公开(公告)号：US4028505A

公开(公告)日：1977-06-07

申请号：US619905

申请日：1975-10-06

Applicant: Lorenzo Fassino

Inventor： Lorenzo Fassino

IPC: H03H11/44 ,  H04B3/16 ,  H04B3/36

CPC classification number: H03H11/44 ,  H04B3/16

Abstract: A negative impedance repeater for amplification in telephone lines operating at voice frequency comprises two converters, one of them stable with open terminals and the other stable with short-circuited terminals; each converter is loaded by a fixed network of passive impedances chosen according to the characteristic impedance of the line to be amplified, and provided with means, external to the network of passive impedances, for adjusting the feedback, and consequently the conversion ratio. The conversion ratios of the two converters may be varied independently from each other so that in the case of loaded lines their product may be kept always constant and this allows to adjust the repeater gain without modifying its impedance, while for unloaded lines it is possible to obtain that such product increases with a certain law by increasing gain, and this fact causes an equalization at the highest frequencies of the band, which is necessary for this type of lines.

Abstract translation: 用于在语音频率下工作的电话线路中用于放大的负阻抗中继器包括两个转换器，其中一个稳定，具有开路端子，另一个稳定的具有短路端子; 每个转换器由根据要放大的线路的特性阻抗选择的无源阻抗的固定网络加载，并且在被动阻抗网络外部提供用于调整反馈的装置，从而提供转换比。 两个转换器的转换比可以彼此独立地变化，使得在负载线路的情况下，它们的乘积可以保持总是恒定的，并且这允许调整中继器增益而不修改其阻抗，而对于无负载线路，可以 通过增加增益获得这种产品通过某种规律增加，并且这个事实导致频带的最高频率的均衡，这对于这种类型的线路是必需的。

公开(公告)号：US4485356A

公开(公告)日：1984-11-27

申请号：US385067

申请日：1982-06-04

Applicant: Lorenzo Fassino

Inventor： Lorenzo Fassino

IPC: H03B1/00 ,  H03B5/20 ,  H03H11/48 ,  H03B5/26

CPC classification number: H03B5/20 ,  H03H11/485 ,  H03B2200/0034 ,  H03B2200/0066 ,  H03B2201/01

Abstract: A low frequency sinusoidal oscillator, comprises a circuit which contains operational amplifiers, resistors and capacitors and has no inductor. The circuit, however, operates as an inductor. The circuit is arranged to resonate at a frequency which may be chosen by acting on only one component which preferably is a resistive component.

Abstract translation: 低频正弦振荡器包括一个包含运算放大器，电阻和电容器并且没有电感的电路。 然而，该电路用作电感器。 电路被布置成以可以通过仅作用于优选为电阻部件的一个部件来选择的频率进行谐振。