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公开(公告)号：JPH02156755A
公开(公告)日：1990-06-15
申请号：JP30982788
申请日：1988-12-09
Applicant: SONY CORP
Inventor： YAMAMOTO TETSUO , ISHIKAWA FUMIO , AOKI TAKAYUKI
IPC: H03K5/08 , H04B10/07 , H04B10/293 , H04B10/556 , H04B10/564 , H04B10/572 , H04L25/03
Abstract: PURPOSE:To make the pulse width of an output pulse signal outputted from a comparator stable against a temperature fluctuation by making a relative level difference between the output voltage of an amplifier fed to the comparator and a comparison voltage outputted from a level shift circuit nearly constant against a temperature change. CONSTITUTION:With a prescribed minute signal inputted to a photodetector 1, an output voltage appears at the output of an amplifier 2. When ambient temperature rises, an output voltage EO2 is lowered. On the other hand, a current I0 flowing to the collector of a constant current source transistor(TR) Q1 is increased. As a result, a change in a voltage outputted from a level shift circuit 5 is coincident with a temperature change and a level difference between both is nearly constant against the temperature fluctuation. Thus, the pulse width of an output pulse signal outputted from the output terminal 3 out of the comparator 3 is made stable against the temperature fluctuation.
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公开(公告)号：JPH0937134A
公开(公告)日：1997-02-07
申请号：JP18571795
申请日：1995-07-21
Applicant: SONY CORP
Inventor： ISHIKAWA FUMIO
IPC: H04N5/232
Abstract: PROBLEM TO BE SOLVED: To simplify configuration and to efficiently transmit an output to a coaxial transmission cable without expanding a shape by directly mixing 1st and 2nd signals, etc., when multiplexing those signals. SOLUTION: At transmission/reception equipment 10 on the side of a camera, digital video signals in R, G and B from a TV camera are sent to a QAM modulator 11 and modulated by 64QAM quadrature amplitude modulation. That output is passed through a buffer amplifier 12 and further sent through a resistor R10 to a multivibrator 20. At this multivibrator 20, the modulated video signals are directly mixed with other signals, frequency-multiplexed and outputted. This multiplex signal is passed through an LPF 21 and transmitted through a TRIAX cable 30 to transmission/reception equipment 40 on the side of a camera control unit. This transmitted multiplex signal is sent through an LPF 41 on the side of the control unit to a multivibrator 42. The multivibrator 42 outputs a signal to be modulated from a terminal Xef and sends it through a resistor R40 and a buffer amplifier 43 to a QAM demodulator 47 and the video signal is demodulated and sent to camera control equipment 60.
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公开(公告)号：JP2508501B2
公开(公告)日：1996-06-19
申请号：JP12330484
申请日：1984-06-15
Applicant: SONY CORP
Inventor： MAEKAWA TOSHIICHI , ISHIKAWA FUMIO
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公开(公告)号：JPH0786758A
公开(公告)日：1995-03-31
申请号：JP25109493
申请日：1993-09-13
Applicant: SONY CORP
Inventor： ISHIKAWA FUMIO
Abstract: PURPOSE:To provide a multilayered printed board pattern suitable for connection with a high frequency connector wherein obstruction to another block and signal transmission loss can be minimized and there is no influence of the shape of the GND pattern between other blocks. CONSTITUTION:The peripheral board of center conductor of the upper surface of GND of a high frequency connector 36 is eliminated, and through hole machining is performed on the side surface. The GND part of a multilayered board 10 and the GND part of the high frequency connector 36 are mutually connected via a through hole or the like just under the connector 36, and electric current flow of the GND Line 30 of the surface layer of the printed board 10 is made shortest. Thereby the leak of high frequency electric current is reduced.
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公开(公告)号：JPH06112866A
公开(公告)日：1994-04-22
申请号：JP28227892
申请日：1992-09-29
Applicant: SONY CORP
Inventor： ISHIKAWA FUMIO
Abstract: PURPOSE:To select the transmission reception at low cost by improving the reliability of on/off for a video band. CONSTITUTION:When a signal is sent, a 1st semiconductor switch IC1 is conductive and a 2nd semiconductor switch IC2 is connected to connect a noninverting input of a negative feedback operational amplifier IC3 for transmission signal amplification and an outer conductor of a coaxial cable K to ground. Conversely, when the signal is received, the 1st semiconductor switch IC1 is nonconductive and the 2nd semiconductor switch IC2 is not connected to float the noninverting input of the negative feedback operational amplifier IC3 and the outer conductor of the coaxial cable from ground to keep the input of the negative feedback operational amplifier open.
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Patent Agency Ranking
公开(公告)号：JPH0514229A
公开(公告)日：1993-01-22
申请号：JP19094191
申请日：1991-07-04
Applicant: SONY CORP
Inventor： KITAZONO SHINICHI , ISHIKAWA FUMIO
Abstract: PURPOSE:To prevent a starting drift, cross modulation characteristic, or beat characteristic or the like from being deteriorated due to the heat generation of an IF amplifier, or the sneaking of the disturbing wave of an oscillator signal and a mixer input or the like. CONSTITUTION:The first integrated circuit IC1 is equipped with a double balance type mixer circuit 2 which mixes an input RF signal SRF applied from a tuning circuit 12 at the previous stage with a local oscillation signal SV, and generates the signal of the frequency of a difference between those signals SRF and SV as an intermediate frequency signal SM, and an IF amplifier 3 which amplifies the intermediate frequency signal SM. And also, the second integrated circuit IC2 is equipped with an oscillator 4 which pours the local oscillation signal SV to the double balance type mixer circuit 2 provided at the first integrated circuit IC1, and a PLL circuit 5 which controls the oscillation frequency of the oscillator 4, and tunes the input signal. Thus, a frequency converting part 1 is constituted of the above mentioned two integrated circuits.
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公开(公告)号：JPH04220092A
公开(公告)日：1992-08-11
申请号：JP41234190
申请日：1990-12-19
Applicant: SONY CORP
Inventor： ISHIKAWA FUMIO , KITAZONO SHINICHI
Abstract: PURPOSE:To attain stable oscillation over a wide band and to extend the oscillating frequency ratio by controlling a capacitance of a circuit positively feeding back a resonance output to an oscillation amplifier as required. CONSTITUTION:Part of an output of a resonance circuit 1 is fed back positively to an oscillation amplifier 13 via a feedback circuit 9. Plural (e.g. 2) variable capacitors 2,3 are connected in series in the circuit 9, the capacitance of the circuit 9 is varied remarkably over a wide band, and the capacitance is selected small when the resonance frequency is high and the capacitance is selected large when the resonance frequency is low. Thus, stable oscillation is attained over a wide band and the oscillation frequency ratio is increased, and e.g. three- band configuration is used as 2-band configuration.
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公开(公告)号：JPH03204286A
公开(公告)日：1991-09-05
申请号：JP34389089
申请日：1989-12-29
Applicant: SONY CORP
Inventor： TANABE SHINICHI , ISHIKAWA FUMIO
Abstract: PURPOSE:To attain miniaturization by constituting the entire circuit with a one-chip IC for an FM modulator receiving an audio signal, an AM modulator receiving an FM modulated output and a video signal, an audio subcarrier signal oscillator and a main carrier signal oscillator, constituting both the oscillators with a VCO of a PLL circuit respectively. CONSTITUTION:A main carrier signal is AM-modulated by an FM-modulated output resulting from FM-modulating an audio subcarrier signal with an audio signal and a video signal and the AM-modulated output is used to vary a frequency division ratio of a variable frequency divider of a 1st PLL circuit 15 to obtain a desired channel frequency signal. Moreover, a frequency of an audio subcarrier signal is varied by varying the frequency division ratio of the other variable frequency divider of a 2nd PLL circuit 23. Thus, the FM modulator 22, the AM modulator 25 and the 1st and 2nd PLL circuits 15, 23 are constituted by one-chip IC. Then miniaturization is attained and the frequency of the main carrier signal and the audio subcarrier signal is made stable against temperature change.
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公开(公告)号：JPH02151118A
公开(公告)日：1990-06-11
申请号：JP30395588
申请日：1988-12-02
Applicant: SONY CORP
Inventor： YAMAMOTO TETSUO , ISHIKAWA FUMIO , AOKI TAKAYUKI
IPC: H03K5/08 , H04B10/07 , H04B10/556 , H04B10/80 , H04L25/03
Abstract: PURPOSE:To stably reproduce a square wave pulse signal even if the amplitude of an input pulse signal is small by using one of outputs of a differential amplifier as a reference signal, comparing the other output with the one output at the 1st comparator and generating a square pulse signal. CONSTITUTION:A 1st output signal Sa in opposite phase to an input pulse signal Si and a 2nd output signal in phase to the signal Si are fed respectively to an inverting input terminal and a noninverting input terminal of a 1st comparator 12. Moreover, a peak level of a 2nd output signal Sb of a differential amplifier 11 is nearly coincident with the operating voltage Vref of a 1st transistor(TR) 11b by the feedback operation of a peak hold circuit 13, a 2nd comparator 15 and a variable corrent source. Thus, the comparator 12 compares the 2nd output signal Sb used as a reference signal with the 1st output signal Sa to generate a square wave pulse signal So. Then even if the level of an optical input signal is small, the square wave pulse signal So is stably reproduced.
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公开(公告)号：JPH0253304A
公开(公告)日：1990-02-22
申请号：JP20387688
申请日：1988-08-18
Applicant: SONY CORP
Inventor： KITAZONO SHINICHI , ISHIKAWA FUMIO
Abstract: PURPOSE:To vary the frequency of plural oscillation signals by constituting each of N-stage of phase shift circuits by a differential amplifier and a CR time constant circuit respectively and providing an output terminal outputting plural oscillation signals with different phase to plural stages of the N-stage of differential amplifiers. CONSTITUTION:A 1st phase shift circuit 10 consists of a 1st differential amplifier 14 comprising transistors(TRs) Q1, Q2 and a constant current source 13 and of a 1st time constant circuit 15 comprising a resistor R1(R2) and a capacitor C1. A 2nd phase shift circuit 11 consists of a 2nd differential amplifier 18 comprising TRs Q3, Q4 and a constant current source 17 and of a 2nd time constant circuit 19 comprising a resistor R3 (R4) and a capacitor C2. The 3rd phase shift circuit 12 consists of a 3rd differential amplifier 21 comprising TRs Q5, Q6 and a constant current source 20 and of a 3rd time constant circuit 22 comprising a resistor R5 (R6) and a capacitor C3. Thus, plural oscillation signals with different phase are outputted from output terminals provided to the differential amplifiers 14, 18, 21.
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