公开(公告)号：US20180004241A1

公开(公告)日：2018-01-04

申请号：US15702917

申请日：2017-09-13

Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd

Inventor： Meng Wang ,  Xue Lian Zhou

IPC: G05F3/26 ,  H02M1/08 ,  H02M3/158 ,  H02M1/00

CPC classification number: G05F3/262 ,  H02M1/08 ,  H02M3/158 ,  H02M2001/0032 ,  Y02B70/16

Abstract: An electronic device includes a current comparator to generate an output current based upon a difference between a current flowing in an output branch and a current flowing in an input branch. A pair of transistors is coupled to an output of the current comparator. A first amplifier has inputs coupled to the pair of transistors and to a reference voltage, the first amplifier being configured to subtract the reference voltage from a voltage across the pair of transistors and output a difference voltage. A second amplifier has inputs coupled to the difference voltage and to the reference voltage, the second amplifier being configured to subtract the difference voltage from the reference voltage and output a pulse skipping mode reference signal.

公开(公告)号：US09323273B2

公开(公告)日：2016-04-26

申请号：US14504494

申请日：2014-10-02

Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd

Inventor： Meng Wang ,  Xue Lian Zhou

IPC: H05B37/02 ,  G05F3/26 ,  H05B33/08

CPC classification number: G05F3/262 ,  H03M1/745 ,  H05B33/0809 ,  H05B33/0815

Abstract: A current source circuit is configured to receive a reference current at the input circuit path of a current mirror circuit. The current mirror circuit mirrors the reference current and generates mirror currents at a number of output circuit paths. A corresponding number of control transistors are connected in series with the output circuit paths. Each control transistor is selectively actuated in response to a control signal. A decoder circuit is configured to receive a variable control signal and generate actuation signals in response thereto to selective actuate the control transistors to pass the mirror current to an output node. At the output node, the passed mirror currents are summed to generate a variable output current. The variable current is monotonically modulated in response to the variable control signal.

Abstract translation: 电流源电路被配置为在电流镜电路的输入电路路径处接收参考电流。 电流镜电路反映参考电流并在多个输出电路路径上产生镜像电流。 相应数量的控制晶体管与输出电路路径串联连接。 每个控制晶体管响应于控制信号被选择性地致动。 解码器电路被配置为接收可变控制信号并响应于此产生致动信号以选择性地致动控制晶体管以将镜电流传递到输出节点。 在输出节点，将通过的镜像电流相加以产生可变输出电流。 可变电流响应于可变控制信号被单调调制。