公开(公告)号：US5495166A

公开(公告)日：1996-02-27

申请号：US45465

申请日：1993-04-08

Applicant: Roberto Alini ,  Andrea Baschirotto ,  Rinaldo Castello ,  Salvatore Portaluri

Inventor： Roberto Alini ,  Andrea Baschirotto ,  Rinaldo Castello ,  Salvatore Portaluri

IPC: H03F1/30 ,  G05F3/24 ,  H03K17/14 ,  G05F3/16

CPC classification number: G05F3/24 ,  H03K17/145

Abstract: A threshold voltage generator for a field-effect transistor, being of a type adapted to compensate for variations of the threshold voltage from a nominal value, comprising a first amplifier having a first input connected to a current generator; a second amplifier connected ahead of a second input of the first amplifier and having an input connected to another current generator; and a third amplifier connected after the first amplifier and having an output adapted to produce the value of said threshold voltage.

Abstract translation: 一种用于场效应晶体管的阈值电压发生器，其类型适于补偿阈值电压与标称值的变化，包括具有连接到电流发生器的第一输入的第一放大器; 连接在第一放大器的第二输入端的第二放大器，并具有连接到另一电流发生器的输入端; 以及连接在所述第一放大器之后并具有适于产生所述阈值电压值的输出端的第三放大器。

公开(公告)号：US5485074A

公开(公告)日：1996-01-16

申请号：US112850

申请日：1993-08-26

Applicant: Luciano Tomasini ,  Rinaldo Castello

Inventor： Luciano Tomasini ,  Rinaldo Castello

IPC: H03F3/343 ,  G05F3/26 ,  G05F3/16

CPC classification number: G05F3/26

Abstract: The PSRR (power supply rejection ratio) of a current mirror circuit is increased by cascoding the output transistor of the current mirror, and the precision of the circuit is enhanced by employing a frequency compensated gain stage utilizing a field effect transistor to drive a bipolar current output transistor.

Abstract translation: 电流镜电路的PSRR（电源抑制比）通过级联电流镜的输出晶体管而增加，并且通过采用利用场效应晶体管来驱动双极电流的频率补偿增益级来增强电路的精度 输出晶体管。

公开(公告)号：US5459787A

公开(公告)日：1995-10-17

申请号：US95752

申请日：1993-07-21

Applicant: Luciano Tomasini ,  Rinaldo Castello ,  Pietro Erratico

Inventor： Luciano Tomasini ,  Rinaldo Castello ,  Pietro Erratico

IPC: H04B1/58 ,  H04M1/58 ,  H04M1/76

CPC classification number: H04M1/585 ,  H04B1/586 ,  H04M1/76

Abstract: A circuit for synthesizing an impedance associated with a telephone subscriber's circuit connected to a two-wire telephone line is described. The circuit of the invention is adapted to synthesize a complex impedance which can function both as a termination impedance and a balance impedance. The termination impedance utilizes a positive feedback loop structure having a loop gain which is at all times less than unity. The circuit that implements both the termination and balance impedances with sidetone suppression is also described. Each of the embodiments is realizable with a single external component consisting of a resistor.

Abstract translation: 描述用于合成与连接到两线电话线路的电话用户电路相关联的阻抗的电路。 本发明的电路适于合成可以起到终端阻抗和平衡阻抗的复阻抗。 终端阻抗利用正反馈环路结构，其具有始终小于1的环路增益。 还描述了同时实现端接抑制和平衡阻抗的电路。 每个实施例都可以由一个由电阻组成的单个外部元件来实现。

公开(公告)号：US4926138A

公开(公告)日：1990-05-15

申请号：US375771

申请日：1989-07-05

Applicant: Rinaldo Castello ,  Marco Ferro ,  Franco Salerno ,  Lucano Tomasini

Inventor： Rinaldo Castello ,  Marco Ferro ,  Franco Salerno ,  Lucano Tomasini

IPC: G05F3/24 ,  G05F3/20 ,  G05F3/30 ,  H03F3/343 ,  H03K17/60

CPC classification number: G05F3/30 ,  G05F3/20

Abstract: The source is apt to generate a fully-differential reference voltage at the output terminals, whereto precisely-balanced loads are applied. The voltage reference is obtained from a bandgap voltage source fed with currents proportional to the temperature, in order to minimize thermal voltage variations. Suitable circuits for starting the normal source operation after switching on are also provided.