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公开(公告)号：US08207788B2
公开(公告)日：2012-06-26
申请号：US12082081
申请日：2008-04-07
申请人： Wai L. Lee , Patrick A. Quinn , Garry N. Link , Adam C. Broun , Eric T. King
发明人： Wai L. Lee , Patrick A. Quinn , Garry N. Link , Adam C. Broun , Eric T. King
IPC分类号： H03F3/217
CPC分类号： H03F1/301 , H03F1/342 , H03F3/2173
摘要： A differential feedback amplifier is provided with a feedback network wherein that feedback network is adjustable so as to improve the PSRR of the amplifier. In another aspect of the present invention, a differential feedback amplifier is provided with a feedback network wherein that feedback network is adjustable so as to improve the CMRR of the amplifier. In a further aspect of the present invention, a Class D amplifier is provided with a passive differential feedback, summing with an input current at a differential virtual ground produced by an amplifier which is a sub-section of the Class D amplifier.
摘要翻译： 差分反馈放大器设置有反馈网络，其中反馈网络是可调节的，以便改善放大器的PSRR。 在本发明的另一方面，差分反馈放大器设置有反馈网络，其中反馈网络是可调节的，以便改善放大器的CMRR。 在本发明的另一方面，D类放大器被提供有无源差分反馈，与由作为D类放大器的子部分的放大器产生的差分虚拟接地处的输入电流相加。
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公开(公告)号：US20080272842A1
公开(公告)日：2008-11-06
申请号：US12082081
申请日：2008-04-07
申请人： Wai L. Lee , Patrick A. Quinn , Garry N. Link , Adam C. Broun , Eric T. King
发明人： Wai L. Lee , Patrick A. Quinn , Garry N. Link , Adam C. Broun , Eric T. King
CPC分类号： H03F1/301 , H03F1/342 , H03F3/2173
摘要： A differential feedback amplifier is provided with a feedback network wherein that feedback network is adjustable so as to improve the PSRR of the amplifier. In another aspect of the present invention, a differential feedback amplifier is provided with a feedback network wherein that feedback network is adjustable so as to improve the CMRR of the amplifier. In a further aspect of the present invention, a Class D amplifier is provided with a passive differential feedback, summing with an input current at a differential virtual ground produced by an amplifier which is a sub-section of the Class D amplifier.
摘要翻译： 差分反馈放大器设置有反馈网络，其中反馈网络是可调节的，以便改善放大器的PSRR。 在本发明的另一方面，差分反馈放大器设置有反馈网络，其中反馈网络是可调节的，以便改善放大器的CMRR。 在本发明的另一方面，D类放大器被提供有无源差分反馈，与由作为D类放大器的子部分的放大器产生的差分虚拟接地处的输入电流相加。
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公开(公告)号：US5850409A
公开(公告)日：1998-12-15
申请号：US822622
申请日：1997-03-21
申请人： Garry N. Link
发明人： Garry N. Link
IPC分类号： H01S5/0683 , H01S3/00
CPC分类号： H01S5/06832
摘要： Laser modulation control apparatus and methods which provide direct control of the transmitted optical extinction ratio of a semiconductor laser. A relatively low frequency and low amplitude pilot tone is superimposed on the signal used to drive the laser. Setting the amplitude of the pilot tone to a fixed fraction of the laser modulation current causes the transmitted optical power to vary a fixed fraction of the optical data amplitude at the pilot tone frequency. By using feedback to control the laser modulation current, the amplitude of the variation can be maintained at a desired value, which in turn maintains the transmitted optical data amplitude at a constant value, regardless of variations due to operating temperature or laser aging. A separate control loop is employed to maintain the average optical power at a fixed value. Since the optical data amplitude and the average optical power remain constant, the optical extinction ratio is also constant. Alternate embodiments are disclosed.
摘要翻译： 提供对半导体激光器的透射光学消光比的直接控制的激光调制控制装置和方法。 在用于驱动激光器的信号上叠加相对低频和低振幅的导频音。 将导频音的幅度设定为激光调制电流的固定分数，导致发射的光功率改变导频音频率下的光学数据振幅的固定分数。 通过使用反馈来控制激光调制电流，可以将变化的幅度保持在期望的值，这又将传输的光学数据幅度保持在恒定值，而不管由于工作温度或激光老化引起的变化。 使用单独的控制环来将平均光功率维持在固定值。 由于光学数据幅度和平均光功率保持恒定，所以光消光比也是恒定的。 公开了替代实施例。
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公开(公告)号：US07215269B2
公开(公告)日：2007-05-08
申请号：US11249236
申请日：2005-10-12
申请人： Wai L. Lee , Xudong Zhao , Amit Kumar , Jianping Wen , Garry N Link
发明人： Wai L. Lee , Xudong Zhao , Amit Kumar , Jianping Wen , Garry N Link
IPC分类号： H03M3/00
CPC分类号： H03M3/452 , H03H11/04 , H03H17/0664 , H03H2218/04 , H03H2218/10 , H03M3/424 , H03M3/448 , H03M3/454 , H03M3/462
摘要： A radio receiver channel includes an analog front end and a digital signal processing section coupled together by an analog-to-digital converter (ADC) having a delta-sigma modulator coupled to a first digital decimation filter, which is coupled to second digital decimation filter, wherein the first decimation filter includes a source of finite impulse response coefficients coupled so as to provide a plurality of coefficients. The delta-sigma modulator includes a loop filter having a plurality of serially coupled integrators, and a multi-bit quantizer coupled to the loop filter; the multi-bit quantizer including an ADC operable to produce a multi-bit digital output signal, the ADC coupled to a DAC having dual DAC feedback loops, and a dynamic element matching function. In one embodiment, the delta-sigma modulator includes a fifth-order loop filter having five serially coupled integrators with a feedback path from the output to the input of the fifth integrator and a feedback path from the output to the input of the third integrator.
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公开(公告)号：US06188498B1
公开(公告)日：2001-02-13
申请号：US09116028
申请日：1998-07-15
IPC分类号： H04B1004
CPC分类号： H04B10/504 , H01S5/0683 , H04B10/564
摘要： The present invention is a method and apparatus for controlling a drive current of an optical transmitter having a laser. A sensing circuit generates a sensing signal responsive to an intensity of an optical radiation emitted by the laser. An error circuit is coupled to the sensing circuit to generate an error quantity in response to the sensing signal. An updating circuit is coupled to the error circuit to update a control quantity based on the error quantity synchronously with an input signal. The control quantity controls the drive current.
摘要翻译： 本发明是用于控制具有激光的光发射机的驱动电流的方法和装置。 感测电路响应于由激光器发射的光辐射的强度产生感测信号。 误差电路耦合到感测电路以产生响应于感测信号的误差量。 更新电路耦合到误差电路，以与输入信号同步地更新基于误差量的控制量。 控制量控制驱动电流。
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公开(公告)号：US5883910A
公开(公告)日：1999-03-16
申请号：US888026
申请日：1997-07-03
申请人： Garry N. Link
发明人： Garry N. Link
CPC分类号： H01S5/042
摘要： A semiconductor laser driver circuit that provides single supply operation over a wide supply voltage range (e.g., 3 V to 5.5 V), is capable of high speed data transmission, and is programmable over a wide laser modulation current range (such as 5 mA to 60 mA). The circuit includes temperature sensitive circuits to adjust for changes in Vbe over the operating temperature range, and to adjust a bias current to maintain transistor g.sub.m in the presence of temperature changes. Also included is an adaptive drive feature to accommodate different laser drive currents. Details of these and other features are disclosed.
摘要翻译： 在宽电源电压范围（例如3 V至5.5 V）上提供单电源供电的半导体激光驱动电路能够进行高速数据传输，并可在宽的激光调制电流范围（例如5 mA至 60 mA）。 该电路包括温度敏感电路，用于调节Vbe在工作温度范围内的变化，并调整偏置电流以保持晶体管gm存在温度变化。 还包括适应性驱动功能，以适应不同的激光驱动电流。 公开了这些和其他特征的细节。
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公开(公告)号：US5311150A
公开(公告)日：1994-05-10
申请号：US947200
申请日：1992-09-18
CPC分类号： H03K3/0231
摘要： An integrated oscillator includes an amplifier having first and second voltage inputs, and first and second current outputs, and a current mirror having an input coupled to the second current output of the amplifier and an output coupled to the first current output of the amplifier. The output of the current mirror and the first current output of the amplifier are coupled through a bonding pad to an external capacitor. A first comparator has a first input coupled to the first current output of the amplifier and a second input for receiving a first threshold voltage, and a second comparator has a first input coupled to the first current output of the amplifier and a second input for receiving a second threshold voltage. A flip-flop has a first input coupled to the output of the first comparator, a second input, and an output coupled to the second voltage input of the amplifier. A first multiplexer has a first input for receiving a reference voltage, a second input coupled to the output of the second comparator, and an output coupled to the first voltage input of the amplifier. A second multiplexer has a first input coupled to the output of the second comparator, a second input for receiving an enable signal, and an output coupled to the second input of the flip-flop. The output of the second comparator forms a one-shot output node responsive to the enable signal, and the output of the flip-flop forms a free-running oscillator output node.
摘要翻译： 集成振荡器包括具有第一和第二电压输入以及第一和第二电流输出的放大器，以及具有耦合到放大器的第二电流输出的输入的电流镜和耦合到放大器的第一电流输出的输出。 电流镜的输出和放大器的第一电流输出通过焊盘耦合到外部电容器。 第一比较器具有耦合到放大器的第一电流输出的第一输入端和用于接收第一阈值电压的第二输入端，第二比较器具有耦合到放大器的第一电流输出的第一输入端和用于接收的第二输入端 第二阈值电压。 触发器具有耦合到第一比较器的输出的第一输入，第二输入和耦合到放大器的第二电压输入的输出。 第一多路复用器具有用于接收参考电压的第一输入端，耦合到第二比较器的输出端的第二输入端和耦合到放大器的第一电压输入端的输出端。 第二多路复用器具有耦合到第二比较器的输出的第一输入端，用于接收使能信号的第二输入端和耦合到触发器的第二输入端的输出端。 第二比较器的输出响应于使能信号形成单触发输出节点，并且触发器的输出形成自由运行的振荡器输出节点。
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8.发明授权Laser diode driver having automatic power control with smooth enable function 失效激光二极管驱动器具有自动功率控制，平滑启用功能
公开(公告)号：US5802089A
公开(公告)日：1998-09-01
申请号：US731889
申请日：1996-10-22
申请人： Garry N. Link
发明人： Garry N. Link
CPC分类号： H01S5/06825 , H01S5/042
摘要： A laser diode driver with automatic power control in which start-up characteristics are controlled to avoid unsafe power levels at a driven laser is disclosed. The laser diode driver according to the invention produces a bias control signal that controls a bias current source such that the bias current supplied to the laser is maintained below a predetermined level during a start-up period.
摘要翻译： 公开了具有自动功率控制的激光二极管驱动器，其中控制启动特性以避免从动激光器处的不安全功率电平。 根据本发明的激光二极管驱动器产生偏置控制信号，该偏置控制信号控制偏置电流源，使得在启动期间提供给激光器的偏置电流保持在预定电平以下。
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公开(公告)号：US5796308A
公开(公告)日：1998-08-18
申请号：US672818
申请日：1996-06-28
申请人： Garry N. Link , Roland E. Andrews
发明人： Garry N. Link , Roland E. Andrews
CPC分类号： H03H11/24
摘要： A differential attenuator is described that is capable of automatic calibration using electronically adjustable circuit elements. The differential attenuator has positive and negative inputs and outputs. A resistor and capacitor couple the positive side input and output, while a matching resistor and capacitor couple the negative side input and output. Shunt resistors and shunt capacitors coupled to the positive and negative outputs are augmented and made electronically adjustable by multipliers having their signal inputs coupled to the respective side output nodes. The outputs of one set of multipliers are coupled to the other ends of the shunt resistors, while their multiplication coefficients are controlled by a dc.sub.-- control signal. The outputs of another set of multipliers are capacitively coupled back to their respective side output nodes, while their multiplication coefficients are controlled by an ac.sub.-- control signal. Through the use of these controls a wide range of side-to-side component variations can be compensated to maximize the common mode rejection ratio achievable.
摘要翻译： 描述了能够使用电子可调电路元件进行自动校准的差分衰减器。 差分衰减器具有正负输入和输出。 电阻和电容耦合正极输入和输出，而匹配电阻和电容耦合负侧输入和输出。 耦合到正和负输出的分流电阻器和分流电容器被增强，并且通过其信号输入耦合到相应的侧输出节点的乘法器进行电子调节。 一组乘法器的输出耦合到分流电阻器的另一端，而它们的乘法系数由直流控制信号控制。 另一组乘法器的输出电容耦合回各自的侧输出节点，而它们的乘法系数由交流控制信号控制。 通过使用这些控制，可以补偿各种各样的侧向分量变化，以最大化可实现的共模抑制比。
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