专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US4485341A Current limiter circuit 失效
标题翻译：限流电路
公开(公告)号：US4485341A
公开(公告)日：1984-11-27
申请号：US402496
申请日：1982-07-28
申请人： Dennis L. Welty , Don W. Zobel
发明人： Dennis L. Welty , Don W. Zobel
IPC分类号： H03F3/26 , H03G11/00 , H04B1/58 , G05F3/20
CPC分类号： H04B1/58 , H03F3/26 , H03G11/002
摘要： A circuit for limiting the magnitude of current sourced from a first load circuit to a second load circuit to a predetermined value. The circuit includes a current sourcing circuit for sourcing current from the first load circuit to the second and a feedback circuit which is responsive to the magnitude of the current sourced to the second load circuit reaching the predetermined value for supplying any additional current that the second load circuit may require while inhibiting additional current from being sourced from the first load circuit.
摘要翻译：一种用于限制从第一负载电路到第二负载电路的电流的大小达到预定值的电路。电路包括用于从第一负载电路向第二负载电路提供电流的电流源电路和响应于来自第二负载电路的电流的幅度达到预定值的反馈电路，以提供任何附加电流，第二负载电路可能需要同时抑制额外的电流来自第一负载电路。

2. 发明授权

US4491804A Bias circuit which is independent of output device voltage characteristics for biasing an amplifier in class AB operation 失效
标题翻译：偏置电路，独立于输出装置电压特性，用于在AB类操作中偏置放大器
公开(公告)号：US4491804A
公开(公告)日：1985-01-01
申请号：US442808
申请日：1982-11-18
申请人： W. Eric Main , Dennis L. Welty , Don W. Zobel
发明人： W. Eric Main , Dennis L. Welty , Don W. Zobel
IPC分类号： H03F1/02 , H03F3/30
CPC分类号： H03F3/3072
摘要： A Class AB amplifier circuit includes bias circuitry for biasing the output transistor into partial conduction independent of the base-to-emitter voltage of the transistor. The bias circuitry is a simple circuit loop including the output transistor and forms the remainder of the amplifier circuit which can be fabricated in monolithic integrated circuit form. The loop comprises a differential amplifier for providing a substantially constant offset voltage across a pair of terminals between which is connected a current biasing component. The current biasing component is connected in series with the output transistor to produce a small quiescent current to flow therethrough, the value of which is independent of the transistor's characteristics.
摘要翻译： AB类放大器电路包括偏置电路，用于将输出晶体管偏置为独立于晶体管的基极 - 发射极电压的部分导通。偏置电路是一个简单的电路回路，包括输出晶体管，并形成放大器电路的其余部分，可以以单片集成电路形式制造。该环路包括差分放大器，用于在一对端子之间提供基本上恒定的偏移电压，在两个端子之间连接有电流偏置部件。电流偏置分量与输出晶体管串联连接以产生小的静态电流流过其中，其值与晶体管的特性无关。

3. 发明授权

US4431874A Balanced current multiplier circuit for a subscriber loop interface circuit 失效
标题翻译：用于用户环路接口电路的平衡电流倍增电路
公开(公告)号：US4431874A
公开(公告)日：1984-02-14
申请号：US305013
申请日：1981-09-24
申请人： Don W. Zobel , W. Eric Main , W. David Pace , Dennis L. Welty
发明人： Don W. Zobel , W. Eric Main , W. David Pace , Dennis L. Welty
IPC分类号： H04B1/58 , H04B3/03 , H04M19/00
CPC分类号： H04M19/005 , H04B1/586
摘要： A balanced multiplier circuit for a subscriber loop interface circuit (SLIC) which provides both loop current to a two-wire bidirectional subscriber loop and suppression of longitudinal signals generated at the two-wire loop input to the SLIC while maintaining the midpoint load voltage at half the available power supply voltage applied to the SLIC.
摘要翻译：用于用户环路接口电路（SLIC）的平衡乘法器电路，其向两线双向用户环路提供两个回路电流，并且抑制在到SLIC的两线环路输入处产生的纵向信号，同时将中点负载电压保持在一半可用的电源电压施加到SLIC。

4. 发明授权

US5198957A Transient protection circuit using common drain field effect transistors 失效
标题翻译：瞬态保护电路采用公共漏极场效应晶体管
公开(公告)号：US5198957A
公开(公告)日：1993-03-30
申请号：US547882
申请日：1990-07-02
申请人： Dennis L. Welty , John Bliss , Judith L. Sutor , Stephen P. Robb , David M. Susak , Lloyd H. Hayes
发明人： Dennis L. Welty , John Bliss , Judith L. Sutor , Stephen P. Robb , David M. Susak , Lloyd H. Hayes
IPC分类号： H02H3/20 , H04M3/18
CPC分类号： H02H3/20 , H04M3/18
摘要： A transient protection circuit provides protection from high voltage transients appearing along a transmission line by sensing a predetermined threshold of the voltage developed thereon and opening the conduction path through first and second switching circuits in the transmission line. The switching circuits are implemented with first and second serially coupled transistors sharing a common drain and enabled by a control signal during normal operation. The first and second transistors each have a diode oriented to conduct from the source to the drain for bi-directional operation. During high voltage transient conditions, a sensing circuit detect a predetermined threshold of the potential on the transmission line and disables one of the first and second transistors which opens the conduction path through the first and second switching circuits thereby suppressing the surge currents flowing therethrough.
摘要翻译：瞬态保护电路通过感测在其上产生的电压的预定阈值并且通过传输线中的第一和第二开关电路打开导通路径来提供沿着传输线出现的高电压瞬变的保护。开关电路由在正常操作期间共享公共漏极并由控制信号使能的第一和第二串联耦合晶体管实现。第一和第二晶体管各自具有二极管，其定向为从源极到漏极导通以进行双向操作。在高电压瞬态条件期间，感测电路检测传输线上的电位的预定阈值，并且禁用通过第一和第二开关电路打开导电路径的第一和第二晶体管中的一个，从而抑制流过其中的浪涌电流。

5. 发明授权

US4689506A Control circuit for use with electronic attenuators and method for providing a control signal proportional to absolute temperature 失效
标题翻译：用于电子衰减器的控制电路和提供与绝对温度成比例的控制信号的方法
公开(公告)号：US4689506A
公开(公告)日：1987-08-25
申请号：US772482
申请日：1985-09-04
申请人： W. David Pace , Dennis L. Welty
发明人： W. David Pace , Dennis L. Welty
IPC分类号： H03G3/02 , H03G3/00 , H03G3/30 , H03G3/32 , H04B1/44 , H04M1/60 , H04M9/08 , H03K3/26 , G06K7/10 , H03K3/01
CPC分类号： H03G3/3005 , H04M9/08 , Y10S323/907
摘要： A control circuit for developing a modulated voltage which is proportional to absolute temperature that includes a thermal current source for producing current having a predetermined temperature coefficient and current steering circuitry for proportionally steering the current between first and second outputs in response to a direct current bias voltage applied thereto wherein the current at the first output of the current steering circuitry flows through a resistor. The resistor is connected between a source of different current operating potential and the first output of the current steering circuitry whereby the voltage developed thereacross due to the current steered therethrough is proportional to absolute temperature.
摘要翻译：一种用于开发与绝对温度成比例的调制电压的控制电路，该调制电压包括用于产生具有预定温度系数的电流的热电流源和用于在第一和第二输出之间成比例地转向第一和第二输出之间的电流的电流控制电路，施加到其上，其中当前转向电路的第一输出处的电流流过电阻器。电阻器连接在不同电流工作电位的源极与电流转向电路的第一输出端之间，由此由于电流转向通过其产生的电压与绝对温度成比例。

6. 发明授权

US5329585A Subscriber line interface circuit for controlling AC and DC output impedance 失效
标题翻译：用户线接口电路，用于控制交流和直流输出阻抗
公开(公告)号：US5329585A
公开(公告)日：1994-07-12
申请号：US983197
申请日：1992-11-30
申请人： David M. Susak , Tony Takeshian , Dennis L. Welty
发明人： David M. Susak , Tony Takeshian , Dennis L. Welty
IPC分类号： H04M19/00 , H04M1/76 , H04M7/04
CPC分类号： H04M19/005
摘要： A subscriber line interface circuit (SLIC) sets AC and DC output impedances as seen by first and second transmission signals. The common mode variation and differential variation of the first and second transmission signals is AC-sensed to provide a common mode feedback signal and a differential feedback signal which in turn controls the AC output impedance. The DC component of the first and second transmission signals is blocked allowing downstream amplifiers to operate at reduced power supply potentials. The DC variation of the first and second transmission signals is also sensed for providing a DC feedback signal to control the DC output impedance.
摘要翻译：用户线接口电路（SLIC）设置由第一和第二传输信号所见的AC和DC输出阻抗。对第一和第二传输信号的共模变化和差分变化进行AC感测，以提供共模反馈信号和差分反馈信号，该反馈信号又控制AC输出阻抗。第一和第二传输信号的DC分量被阻塞，允许下游放大器以降低的电源电位工作。还检测第一和第二传输信号的DC变化，以提供DC反馈信号来控制DC输出阻抗。

7. 发明授权

US4724540A Speakerphone with fast idle mode 失效
标题翻译：具有快速空闲模式的扬声器
公开(公告)号：US4724540A
公开(公告)日：1988-02-09
申请号：US902920
申请日：1986-09-02
申请人： W. David Pace , Dennis L. Welty
发明人： W. David Pace , Dennis L. Welty
IPC分类号： H04M1/60 , H04M9/10 , H04M1/62
CPC分类号： H04M9/10
摘要： A speakerphone circuit having fast sensitive switching between the receive mode and the transmit mode is disclosed which includes circuitry for providing four point sensing at the input and output of both the transmit and receive attenuators located in the transmit and receive signal paths thereof for controlling the gains of the attenuators in a complementary manner. A logic control circuit comprising a controller circuit provides an attenuator algorithm that first detects that voice signals are present in both signal paths then quickly causes the attenuators to be set to equal gains during a fast idle mode to then allow the stronger of the two signals to set the operating mode of the speakerphone.
摘要翻译：公开了一种在接收模式和发射模式之间具有快速敏感切换的扬声器电路，其包括用于在位于其发射和接收信号路径中的发射和接收衰减器的输入和输出处提供四点感测的电路，用于控制增益的衰减器。包括控制器电路的逻辑控制电路提供衰减器算法，该衰减器算法首先检测到两个信号路径中存在语音信号，然后快速地使得衰减器在快速空闲模式期间被设置为相等的增益，从而允许两个信号中的较强的信号设置扬声器的操作模式。

8. 发明授权

US4648103A Flip-flop having divide inhibit circuitry to change divide ratio 失效
标题翻译：触发器具有除法禁止电路来改变分频比
公开(公告)号：US4648103A
公开(公告)日：1987-03-03
申请号：US656310
申请日：1984-10-01
申请人： Dennis L. Welty , W. David Pace
发明人： Dennis L. Welty , W. David Pace
IPC分类号： H03K3/037 , H03K23/66 , H03K19/08
CPC分类号： H03K23/667 , H03K23/66 , H03K3/037
摘要： An integrated D flip-flop circuit including a plurality of inverter gates produces an output signal having a frequency that is equal to the frequency of an applied alternating input signal divided by a predetermined divide ratio wherein the improvement comprises an additional inverter gate that has an output connected to a predetermined one of the interconnected inverter gates and is responsive to a divide inhibit signal being applied to an input thereof for changing the divide ratio of the D flip-flop circuit.
摘要翻译：包括多个反相器门的集成D触发器电路产生具有等于施加的交替输入信号的频率除以预定分频比的频率的输出信号，其中改进包括具有输出的附加反相器门连接到互连逆变器门中的预定的一个，并且响应于除法禁止信号被施加到其输入端以改变D触发器电路的分频比。

9. 发明授权

US06263199B1 Circuit and method of signal frequency conversion 有权
标题翻译：信号频率转换电路及方法
公开(公告)号：US06263199B1
公开(公告)日：2001-07-17
申请号：US09211168
申请日：1998-12-14
申请人： Klaas Wortel , Dennis L. Welty
发明人： Klaas Wortel , Dennis L. Welty
IPC分类号： H04B126
CPC分类号： H03D7/1441 , H03D7/1458 , H03D2200/0033 , H03D2200/0084
摘要： A mixer (20) has a differential transistor pair (22, 24) receiving first and second reference currents at first and second nodes (30, 34). An RF signal drives the differential transistor pair. A first switching circuit (44, 46) is coupled to the first node and a second switching circuit (52, 54) is coupled to the second node. An LO signal drives the first and second switching circuits. The first and second switching circuit each have first and second outputs that are cross-coupled at output nodes (48, 50) to provide a differential IF output current representative of the sum and difference between the frequency of the RF signal and the frequency of the LO signal.
摘要翻译：混频器（20）具有在第一和第二节点（30,34）处接收第一和第二参考电流的差分晶体管对（22,24）。 RF信号驱动差分晶体管对。第一开关电路（44,46）耦合到第一节点，并且第二开关电路（52,54）耦合到第二节点。 LO信号驱动第一和第二开关电路。第一和第二开关电路各自具有在输出节点（48,50）处交叉耦合的第一和第二输出，以提供代表RF信号的频率和RF信号的频率之间的和和之差的差分IF输出电流 LO信号。

10. 发明授权

US6104227A RF mixer circuit and method of operation 有权
标题翻译：射频混频电路及其操作方法
公开(公告)号：US6104227A
公开(公告)日：2000-08-15
申请号：US277867
申请日：1999-03-29
申请人： Jeffery C. Durec , David K. Lovelace , Dennis L. Welty
发明人： Jeffery C. Durec , David K. Lovelace , Dennis L. Welty
IPC分类号： H03D7/14 , G06F7/44
CPC分类号： H03D7/1433 , H03D7/1425 , H03D7/1441 , H03D7/145 , H03D7/1458 , H03D7/1491 , H03D2200/0025 , H03D2200/0043 , H03D2200/0084
摘要： An RF mixer (10) provides signal gain in a transconductor block (12). A first transistor (36) is sized M times larger than a second transistor (18) to generate the desired signal gain. The gain of the RF mixer (10) is the value M times an output impedance Z.sub.OUT divided by an input impedance Z.sub.IN. A first current (I.sub.40) conducted by the first transistor (36) is matched to a sum of the second current (I.sub.24) conducted by the second transistor (18) and a third current (I.sub.28). The first current is supplied to a first differential transistor pair (46, 48) and the summed current is supplied to a second differential transistor pair (56, 58) to provide balance in switching circuit (50).
摘要翻译： RF混频器（10）在跨导体块（12）中提供信号增益。第一晶体管（36）的尺寸大于第二晶体管（18）的M倍，以产生期望的信号增益。 RF混频器（10）的增益是输出阻抗ZOUT除以输入阻抗ZIN的值M。由第一晶体管（36）传导的第一电流（I40）与由第二晶体管（18）传导的第二电流（I24）和第三电流（I28）的和相匹配。将第一电流提供给第一差分晶体管对（46,48），并将求和的电流提供给第二差分晶体管对（56,58），以在开关电路（50）中提供平衡。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式