公开(公告)号：US08643524B1

公开(公告)日：2014-02-04

申请号：US13628855

申请日：2012-09-27

Applicant: Cirrus Logic, Inc.

Inventor： Ramin Zanbaghi

IPC: H03M3/00

CPC classification number: H03M3/322 ,  H03M3/452 ,  H03M3/474

Abstract: An analog-to-digital converter (ADC) having a reduced number of amplifiers and feed-forward signal paths provides for reduced complexity and power consumption. The analog-to-digital converter includes a delta-sigma modulator having a loop filter with second-order stages implemented with a single amplifier each, provided by a series-connected capacitive feedback network with a switched capacitor shunt. The reduction in the amplifier stages reduces the number of inputs to, and dynamic range required from, the summing node that provides input to the quantizer, as well as reducing the power requirements and complexity of the circuit due to the reduced number of amplifiers.

Abstract translation: 具有减少数量的放大器和前馈信号路径的模数转换器（ADC）提供降低的复杂性和功耗。 模数转换器包括具有环路滤波器的Δ-Σ调制器，该环路滤波器具有由单个放大器实现的二阶级，每个放大器由具有开关电容器分流的串联电容反馈网络提供。 放大器级的减少将向量化器提供输入的求和节点的输入数量和动态范围减少，并且由于减少的放大器数量而减少电路的功率需求和复杂性。

公开(公告)号：US10720888B2

公开(公告)日：2020-07-21

申请号：US15336995

申请日：2016-10-28

Applicant: Cirrus Logic, Inc.

Inventor： Ramin Zanbaghi ,  Aaron J. Brennan ,  John L. Melanson ,  Mikel Ash

IPC: H03F3/185 ,  H03F3/217 ,  H03K7/08 ,  H03F1/02 ,  H03F1/30

Abstract: An integrated circuit may have two signal paths: an open-loop modulator (which may comprise a digital-input Class-D amplifier) and a closed-loop modulator (which may comprise an analog-input Class-D amplifier). A control subsystem may be capable of selecting either of the open-loop modulator or the closed-loop modulator as a selected path based on one or more characteristics (e.g., signal magnitude) of an input audio signal. For example, for higher-magnitude signals, the closed-loop modulator may be selected while the open-loop modulator may be selected for lower-magnitude signals. In some instances, when the open-loop modulator is selected as the selected path, the closed-loop modulator may power off, which may reduce power consumption. In addition, one or more techniques may be applied to reduce or eliminate user-perceptible audio artifacts caused by switching between the open-loop modulator and the closed-loop modulator, and vice versa.

公开(公告)号：US09496855B2

公开(公告)日：2016-11-15

申请号：US14444087

申请日：2014-07-28

Applicant: Cirrus Logic, Inc.

Inventor： Siddharth Maru ,  John L. Melanson ,  Rahul Singh ,  Eric King ,  Thirumalai Rengachari ,  Ramin Zanbaghi ,  Arnab Kumar Dutta

IPC: H05B37/02 ,  H03K4/48 ,  H05B33/08

CPC classification number: H03K4/48 ,  H05B33/0815 ,  H05B37/02 ,  Y02B20/347

Abstract: A bipolar junction transistor (BJT) may be used in a power stage DC-to-DC converter, such as for LED-based light bulbs. The BJT may be switched on and off from a controller coupled to two terminals of the BJT. Through the two terminals, the control IC may dynamically adjust a reverse recovery time period of the BJT. The reverse recovery time period may be adjusted by changing an amount of base charge that accumulates on the BJT. Additional, the reverse recovery may be controlled through the use of a reverse base current source applied to the BJT after beginning switching off the BJT.

Abstract translation: 双极结型晶体管（BJT）可用于功率级DC-DC转换器，例如用于基于LED的灯泡。 BJT可以从耦合到BJT的两个端子的控制器接通和断开。 通过两个端子，控制IC可以动态地调整BJT的反向恢复时间段。 可以通过改变在BJT上积累的基本电荷的量来调整反向恢复时间段。 此外，可以通过在开始关闭BJT之后使用施加到BJT的反向基极电流源来控制反向恢复。

公开(公告)号：US09253833B2

公开(公告)日：2016-02-02

申请号：US14280474

申请日：2014-05-16

Applicant: Cirrus Logic, Inc.

Inventor： Ramin Zanbaghi ,  John L. Melanson ,  Jieyeon Choi

IPC: H05B37/02 ,  H05B33/08 ,  H02M3/158 ,  H02M1/00

CPC classification number: H05B33/0815 ,  H02M3/158 ,  H02M2001/0009 ,  H05B33/0845 ,  Y02B20/346

Abstract: A power stage for light emitting diode (LED)-based light bulbs may include a bipolar junction transistor (BJT). The base of BJT switch may be biased externally and the operation of the BJT may be through a single pin to the emitter of the BJT. A controller integrated circuit (IC) may control the power stage through the main BJT's emitter pin in an emitter-controlled BJT-based power stage. The emitter-controlled BJT-based power stage may replace the conventional buck-boost power stage topology. For example, the controller may activate and deactivate a switch coupling the BJT's emitter to ground. A power supply for the controller IC may be charged from a reverse recovery of charge from the BJT, and the reverse recovery controlled by the controller IC.

Abstract translation: 基于发光二极管（LED）的灯泡的功率级可以包括双极结型晶体管（BJT）。 BJT开关的基极可能被外部偏置，并且BJT的操作可能通过BJT的发射极的单个引脚。 控制器集成电路（IC）可以通过发射极控制的基于BJT的功率级中的主BJ​​T发射极引脚来控制功率级。 基于发射极控制的基于BJT的功率级可以取代传统的降压 - 升压功率级拓扑。 例如，控制器可以激活和去激活将BJT的发射极耦合到地的开关。 用于控制器IC的电源可以从BJT的反向恢复电荷和由控制器IC控制的反向恢复来充电。

公开(公告)号：US20150028768A1

公开(公告)日：2015-01-29

申请号：US14341984

申请日：2014-07-28

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Thirumalai Rengachari ,  Siddharth Maru ,  Ramin Zanbaghi ,  Firas Azrai ,  Rahul Singh

IPC: H05B33/08 ,  H02M3/156

CPC classification number: H05B33/0815 ,  H02M3/156 ,  H05B33/0845 ,  H05B37/02

Abstract: A turn-off transition time period, also referred to as a reverse recovery time period, may be compensated for by a controller of a power stage including a bipolar junction transistor (BJT). The reverse recovery time period may be measured in one switching cycle and a subsequent switching cycle may include compensations based on the measured reverse recovery time period. That is the switching on and off of the BJT may be compensated to obtain a desired average output current to a load. When the reverse recovery time period is known, an error in the peak current obtained due to the reverse recovery time period may be calculated. The calculated error may be used to offset the target peak current for controlling the switching of the BJT to begin a turn-off transition of the BJT earlier in a switching cycle and thus reduce error in peak current at the BJT.

Abstract translation: 还可以通过包括双极结型晶体管（BJT）的功率级的控制器补偿关断转换时间段（也称为反向恢复时间周期）。 可以在一个开关周期内测量反向恢复时间段，并且随后的开关周期可以包括基于所测量的反向恢复时间段的补偿。 也就是说，可以补偿BJT的接通和断开以获得期望的负载平均输出电流。 当已知反向恢复时间周期时，可以计算由于反向恢复时间段而获得的峰值电流的误差。 计算出的误差可用于偏移目标峰值电流，以控制BJT的开关，以便在开关周期中较早地开始BJT的关断转换，从而减小BJT的峰值电流误差。

公开(公告)号：US09609701B2

公开(公告)日：2017-03-28

申请号：US14634716

申请日：2015-02-27

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Ramin Zanbaghi ,  Thirumalai Rengachari ,  Prashanth Drakshapalli ,  Rahul Singh ,  Arnab Kumar Dutta

IPC: H05B37/02 ,  H05B33/08 ,  H02M3/335

CPC classification number: H05B33/0815 ,  H02M3/335 ,  H05B33/0845 ,  H05B33/0887 ,  H05B37/02

Abstract: A bipolar junction transistor (BJT) may be used in a power stage DC-to-DC converter, such as a converter in LED-based light bulbs. The power stage may be operated by a controller to maintain a desired current output to the LED load. The controller may operate the power stage by monitoring a start and end of a reverse recovery time of the BJT. Information regarding the start and end of the reverse recovery time may be used in the control of the power stage to improve efficiency of the power stage.

公开(公告)号：US20160118948A1

公开(公告)日：2016-04-28

申请号：US14524867

申请日：2014-10-27

Applicant: Cirrus Logic, Inc.

Inventor： Ramin Zanbaghi

IPC: H03F3/183 ,  H03F3/217 ,  H03F1/02

CPC classification number: H03F1/0277 ,  H03F1/305 ,  H03F3/185 ,  H03F3/2171 ,  H03F3/2175 ,  H03F2200/03 ,  H03F2200/129 ,  H03F2200/321 ,  H03F2200/324 ,  H03F2200/351 ,  H03F2200/432 ,  H03K7/08

Abstract: An integrated circuit may have two signal paths: an open-loop modulator (which may comprise a digital-input Class-D amplifier) and a closed-loop modulator (which may comprise an analog-input Class-D amplifier). A control subsystem may be capable of selecting either of the open-loop modulator or the closed-loop modulator as a selected path based on one or more characteristics (e.g., signal magnitude) of an input audio signal. For example, for higher-magnitude signals, the closed-loop modulator may be selected while the open-loop modulator may be selected for lower-magnitude signals. In some instances, when the open-loop modulator is selected as the selected path, the closed-loop modulator may power off, which may reduce power consumption. In addition, one or more techniques may be applied to reduce or eliminate user-perceptible audio artifacts caused by switching between the open-loop modulator and the closed-loop modulator, and vice versa.

Abstract translation: 集成电路可以具有两个信号路径：开环调制器（其可以包括数字输入D类放大器）和闭环调制器（其可以包括模拟输入D类放大器）。 控制子系统可以基于输入音频信号的一个或多个特性（例如，信号幅度）来选择开环调制器或闭环调制器中的任一个作为选择的路径。 例如，对于较高幅度的信号，可以选择闭环调制器，同时为低电平信号选择开环调制器。 在一些情况下，当选择开环调制器作为选择的路径时，闭环调制器可以断电，这可能降低功耗。 此外，可以应用一种或多种技术来减少或消除由开环调制器和闭环调制器之间的切换引起的用户可感知的音频伪像，反之亦然。

公开(公告)号：US09185767B2

公开(公告)日：2015-11-10

申请号：US14158445

申请日：2014-01-17

Applicant: Cirrus Logic, Inc.

Inventor： Ramin Zanbaghi ,  Arnab Kumar Dutta ,  Firas Azrai

IPC: H05B41/36 ,  H05B33/08 ,  H02M7/5383

CPC classification number: H05B33/0872 ,  H02M7/5383 ,  H05B33/0815 ,  H05B33/0866 ,  Y02B20/347 ,  Y02B70/1441

Abstract: A self-oscillating resonator (SOR) may be used to control current through light emitting diodes (LEDs). The SOR may be started and stopped by a controller coupled to a transistor switch in the SOR. The controller may output a control signal that starts and stops the SOR by coupling a supply voltage or a ground to a base of the transistor switch in the SOR. Additional control over the current output to the LEDs may be gained through a resistive DAC coupled to the SOR and duty cycling the SOR.

Abstract translation: 自振荡谐振器（SOR）可用于控制通过发光二极管（LED）的电流。 SOR可以由耦合到SOR中的晶体管开关的控制器启动和停止。 控制器可以通过在SOR中将电源电压或接地耦合到晶体管开关的基极来输出启动和停止SOR的控制信号。 可以通过耦合到SOR的电阻式DAC和SOR负载来获得对LED的电流输出的额外控制。

公开(公告)号：US20140339999A1

公开(公告)日：2014-11-20

申请号：US14280539

申请日：2014-05-16

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Ramin Zanbaghi ,  Jieyeon Choi ,  Firas Azrai ,  Rahul Singh ,  Siddharth Maru

IPC: H02M3/07 ,  H05B33/08

CPC classification number: H02M3/07 ,  H02M1/08 ,  H02M3/335 ,  H02M2001/0006 ,  H03K17/64 ,  H05B33/0815 ,  H05B33/0845

Abstract: A bipolar junction transistor (BJT) may be used to generate a supply voltage for operating a controller, such as a lighting controller for a LED-based light bulb. A base of the BJT may receive current generated from the supply voltage to control operation of the BJT. Although the base of the BJT would be at a lower voltage than the emitter, a base drive circuit may be coupled between the emitter and the base of the BJT to increase the voltage. As one example, the base drive circuit may be a charge pump. In another example, the BJT may function as its own charge pump. In yet another example, a positive and a negative base current of the BJT may be independently controlled to regulate an output supply voltage VDD from the BJT.

Abstract translation: 可以使用双极结型晶体管（BJT）来产生用于操作诸如用于基于LED的灯泡的照明控制器的控制器的电源电压。 BJT的基座可以接收从电源电压产生的电流，以控制BJT的工作。 虽然BJT的基极处于比发射极更低的电压，但是基极驱动电路可以耦合在发射极和BJT的基极之间以增加电压。 作为一个示例，基本驱动电路可以是电荷泵。 在另一个例子中，BJT可以用作其自身的电荷泵。 在另一个例子中，可以独立地控制BJT的正和负的基极电流以调节来自BJT的输出电源电压VDD。

公开(公告)号：US09941848B1

公开(公告)日：2018-04-10

申请号：US14520060

申请日：2014-10-21

Applicant: Cirrus Logic, Inc.

Inventor： Ramin Zanbaghi ,  Aaron Brennan ,  Johann Gaboriau ,  Prashanth Drakshapalli ,  Vamsikrishna Parupalli

IPC: H03F1/34 ,  H03F3/187 ,  H03F1/02

CPC classification number: H03F3/187 ,  H03F1/02 ,  H03F1/14 ,  H03F2200/03 ,  H03F2200/135 ,  H03F2200/408 ,  H03F2200/54

Abstract: In accordance with embodiments of the present disclosure, a transconductance with capacitances feedback compensation amplifier may include a capacitor in parallel with an inner feedback loop of the amplifier for providing cascade compensation to the amplifier.