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    • 6. 发明授权
    • Phase regulation circuit, particularly for horizontal phase regulation
in data displays
    • 相位调节电路,特别适用于数据显示中的水平相位调节
    • US4837464A
    • 1989-06-06
    • US55954
    • 1987-06-01
    • Roberto ViscardiSilvano GornatiSilvano Coccetti
    • Roberto ViscardiSilvano GornatiSilvano Coccetti
    • H03K5/26G09G5/12G09G5/18H03K4/90H03K5/13H03L7/06
    • G09G5/12
    • This circuit comprises a phase-lock stage receiving at the input a reference signal and the synchronism signal EN and generating at the output a triangular signal in phase correlation with the synchronism signal, a rectangular waveform generator receiving at the input the triangular signal and supplying at the output a rectangular signal, a drive element receiving the rectangular signal and generating a periodic control signal, as well as a phase comparator receiving at the input the triangular signal and the control signal, as well as a further reference signal and generating at the output an error signal correlated with the phase shift of the drive element and fed to the rectangular waveform generator. The reference signal fed to the phase-lock stage or to the phase comparator can be suitably varied within preset limits by an external potentiometer.
    • 该电路包括相位锁定级,在输入端接收参考信号和同步信号EN,并在输出端产生与同步信号相位相关的三角形信号;矩形波形发生器,在输入端接收三角形信号并在 输出矩形信号,接收矩形信号并产生周期性控制信号的驱动元件以及在输入端接收三角波信号和控制信号的相位比较器以及另一参考信号并在输出端产生 与驱动元件的相移相关并馈送到矩形波形发生器的误差信号。 馈送到锁相级或相位比较器的参考信号可以通过外部电位器在预设的限制内适当变化。
    • 8. 发明授权
    • RC oscillator having plural differential threshold stages
    • RC振荡器具有多个差分阈值级
    • US4672332A
    • 1987-06-09
    • US854392
    • 1986-04-21
    • Silvano CoccettiRoberto ViscardiSilvano Gornati
    • Silvano CoccettiRoberto ViscardiSilvano Gornati
    • H03K3/0231H03K4/502H03K3/023H03K3/282
    • H03K3/0231H03K4/502
    • This high accuracy, RC oscillator, particularly for monitors, has different switch-over thresholds independent from such variable parameters as the saturating voltage of transistors, and has a high operating frequency. The oscillator comprises a capacitor having an output terminal, a capacitor power current source, and a control section. The control section is composed of a plurality of differential stages sharing a common input and each having an input connected to a different switch-over threshold. The control section further comprises a switch-over drive stage connected to the oscillator output terminal and to an input terminal thereof for controlling activation and deactivation of the different differential stages (and hence, of the respective associated thresholds) according to the signal present at the output and input terminals of the oscillator.
    • 这种高精度RC振荡器,特别是对于监视器,具有独立于诸如晶体管的饱和电压的可变参数的不同的切换阈值,并且具有高的工作频率。 振荡器包括具有输出端子的电容器,电容器功率电流源和控制部分。 控制部分由多个共用公共输入的差分级组成,每个具有连接到不同转换阈值的输入。 控制部分还包括连接到振荡器输出端及其输入端的切换驱动级,用于根据存在于所述振荡器输出端的信号控制不同差分级(并且因此相应的相应阈值)的激活和去激活 输出和输入端子。
    • 9. 发明授权
    • Power amplifier protection circuit
    • 功率放大器保护电路
    • US4417292A
    • 1983-11-22
    • US377994
    • 1982-05-13
    • Valerio BorghesePietro ErraticoSilvano Coccetti
    • Valerio BorghesePietro ErraticoSilvano Coccetti
    • H03F1/52H03K4/08H03K4/69H03K17/082H02H3/26H03F3/04
    • H03K17/0826H03F1/52H03K4/085H03K4/693
    • A protective current mirror, with a reflection ratio greater than one, is connected as the active load of an input differential amplifier of a power amplifier. This mirror is provided in addition to the usual current mirror which has its output connected to the drive transistor of the output power amplifier stage. The protective mirror senses the imbalance due to a voltage peak which occurs at an inverted input of the input differential amplifier at the very beginning of the descending portion of a sawtooth input signal ramp voltage and the protective mirror operates a protective transistor which is connected to the base of the power amplifier drive transistor so as to keep one power transistor of the final power amplifier stage in its inactive state. Protection of the output power transistor occurs before the output of the power amplifier has reached its maximum voltage level.
    • 反射比大于1的保护电流镜被连接作为功率放大器的输入差分放大器的有源负载。 除了通常的电流反射镜之外还提供该反射镜,该反射镜的输出端连接到输出功率放大器级的驱动晶体管。 保护镜感测到由于在锯齿波输入信号斜坡电压的下降部分的最初开始在输入差分放大器的反相输入处发生的电压峰值的不平衡,并且保护镜操作保护晶体管,其连接到 功率放大器驱动晶体管的基极,以将最终功率放大器级的一个功率晶体管保持在其非激活状态。 输出功率晶体管的保护发生在功率放大器的输出达到其最大电压电平之前。