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    • 82. 发明专利
    • Signal deciding and switching circuit
    • 信号决定和切换电路
    • JPS5737927A
    • 1982-03-02
    • JP11215080
    • 1980-08-13
    • Matsushita Electric Ind Co Ltd
    • TAKUHARA SADAHIROKAWASHIMA KAZUMIFUJITA MASAAKI
    • H03J7/00G06F19/00H03J7/18H03K17/60H03K17/62H03K19/173H04B3/00
    • H03K19/1732
    • PURPOSE:To decrease the number of pins of an integrated circuit, by transferring the signal between the digital and analog integrated circuits via a two-way signal line. CONSTITUTION:When a digital input signal (d) of a terminal 14 of a digital integrated circuit 1 is at L level, a signal output circuit is turned on. Then a signal (e') of an input/output terminal 27 is set at H level. An input signal deciding circuit 12 is turned on, and an output signal (c') of a terminal 13 is set at L level. An output (f') of a voltage comparator 32 is set at H level since the H-level signal (e') of an input/ output terminal 30 of an analog integrated circuit 2 is set higher than the comparison voltage (m) of the comparator 32. Then a signal (g) equal to an analog input signal (a) of the terminal 3 is delivered via signal changeover circuits 20 and 23. When the signal (d) is set at H level, the circuit 15 is turned off. Then the output voltage of an impedance converter 31 of a voltage comparator 5 is applied to the comparator 32. This voltage is lower than the voltage (m), so the signal (f') of the comparator 32 is set at L level to deliver the DC voltage (g) of a certain level to the terminal 24. At the same time, a signal (c') having the same waveform as the output voltage of the converter is delivered to the terminal 13 via the circuit 12.
    • 目的:通过双向信号线在数字和模拟集成电路之间传输信号,减少集成电路的引脚数。 构成:当数字集成电路1的端子14的数字输入信号(d)处于L电平时,信号输出电路导通。 然后,输入/输出端子27的信号(e')被设置为H电平。 输入信号判定电路12导通,端子13的输出信号(c')设定为L电平。 由于模拟集成电路2的输入输出端子30的H电平信号(e')被设定为高于模拟集成电路2的比较电压(m),所以将电压比较器32的输出(f')设定为H电平 比较器32.然后,经由信号切换电路20和23传送等于端子3的模拟输入信号(a)的信号(g)。当信号(d)被设置为H电平时,电路15转动 关闭 然后将电压比较器5的阻抗转换器31的输出电压施加到比较器32上。该电压低于电压(m),因此比较器32的信号(f')设定为L电平以传送 与端子24的一定电平的直流电压(g)。同时,具有与转换器的输出电压相同波形的信号(c')经由电路12被传送到端子13。
    • 84. 发明专利
    • VOLTAGE COMPARATOR
    • JPS56116321A
    • 1981-09-12
    • JP2026380
    • 1980-02-19
    • MATSUSHITA ELECTRIC IND CO LTD
    • KAWASHIMA KAZUMIUEDA MINORUTAKUHARA SADAHIROYAMAMOTO HIROSUKE
    • H03J5/02H03J3/18
    • PURPOSE:To reject flicker phenomenon, by inputting compared voltage through common connection of one input of two voltage comparison circuits of a channel selector of a TV receiver and connecting another input to the both ends of a resistance for comparison through given comparison voltage. CONSTITUTION:The neutral point voltage of a preset variable resistor 21 is applied to the base of a transistor TR29 connected to a constant current circuit 28, the emitter of TR29 is connected to the base of TR30, temperature compensation is made at TR30, and the voltage is applied to a constant current circuit 32 via a resistance 31. The both ends of the resistance 31 are respectively connected to the (-) terminal of voltage comparison circuits 33, 34, the (+) terminals of the circuits 33, 34 are connected in common and a voltage VRef to be compared is applied to it. The output of the circuits 33, 34 is connected to the base of switching TRs 43, 49 of opposite polarity via a resistance, and the collector of the TRs 43, 39 are connected to the output terminal 27 respectively bia resistance 40, 41. Taking the voltage between the (-) terminal and ground of the circuits 33, 34, as VR1, VR2 respectively, TRs 39, 43 are off when VR2
    • 86. 发明专利
    • CHANNEL SELECTION UNIT
    • JPS55165021A
    • 1980-12-23
    • JP7272379
    • 1979-06-08
    • MATSUSHITA ELECTRIC IND CO LTD
    • KAWASHIMA KAZUMIUEDA MINORUTAKUHARA SADAHIROYAMAMOTO HIROSUKE
    • H03J5/02
    • PURPOSE:To prevent the channel selection at detuning state, by adding the tuning voltage information from the microcomputer muCM and the clock pulse to the D/A conversion circuit and adding the clock pulse to muCM as driving clock after frequency division. CONSTITUTION:The tuning voltage information from the muCM39 is fed to the D/A converter 41, and the clock pulse from the oscillator 49 is fed to the converter 41. The converter 41 coverts the tuning voltage information into the pulse train having the pulse width information according to the tuning voltage, based on the clock pulse to add it to the LPF45, and the output is fed to the varactor diode of the tuner 46 for channel selection. In this case, the clock pulse from the oscillator 49 is frequency-divided at the variable frequency divider 51 and it is fed to the muCM39 as driving clock. Thus, the repetitive frequency of the clock pulse of the converter 41 is taken greater than the clock repetitive frequency of the muCM39 and the time constant of LPF45 can be decreased without increasing the ripple component of the output, allowing the unit to prevent from being entered into channel selection at detuning state.