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1. 发明授权

US4893036A Differential signal delay circuit 失效
标题翻译：差分信号延迟电路
公开(公告)号：US4893036A
公开(公告)日：1990-01-09
申请号：US232285
申请日：1988-08-15
申请人： Richard E. Hester , Jerry R. Wahl
发明人： Richard E. Hester , Jerry R. Wahl
IPC分类号： H03K5/00 , H03K5/13
CPC分类号： H03K5/133 , H03K2005/00176 , H03K2005/00182
摘要： A delay circuit for differential signals has input terminals for receiving primary and complementary phases of the differential signals and output terminals upon which the primary and complementary phases of output differential signals are generated after a suitable delay. A differential comparator controls charging and discharging of first and second capacitors, one capacitor being provided for each phase for providing a seleced delay. The time difference between switching of the differential comparator and the subsequent voltage level transistion of the relative charges on the first and second capacitors determines the time delay dt. The delay circuit is compensated for power supply and temperature variation.
摘要翻译：用于差分信号的延迟电路具有用于接收差分信号的初级互补相位和输出端子的输入端子，在适当的延迟之后，输出差分信号的初级互补相位和互补相位在其上产生。差分比较器控制第一和第二电容器的充电和放电，为每个相位提供一个电容器用于提供选择的延迟。差分比较器的切换与第一和第二电容器上的相对电荷的后续电压电平之间的时间差确定时间延迟dt。延迟电路补偿电源和温度变化。

2. 发明授权

US4847519A Integrated, high speed, zero hold current and delay compensated charge pump 失效
标题翻译：集成，高速，零保持电流和延迟补偿电荷泵
公开(公告)号：US4847519A
公开(公告)日：1989-07-11
申请号：US108543
申请日：1987-10-14
申请人： Jerry R. Wahl , Richard E. Hester
发明人： Jerry R. Wahl , Richard E. Hester
IPC分类号： G05F3/22 , H03F3/45 , H03K17/66 , H03L7/089
CPC分类号： H03F3/4521 , G05F3/22 , H03F3/45071 , H03K17/667 , H03L7/0896 , H03F2203/45366
摘要： An integrated, high speed, zero hold current and delay compensated charge pump operable at one of two different selectable pumping currents. The charge pump includes first and second supply terminals, a first input terminal for receiving digital charge-up control signals, a second input terminal for receiving digital charge-down control signals, and an output terminal. A first transistorized differential amplifier controls a first current flow of a first polarity between the first supply terminal and the output terminal as a function of the charge-up control signals. A second differential amplifier controls a second current flow between the first and second supply terminals as a function of the charge-down control signals. A pump current mirror produces a mirrored second current flow of a second polarity between the output terminal and the second supply terminal as a function of the second current flow.
摘要翻译：集成的高速，零保持电流和延迟补偿电荷泵，可在两种不同的可选择泵浦电流之一下工作。电荷泵包括第一和第二电源端子，用于接收数字充电控制信号的第一输入端子，用于接收数字降压控制信号的第二输入端子和输出端子。第一晶体管化的差分放大器根据充电控制信号来控制第一电源端子和输出端子之间的第一极性的第一电流。第二差分放大器根据减压控制信号来控制第一和第二电源端之间的第二电流。作为第二电流的函数，泵电流镜在输出端和第二电源端之间产生第二极性的镜像的第二电流。

3. 发明授权

US4704586A Bipolar bandwidth switch for use in a phase-locked loop 失效
标题翻译：用于锁相环的双极带宽开关
公开(公告)号：US4704586A
公开(公告)日：1987-11-03
申请号：US22382
申请日：1987-03-06
申请人： Jerry R. Wahl , Richard E. Hester
发明人： Jerry R. Wahl , Richard E. Hester
IPC分类号： H03G5/10 , H03L7/107 , H03L7/10
CPC分类号： H03L7/107 , H03G5/10
摘要： An integrated circuit phase-locked loop includes a bipolar bandwidth switch for selectively coupling circuit elements of an external bandwidth filter network so as to control loop bandwidth. The bandwidth switch includes first and second switched terminal means which are coupled to the bandwidth filter network. A differential amplifier has a first control terminal coupled to the first switched terminal and a second control terminal coupled to the second switched terminal. The differential amplifier controls first and second currents as a function of a difference between potentials applied to the first and second switched terminals. A first current mirror couples the differential amplifier to the second switched terminal and controls current flow between a first supply terminal and the second switched terminal as a function of the first current. A second current mirror couples the differential amplifier to the second switched terminal and controls current flow between the second switched terminal and a second supply terminal as a function of the second current. Control means responsive to digital control signals control current flow through the differential amplifier, and thereby the impedance between the first and second switched terminals.
摘要翻译：集成电路锁相环包括用于选择性地耦合外部带宽滤波器网络的电路元件以便控制环路带宽的双极性带宽开关。带宽交换机包括耦合到带宽过滤网络的第一和第二交换终端装置。差分放大器具有耦合到第一交换终端的第一控制终端和耦合到第二交换终端的第二控制终端。差分放大器根据施加到第一和第二开关端子的电位之间的差异来控制第一和第二电流。第一电流镜将差分放大器耦合到第二开关端子，并且根据第一电流来控制第一电源端子和第二开关端子之间的电流。第二电流镜将差分放大器耦合到第二开关端子，并且根据第二电流控制第二开关端子和第二电源端子之间的电流。响应于数字控制信号的控制装置控制通过差分放大器的电流，从而控制第一和第二开关端子之间的阻抗。

4. 发明授权

US4771228A Output stage current limit circuit 失效
标题翻译：输出级限流电路
公开(公告)号：US4771228A
公开(公告)日：1988-09-13
申请号：US58770
申请日：1987-06-05
申请人： Richard E. Hester , Tuan Ngo
发明人： Richard E. Hester , Tuan Ngo
IPC分类号： G05F3/22 , G05F3/26
CPC分类号： G05F3/22
摘要： An amplifier output stage includes current limiting circuitry for limiting the current in the output stage if the output terminal is shorted to ground. The current sinking and the current sourcing output transistors each have a current limiting circuit which mirrors the collector current of the output transistor, produces a voltage which is a function of the mirrored collector current, and controls base current to the output transistor as a function of the voltage. The output current limiting function, therefore, is provided without sacrificing output voltage swing of the output stage.
摘要翻译：放大器输出级包括限流电路，用于限制输出端的电流，如果输出端短接到地。电流吸收和电流源输出晶体管各自具有电流限制电路，其反映输出晶体管的集电极电流，产生作为镜像集电极电流的函数的电压，并且控制作为输出晶体管的函数的基极电流电压。因此，在不牺牲输出级的输出电压摆幅的情况下提供输出限流功能。

5. 发明授权

US5649008A Circuit and method of reducing sidetone in a receive signal path 失效
标题翻译：在接收信号路径中减少旁路的电路和方法
公开(公告)号：US5649008A
公开(公告)日：1997-07-15
申请号：US284950
申请日：1994-08-02
申请人： Scott K. Bader , Richard E. Hester , Michael L. Gomez , James S. Mielke
发明人： Scott K. Bader , Richard E. Hester , Michael L. Gomez , James S. Mielke
IPC分类号： H04M1/58 , H04M1/725 , H04M9/08
CPC分类号： H04M1/585 , H04M1/725 , H04M9/08
摘要： A cordless telephone has receive (12) and transmit (14) signal paths for passing voice signals. Sidetones normally appear in the receive signal path from the near party's voice. A signal strength comparator (34) monitors the transmit signal path and the receive signal path and asserts a gain control signal when the transmit path signal strength exceeds a threshold set to a predetermined value below the receive path signal strength. The gain control signal decreases the gain (42) in the receive signal path to reduce undesirably loud sidetones in the speaker earpiece. When the transmit path signal strength is less than the predetermined threshold, the gain control signal is not asserted allowing maximum amplification in the receive signal path as the sidetone is sufficiently small as to not interfere with the main received voice signal, or otherwise become noticeably loud in the speaker earpiece.
摘要翻译：无绳电话具有用于通过语音信号的接收（12）和发送（14）信号路径。 Sidetones通常出现在接近信号路径中，从近方的声音。信号强度比较器（34）监测发射信号路径和接收信号路径，并且当发射路径信号强度超过设定在低于接收路径信号强度的预定值的阈值时，发出增益控制信号。增益控制信号减小接收信号路径中的增益（42），以减少扬声器耳机中不希望有的大的侧音。当发送路径信号强度小于预定阈值时，增益控制信号不被断言，允许接收信号路径中的最大放大，因为侧音足够小，以致不干扰主接收到的语音信号，或以其他方式变得显着地响亮在扬声器耳机。

6. 发明授权

US4843342A Differential amplifier with input bias current cancellation 失效
标题翻译：具有输入偏置电流消除的差分放大器
公开(公告)号：US4843342A
公开(公告)日：1989-06-27
申请号：US130526
申请日：1987-12-09
申请人： Richard E. Hester , Tuan V. Ngo
发明人： Richard E. Hester , Tuan V. Ngo
IPC分类号： H03F1/56 , H03F3/45
CPC分类号： H03F1/56 , H03F3/45071
摘要： A bias current cancellation circuit provides current to the bases of a pair of transistors forming a differential amplifier. A transistor of matched characteristics to the differential amplifier pair is operated so that its base current replicates the base currents of the differential transistor pair. This replicated base current is inverted by a current mirror which is connected to the bases of the differential transistional pair. A second order cancellation error caused by base current differences in the current mirror is cancelled by a feedback circuit so that only the base current of the matching transistor affects the currents supplied to differential amplifier.
摘要翻译：偏置电流消除电路为形成差分放大器的一对晶体管的基极提供电流。操作具有与差分放大器对的匹配特性的晶体管，使得其基极电流复制差分晶体管对的基极电流。这个复制的基极电流被连接到差分转置对的基极的电流镜反转。由电流镜中的基极电流差导致的二阶消除误差由反馈电路消除，使得只有匹配晶体管的基极电流才影响提供给差分放大器的电流。

7. 发明授权

US4460873A Active differential output direct current offset voltage compensation circuit for a differential amplifier 失效
标题翻译：用于差分放大器的有源差分输出直流偏移电压补偿电路
公开(公告)号：US4460873A
公开(公告)日：1984-07-17
申请号：US442946
申请日：1982-11-19
申请人： Richard E. Hester
发明人： Richard E. Hester
IPC分类号： H03F3/45
CPC分类号： H03F3/45479
摘要： The voltage output of a differential amplifier is adjusted using an active feedback loop so that there is no direct current potential difference between the differential outputs of the differential amplifier. A potential difference at the differential output of a differential amplifier due to inherent bias or operating characteristics of the system is referred to as direct current offset voltage and the need to correct this condition may be referred to as differential output direct current offset voltage compensation. The feedback loop to accomplish this compensation consists of one or more stages of isolation and amplification driven by the output voltages of the differential amplifier and having a high input impedance to diminish loading of the amplifier outputs. A voltage peak detection system is used in order to isolate direct current voltage values from alternating current voltage values appearing at the differential amplifier output. This direct current peak detected value controls a current source which sums its output current to the current output of the differential amplifier to drive any direct current differential output to a minimum or zero value.
摘要翻译：使用有源反馈环路调节差分放大器的电压输出，使差分放大器的差分输出之间不存在直流电位差。由于系统的固有偏置或工作特性，差分放大器的差分输出端的电位差称为直流偏移电压，并且需要校正该条件可称为差分输出直流偏移电压补偿。实现该补偿的反馈回路包括由差分放大器的输出电压驱动的一个或多个隔离和放大级，并具有高输入阻抗以减小放大器输出的负载。使用电压峰值检测系统，以将直流电压值与出现在差分放大器输出端的交流电压值隔离开来。该直流峰值检测值控制电流源，其电流源将其输出电流与差分放大器的电流输出相加，以将任何直流差分输出驱动到最小或零值。

8. 发明授权

US07024246B2 Automatic waveform output adjustment for an implantable medical device 有权
公开(公告)号：US07024246B2
公开(公告)日：2006-04-04
申请号：US10133961
申请日：2002-04-26
申请人： Carlos C. Acosta , Leroy L. Perz , Carleen J. Juran , Kevin L. Bright , Richard E. Hester
发明人： Carlos C. Acosta , Leroy L. Perz , Carleen J. Juran , Kevin L. Bright , Richard E. Hester
IPC分类号： A61N1/36
CPC分类号： A61N1/36125
摘要： Apparatus and method assure the electrical characteristics of a stimulation waveform to an electrode of an Implantable Neuro Stimulator. The embodiment comprises a regulator, a measurement module, a generator, and a processor. The generator provides an input signal to the regulator. The regulator consequently regulates the input signal in order to form a pulse that is applied to the electrode. The processor instructs the measurement module to perform an electrical measurement that is indicative of an amplitude of the pulse. If the electrical measurement is sufficiently different from a desired value, the processor instructs the generator to be reconfigured in order that the amplitude of the pulse is within an acceptable value. A redundant capacitor pair may be inserted in a capacitor arrangement in order to compensate for a reduced battery voltage, or a detected faulty component such as a capacitor or a regulator may be replaced with a redundant component.

9. 发明授权

US5528692A Frequency inversion scrambler with integrated high-pass filter having autozero to remove internal DC offset 失效
标题翻译：具有集成高通滤波器的频率反转扰频器具有自动归零以去除内部DC偏移
公开(公告)号：US5528692A
公开(公告)日：1996-06-18
申请号：US237528
申请日：1994-05-03
申请人： Richard E. Hester , Scott K. Bader
发明人： Richard E. Hester , Scott K. Bader
IPC分类号： H04K1/04 , H04M1/00 , H04M1/68
CPC分类号： H04K1/04
摘要： A frequency inversion scrambler in a cordless telephone utilizes an integrated high-pass filter (14) between a first stage low-pass filter (12) and modulator (16) to reduce the filter order while maintaining low group delay in the audio signal. The first stage low-pass filter and high-pass filter remove high frequency components and any DC offset from the filtered audio signal. The modulator translates the spectrum of the filtered signal to sum and difference frequencies. A second stage low-pass filter (18) removes the upper portion of the spectrum such that the resulting frequency spectrum is inverted with respect to the original audio signal to prevent eavesdropping of transmissions between the handset and base unit of the cordless telephone. Another frequency inversion circuit (30, 32, 34, 36) in the base unit inverts the frequency spectrum again back to its original state for transmission along telephone lines.
摘要翻译：无绳电话中的频率反转扰频器利用第一级低通滤波器（12）和调制器（16）之间的集成高通滤波器（14）来降低滤波器顺序，同时维持音频信号中的低群延迟。第一级低通滤波器和高通滤波器从滤波后的音频信号中去除高频分量和任何直流偏移。调制器将滤波信号的频谱转换为和和差频率。第二级低通滤波器（18）去除频谱的上部，使得所得到的频谱相对于原始音频信号反转，以防止在手机和无绳电话的基座单元之间的传输窃听。基本单元中的另一个频率反转电路（30,32,34,36）将频谱再次反转回其原始状态，以沿着电话线传输。

10. 发明授权

US4827222A Input offset voltage trimming network and method 失效
标题翻译：输入失调电压调整网络及方法
公开(公告)号：US4827222A
公开(公告)日：1989-05-02
申请号：US131804
申请日：1987-12-11
申请人： Richard E. Hester , Tuan V. Ngo
发明人： Richard E. Hester , Tuan V. Ngo
IPC分类号： H01C17/23 , H03F3/45
CPC分类号： H03F3/45623 , H01C17/23 , H03F2203/45048
摘要： Trimming of input offset voltage of a diferential amplifier is provided by a pair of resistance networks which are connected to the emitters of a pair of current mirror transistors. By adjusting the resistances of the resistance networks, the adjustment currents flowing through the current mirror transistors are selected to cancel out the input offset voltage of the differential amplifier. Each resistance network includes a plurality of resistors connected in series with a low resistance shorting link connected in parallel with each of the plurality of resistances. The input offset voltage is trimmed by selectively cutting the shorting links with a two-phase measure and trim process.
摘要翻译：通过连接到一对电流镜晶体管的发射极的一对电阻网络来提供差分放大器的输入失调电压的微调。通过调整电阻网络的电阻，选择流过电流镜晶体管的调节电流来抵消差分放大器的输入偏移电压。每个电阻网络包括与与多个电阻中的每一个平行连接的低电阻短路连杆串联连接的多个电阻器。通过用两相测量和修整过程选择性地切割短路链路来修剪输入失调电压。

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