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1. 发明授权

US5726597A Method and circuit for reducing offset voltages for a differential input stage 失效
标题翻译：用于降低差分输入级的失调电压的方法和电路
公开(公告)号：US5726597A
公开(公告)日：1998-03-10
申请号：US706095
申请日：1996-08-30
申请人： Thomas D. Petty , Richard S. Griffith , Robert L. Vyne , Robert N. Dotson
发明人： Thomas D. Petty , Richard S. Griffith , Robert L. Vyne , Robert N. Dotson
IPC分类号： H03F3/45 , H03K5/24 , H03K5/22
CPC分类号： H03K5/2481 , H03F3/45762 , H03F2203/45342
摘要： A trim circuit (10) and method of reducing offset voltages in a differential input stage. The differential input transistors (32 and 42) have separate bulk terminals for receiving a voltage to compensate for the input offset voltage. A current source (60) supplies a static current to the offset compensation circuit for generating a bias voltage at node (55). The transistors (64 and 66) receive a voltage at input terminals (30 and 40) and supply an additional current to an offset compensation circuit (20). A switch circuit (50) has switch pairs (52, 56, and 54, 58) for transferring a voltage to the bulk terminal of one of the differential transistors (32 and 42) while grounding the bulk terminal of the other transistor. The differential voltage supplied across the bulk terminals of transistors (32 and 42) changes the threshold voltage of the transistors reducing the offset voltage of the input stage.
摘要翻译：一种微调电路（10）和减小差分输入级中的偏移电压的方法。差分输入晶体管（32和42）具有单独的体积端子，用于接收电压以补偿输入偏移电压。电流源（60）将静态电流提供给偏移补偿电路，用于在节点（55）处产生偏置电压。晶体管（64和66）在输入端（30和40）处接收电压，并向偏移补偿电路（20）提供附加电流。开关电路（50）具有用于将电压传送到差分晶体管（32和42）中的一个的体电极的开关对（52,56和54,58），同时接地另一个晶体管的体端子。在晶体管（32和42）的批量端子之间提供的差分电压改变了晶体管的阈值电压，从而降低了输入级的偏移电压。

2. 发明授权

US5699015A Low voltage operational amplifier and method 失效
标题翻译：低压运算放大器及方法
公开(公告)号：US5699015A
公开(公告)日：1997-12-16
申请号：US618544
申请日：1996-03-19
申请人： Robert N. Dotson , Richard S. Griffith , Thomas D. Petty , Robert L. Vyne
发明人： Robert N. Dotson , Richard S. Griffith , Thomas D. Petty , Robert L. Vyne
IPC分类号： H03F3/45 , H03F3/20 , H03F3/30 , H03F3/16 , H03F3/26
CPC分类号： H03F3/3001
摘要： Low voltage operational amplifier (10) operates in a voltage range of one to eight volts over a temperature range of 0.degree. to 70.degree. centigrade. Op amp input stage (12) uses N-channel depletion-mode MOSFETs to provide amplification of the differential input and maintain constant transconductance. Source follower MOSFET (13) provides unity gain in transferring the AC signal, STAGE-1 OUTPUT, to the base of current sinking transistor (18). Sink control circuit (14) and source control circuit (22) generate the base drive currents for transistors (18) and (24). The signal at the output of MOSFET (13) either causes the sink transistor (18) to sink current or the signal to be transposed by means of a translinear loop (16) and causes the source transistor (24) to source current.
摘要翻译：低压运算放大器（10）在0至70℃的温度范围内工作在1-8伏特的电压范围内。运算放大器输入级（12）使用N沟道耗尽型MOSFET来提供差分输入的放大并保持恒定的跨导。源极跟随器MOSFET（13）在将AC信号STAGE-1 OUTPUT传送到电流吸收晶体管（18）的基极时提供单位增益。漏极控制电路（14）和源极控制电路（22）产生用于晶体管（18）和（24）的基极驱动电流。 MOSFET（13）的输出处的信号或者使得宿晶体管（18）通过一个跨线性环路（16）吸收电流或被转置的信号，并且使源极晶体管（24）发射电流。

3. 发明授权

US5734296A Low voltage operational amplifier input stage and method 失效
标题翻译：低压运算放大器输入级和方法
公开(公告)号：US5734296A
公开(公告)日：1998-03-31
申请号：US618671
申请日：1996-03-19
申请人： Robert N. Dotson , Richard S. Griffith , Robert L. Vyne
发明人： Robert N. Dotson , Richard S. Griffith , Robert L. Vyne
IPC分类号： H03F3/30 , H03F3/343 , H03F3/45 , H03F3/16
CPC分类号： H03F3/4508 , H03F3/3067 , H03F3/343 , H03F3/45076 , H03F2203/45028 , H03F2203/45182
摘要： Low voltage operational amplifier (10) operates in a voltage range of one to eight volts over a temperature range of 0.degree. to 70.degree. centigrade. Op amp input stage (12) uses N-channel depletion-mode MOSFETs to provide amplification of the differential input and maintain constant transconductance. Source follower MOSFET (13) provides unity gain in transferring the AC signal, STAGE-1 OUTPUT, to the base of current sinking transistor (18). Sink control circuit (14) and source control circuit (22) generate the base drive currents for transistors (18) and (24). The signal at the output of MOSFET (13) either causes the sink transistor (18) to sink current or the signal to be transposed by means of a translinear loop (16) and causes the source transistor (24) to source current. An output stage provides approximately fifty milliamps of current drive and is quiescent until the output driver is selected.
摘要翻译：低压运算放大器（10）在0至70℃的温度范围内工作在1-8伏特的电压范围内。运算放大器输入级（12）使用N沟道耗尽型MOSFET来提供差分输入的放大并保持恒定的跨导。源极跟随器MOSFET（13）在将AC信号STAGE-1 OUTPUT传送到电流吸收晶体管（18）的基极时提供单位增益。漏极控制电路（14）和源极控制电路（22）产生用于晶体管（18）和（24）的基极驱动电流。 MOSFET（13）的输出处的信号或者使得宿晶体管（18）通过一个跨线性环路（16）吸收电流或者被转置的信号，并且使源极晶体管（24）产生电流。输出级提供大约五十毫安的电流驱动器，并且静止，直到选择输出驱动器为止。

4. 发明授权

US5798673A Low voltage operational amplifier bias circuit and method 失效
标题翻译：低压运算放大器偏置电路及方法
公开(公告)号：US5798673A
公开(公告)日：1998-08-25
申请号：US619446
申请日：1996-03-19
申请人： Richard S. Griffith , Thomas D. Petty , Robert L. Vyne
发明人： Richard S. Griffith , Thomas D. Petty , Robert L. Vyne
IPC分类号： H03F3/30 , H03F3/45
CPC分类号： H03F3/3067
摘要： Low voltage operational amplifier (10) operates in a voltage range of one to eight volts over a temperature range of 0.degree. to 70.degree. centigrade. Op amp input stage (12) uses N-channel depletion-mode MOSFETs to provide amplification of the differential input and maintain constant transconductance. Source follower MOSFET (13) provides unity gain in transferring the AC signal, STAGE-1 OUTPUT, to the base of current sinking transistor (18). Sink control circuit (14) and source control circuit (22) generate the base drive currents for in transistors (18) and (24). The signal at the output of MOSFET (13) either causes the sink transistor (18) to sink current or the signal to be transposed by means of a translinear loop (16) and causes the source transistor (24) to source current.
摘要翻译：低压运算放大器（10）在0至70℃的温度范围内工作在1-8伏特的电压范围内。运算放大器输入级（12）使用N沟道耗尽型MOSFET来提供差分输入的放大并保持恒定的跨导。源极跟随器MOSFET（13）在将AC信号STAGE-1 OUTPUT传送到电流吸收晶体管（18）的基极时提供单位增益。漏极控制电路（14）和源极控制电路（22）产生晶体管（18）和（24）中的基极驱动电流。 MOSFET（13）的输出处的信号或者使得宿晶体管（18）通过一个跨线性环路（16）吸收电流或被转置的信号，并且使源极晶体管（24）发射电流。

5. 发明授权

US6133764A Comparator circuit and method 有权
标题翻译：比较电路和方法
公开(公告)号：US6133764A
公开(公告)日：2000-10-17
申请号：US238773
申请日：1999-01-27
申请人： Richard S. Griffith , Robert L. Vyne , Thomas A. Somerville
发明人： Richard S. Griffith , Robert L. Vyne , Thomas A. Somerville
IPC分类号： H03K3/3565 , H03K5/24 , H03K5/22
CPC分类号： H03K3/3565 , H03K5/2472
摘要： A comparator circuit (10) with hysteresis having transistors with the same threshold voltage and a method for comparing input signals. The comparator circuit (10) includes a current mirror (11) coupled to a common electrode differential pair (12) and to a feedback circuit (13). The current mirror (11) has a large output impedance and provides a plurality of output currents (I.sub.21, I.sub.26, I.sub.31). Some (I.sub.21, I.sub.26) of the currents are transmitted to the common electrode differential pair and one (I.sub.31) of the currents is transmitted to the feedback circuit (13). The output currents (I.sub.21, I.sub.26, I.sub.31) are modulated to generate positive feedback signals that control changing the output state of the comparator circuit (10) as well as provide hysteresis for the comparator circuit (10).
摘要翻译：具有具有相同阈值电压的晶体管的滞后的比较器电路（10）和用于比较输入信号的方法。比较器电路（10）包括耦合到公共电极差分对（12）和反馈电路（13）的电流镜（11）。电流镜（11）具有大的输出阻抗并提供多个输出电流（I21，I26，I31）。一些（I21，I26）的电流被传输到公共电极差分对，一个（I31）电流被传输到反馈电路13。输出电流（I21，I26，I31）被调制以产生正反馈信号，该正反馈信号控制改变比较器电路（10）的输出状态，并为比较器电路（10）提供迟滞。

6. 发明授权

US06144569A System and method for recovering from a power supply interruption 有权
标题翻译：从电源中断恢复的系统和方法
公开(公告)号：US06144569A
公开(公告)日：2000-11-07
申请号：US514800
申请日：2000-02-29
申请人： David Rodriguez , Richard S. Griffith
发明人： David Rodriguez , Richard S. Griffith
IPC分类号： G06F1/30 , H04B1/16 , H02M1/00
CPC分类号： G06F1/30 , H04B1/1607
摘要： A power cut detection and recovery system (36) provides for the recovery of an electronic apparatus (20) in response to a momentary interruption in the voltage level of a power supply (46) coupled to that apparatus. The system includes a level detecting circuit (80) coupled to the power supply (46) for monitoring the voltage supplied to the apparatus (20). The system further includes internal reference supply circuits (86) that provide voltage and current references to operate the apparatus (20). A power cut monitor and reference control circuit (84) is coupled to the level detecting circuit (80) and is capable of causing the internal reference supply circuits (86) to remain enabled upon the detection of a momentary cut in the externally supplied power (46). A second level detecting circuit (90), dependent on the internal reference supply circuits (86), and the power cut monitor and reference control circuit (84) are coupled to an under voltage monitor and recovery circuit (88) that can cause the apparatus (20) to restart upon the recovery of the voltage level to a value above a predetermined level. By maintaining the internal reference supply circuits (86) in an enabled state, the apparatus (20) is able to restart in its pre-interruption state if the voltage level remains above a POR level.
摘要翻译：断电检测和恢复系统（36）响应于耦合到该设备的电源（46）的电压电平的瞬时中断，提供电子设备（20）的恢复。该系统包括耦合到电源（46）的电平检测电路（80），用于监视提供给设备（20）的电压。该系统还包括提供电压和电流参考以便操作装置（20）的内部参考电源电路（86）。断电监视器和参考控制电路（84）耦合到电平检测电路（80），并且能够使内部基准电源电路（86）在检测到外部供电电力瞬间切断时保持使能（ 46）。取决于内部参考电源电路（86）和断电监视器和参考控制电路（84）的第二电平检测电路（90）耦合到欠电压监视和恢复电路（88），所述欠电压监视和恢复电路能够使装置（20）在将电压电平恢复到高于预定电平的值时重启。通过将内部参考电源电路（86）保持在使能状态，如果电压电平保持高于POR电平，则装置（20）能够以其预中断状态重启。

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