公开(公告)号：US20150043663A1

公开(公告)日：2015-02-12

申请号：US14489650

申请日：2014-09-18

Applicant: Renesas Electronics Corporation

Inventor： Yoshiaki ISHIZEKI

IPC: H04L25/03 ,  H03K17/16 ,  H04L1/20

CPC classification number: H04L25/03885 ,  H03K17/16 ,  H03K17/166 ,  H03K19/00361 ,  H03K19/017545 ,  H03K19/018507 ,  H03K19/018521 ,  H04L1/20

Abstract: A serial communication apparatus includes a slew rate control circuit, an output circuit, a detection circuit, and a switching circuit. The slew rate control circuit has a predetermined impedance, and supplies a constant current from an output according to an input signal. In the output circuit, first capacitance is charged and discharged by the constant current from the slew rate control circuit. The output circuit outputs a digital signal from an output terminal according to a drive voltage. The noise detection circuit detects noise propagated from the output terminal, and outputs a switching signal according to a detection result. The switching circuit switches an impedance of the slew rate control circuit to a value smaller than the predetermined impedance according to the switching signal.

Abstract translation: 串行通信装置包括压摆率控制电路，输出电路，检测电路和开关电路。 压摆率控制电路具有预定的阻抗，并根据输入信号从输出端提供恒定电流。 在输出电路中，第一电容通过来自压摆率控制电路的恒定电流进行充放电。 输出电路根据驱动电压从输出端子输出数字信号。 噪声检测电路检测从输出端子传播的噪声，并根据检测结果输出切换信号。 开关电路根据开关信号将压摆率控制电路的阻抗切换到小于预定阻抗的值。

公开(公告)号：US20250147079A1

公开(公告)日：2025-05-08

申请号：US18883388

申请日：2024-09-12

Applicant: Renesas Electronics Corporation

Inventor： Yoshiaki ISHIZEKI ,  Makoto TANAKA

IPC: G01R19/165

Abstract: A current sense circuit is provided. The circuit includes a current mirror circuit QN1, QN2, and diode-connected QP1, QP2, QP3, and QP4 with their bases connected together, stacking such that the diode-connected side (QN1, QP1, QP3) aligns and connecting the emitter of QP2 to the collector of QP4. Furthermore, the gates of MP1 and MP2 are connected to the collector of QN2 and QP2, respectively. Additionally, the source of MP1 is connected to the drain of MP3 via the source of MP2 and also connected to the source of a Sense MOS. Moreover, the emitter of QP4 is connected to the source of MP4 via R1, and the drain of MP4 is connected to the source (OUT terminal) of a Main MOS. Furthermore, the gates of MP3 and MP4 are connected to the emitters of QN1 and QN2.