, and a PAL/SECAM switching circuit (67) for controlling operational states of respective circuits in response to a mode switching signal supplied thereto, so that an audio signal is amplitude-modulated and a video signal is positively modulated in the SECAM mode, while the audio signal is frequency-modulated and the video signal is negatively modulated in the PAL mode.
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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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公开(公告)号：AU563965B2
公开(公告)日：1987-07-30
申请号：AU2183983
申请日：1983-11-30
Applicant: SONY CORP
Inventor： ISHIKAWA NOBUYUKI
Abstract: @ An oscillating circuit is disclosed which includes first stage (21 A) and second stage (21 B) amplifiers, a feedback circuit formed of a capacitor (Ca) and a resistor (Ra) and connected between the output terminal of the second stage amplifier and the input terminal of the first stage amplifier and a crystal resonator (X) having a predetermined resonance frequency connected to the first stage amplifier. In this case, the total gain of the oscillating circuit is determined in such a manner that the oscillating circuit initiates its oscillation only when the crystal resonator is connected to the first stage amplifier.
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Patent Agency Ranking
公开(公告)号：DE3371149D1
公开(公告)日：1987-05-27
申请号：DE3371149
申请日：1983-11-30
Applicant: SONY CORP
Inventor： ISHIKAWA NOBUYUKI
Abstract: @ An oscillating circuit is disclosed which includes first stage (21 A) and second stage (21 B) amplifiers, a feedback circuit formed of a capacitor (Ca) and a resistor (Ra) and connected between the output terminal of the second stage amplifier and the input terminal of the first stage amplifier and a crystal resonator (X) having a predetermined resonance frequency connected to the first stage amplifier. In this case, the total gain of the oscillating circuit is determined in such a manner that the oscillating circuit initiates its oscillation only when the crystal resonator is connected to the first stage amplifier.
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公开(公告)号：DE69429066D1
公开(公告)日：2001-12-20
申请号：DE69429066
申请日：1994-12-20
Applicant: SONY CORP
Inventor： ISHIKAWA NOBUYUKI , IMAI TADASHI
Abstract: An oscillator is provided with an oscillation circuit including two oscillation transistors (Q2,Q1), comprising a differential pair, and a resonance circuit (RSNa) connected in common to the bases of the oscillation transistors (Q2,Q1). The bases of the oscillation transistors (Q2,Q1) are short-circuited by a coil (L2), a center tap coil (L3) is connected in parallel to the resonance circuit (RSNa), and variable capacitance diodes (VC1,VC2) in the resonance circuit (RSNa) are driven by a coil (L4) connected to a mixing circuit (MIX). Due to this, it is possible to prevent the occurrence of low frequency noise, possible to realise a completely balanced operation, possible to avoid the oscillation carrier flowing into the power source and ground, and, when the oscillation circuit is used in a television tuner, possible to reduce the noise in a television picture.
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公开(公告)号：DE69220276D1
公开(公告)日：1997-07-17
申请号：DE69220276
申请日：1992-03-30
Applicant: SONY CORP , ALPS ELECTRIC CO LTD
Inventor： ISHIKAWA NOBUYUKI , NISHIMORI EIJI
Abstract: A radio frequency (RF) modulator comprises a double balance type mixer (52, 53) for generating an RF output signal by modulating a high frequency signal, supplied thereto from an RF carrier generating source (54, 56,) with a predetermined signal, a switching circuit (63) for switching a flow of current of the mixer (52, 53) in response to the PAL mode and the SECAM mode, a SECAM audio modulator (50) for amplitude-modulating a SECAM audio signal supplied thereto and supplying an amplitude-modulated SECAM audio signal to the mixer, a PAL audio modulator (51) for frequency-modulating a PAL audio signal supplied thereto and supplying a frequency-modulated PAL audio signal to the mixer, and a PAL/SECAM switching circuit (67) for controlling operational states of respective circuits in response to a mode switching signal supplied thereto, so that an audio signal is amplitude-modulated and a video signal is positively modulated in the SECAM mode, while the audio signal is frequency-modulated and the video signal is negatively modulated in the PAL mode.
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公开(公告)号：AU2183983A
公开(公告)日：1984-06-07
申请号：AU2183983
申请日：1983-11-30
Applicant: SONY CORP
Inventor： ISHIKAWA NOBUYUKI
Abstract: @ An oscillating circuit is disclosed which includes first stage (21 A) and second stage (21 B) amplifiers, a feedback circuit formed of a capacitor (Ca) and a resistor (Ra) and connected between the output terminal of the second stage amplifier and the input terminal of the first stage amplifier and a crystal resonator (X) having a predetermined resonance frequency connected to the first stage amplifier. In this case, the total gain of the oscillating circuit is determined in such a manner that the oscillating circuit initiates its oscillation only when the crystal resonator is connected to the first stage amplifier.
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公开(公告)号：DE69535414T2
公开(公告)日：2007-12-06
申请号：DE69535414
申请日：1995-04-06
Applicant: SONY CORP
Inventor： ISHIKAWA NOBUYUKI
Abstract: The present invention provides a frequency modulation circuit which varies the resonance frequency of an LC resonance circuit (12), and which corresponds to the frequency modulation conversions of all TV standards with a simple constitution. A plurality of passive element series circuits (C10, R80; C11, R81; C12, R82) for varying the time constant of the LC resonance circuit (12) is composed of, for instance, a capacitor and a resistor, which is switched and controlled by connecting to or separating from the LC resonance circuit by switching means such as a transistor (Q81 - Q83). Thereby, the oscillation frequency of the LC resonance circuit can be easily converted to a predetermined frequency.
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