公开(公告)号：US20040041600A1

公开(公告)日：2004-03-04

申请号：US10649711

申请日：2003-08-26

Applicant: STMICROELECTRONICS S.A.

Inventor： Lionel Grillo

IPC: H03B001/00

CPC classification number: H03L7/099 ,  H03B5/24 ,  H03B28/00 ,  H03L7/0891

Abstract: A sinusoidal frequency generator comprising an oscillation circuit controlled by a control voltage, characterized in that the oscillating circuit is a gyrator made up of two transconductance amplifiers whose bias points are fixed by the control voltage in order to regulate oscillation frequency. The gyrator is easy to integrated in a phase control loop in order to realize a square-to-sinusoidal frequency converter.

公开(公告)号：US20030174249A1

公开(公告)日：2003-09-18

申请号：US10356350

申请日：2003-01-30

Applicant: STMicroelectronics S.A.

Inventor： Lionel Grillo

IPC: H03M001/12

CPC classification number: H03M1/1295 ,  H04N5/18

Abstract: A calibration device for a video circuit input stage comprises an analog-to-digital converter and an input capacitor constantly discharged by a power source and recharged by a charging circuit by means of a first and a second charging current. The charging circuit is controlled by a central processing unit receiving an estimate of the variation between the converter's output code and a clamp value.

Abstract translation: 用于视频电路输入级的校准装置包括模数转换器和由电源恒定放电并由充电电路借助于第一和第二充电电流再充电的输入电容器。 充电电路由接收对转换器的输出代码和钳位值之间的变化的估计的中央处理单元控制。

公开(公告)号：US20040041630A1

公开(公告)日：2004-03-04

申请号：US10649998

申请日：2003-08-26

Applicant: STMICROELECTRONICS S.A.

Inventor： Lionel Grillo

IPC: H03F003/45

CPC classification number: H03H11/1213 ,  H03G1/0023 ,  H03H11/1291

Abstract: A low-pass filter with a variable gain comprising a transconductance differential amplifier stage comprising a differential input and a differential output, the latter receiving a passive circuit, such as a first-order RC filter, in order to realize low-pass filtering of the amplifier stage. The filter is chosen so that the cut-off frequency is below the frequency range to be treated. The filter further comprises a control element controlling the differential amplifier stage's bias point to allow control of the gain associated to filtering. Thus, low-pass filtering associated to a variable gain can be realized in a very simple way. The circuit is perfectly adapted for incorporation into a semiconductor product.

Abstract translation: 具有可变增益的低通滤波器包括跨导差分放大器级，其包括差分输入和差分输出，后者接收诸如一阶RC滤波器的无源电路，以便实现低通滤波 放大器级。 选择滤波器，使得截止频率低于待处理的频率范围。 滤波器还包括控制元件，控制差分放大器级的偏置点以允许控制与滤波有关的增益。 因此，可以以非常简单的方式实现与可变增益相关联的低通滤波。 该电路非常适合并入半导体产品。