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1. 发明授权

US07415260B2 Current-mode direct conversion receiver 有权
标题翻译：电流模式直接转换接收器
公开(公告)号：US07415260B2
公开(公告)日：2008-08-19
申请号：US10795740
申请日：2004-03-08
申请人： Troy L. Stockstad , Klaas Wortel , Luis J. Briones , David Lovelace
发明人： Troy L. Stockstad , Klaas Wortel , Luis J. Briones , David Lovelace
IPC分类号： H04B1/00
CPC分类号： H04B1/30
摘要： A current-mode direct conversion RF receiver is presented. In one set of embodiments the RF receiver comprises a simple transconductor input stage to create a current-mode modulated signal from a voltage-mode modulated signal. A downconversion mixer may be coupled to the transconductor input stage via a low impedance current cascode stage, and may operate to create a set of current-mode quadrature baseband signals from the current-mode modulated signal. The downconversion mixer may be implemented with a transistor-switching network, which may be driven by a phase locked loop (PLL) with quadrature outputs. The set of current-mode quadrature baseband signals may be converted back to the voltage domain by a transimpedance filter, which may perform channel selection for the receiver. The transimpedance filter may additionally include a low frequency zero to remove DC offsets. The receiver may be implemented using CMOS design technologies and operated with minimal self-mixing effects, minimal DC offset in the baseband signal, and utilizing low voltages.
摘要翻译：提出了一种电流模式直接转换RF接收机。在一组实施例中，RF接收机包括简单的跨导体输入级，以从电压模式调制信号产生电流模式调制信号。下变频混频器可以经由低阻抗电流共源共栅级耦合到跨导体输入级，并且可以操作以从当前模式调制信号创建一组电流模式正交基带信号。下变频混频器可以用晶体管切换网络来实现，其可以由具有正交输出的锁相环（PLL）来驱动。电流模式正交基带信号的集合可以通过跨阻滤波器转换回电压域，该跨阻滤波器可以对接收机执行信道选择。跨阻滤波器可以另外包括用于去除DC偏移的低频零点。接收机可以使用CMOS设计技术来实现，并且以最小的自混合效应，基带信号中的最小DC偏移和利用低电压进行操作。

2. 发明授权

US07043222B2 FSK modulator using IQ up-mixers and sinewave coded DACs 有权
标题翻译： FSK调制器使用IQ上变频器和正弦波编码DAC
公开(公告)号：US07043222B2
公开(公告)日：2006-05-09
申请号：US10653322
申请日：2003-09-02
申请人： Klaas Wortel , Luis J. Briones , Troy L. Stockstad
发明人： Klaas Wortel , Luis J. Briones , Troy L. Stockstad
IPC分类号： H04B1/10
CPC分类号： H04L27/12
摘要： A radio transmitter system designed using an FSK modulator with IQ up-mixers and sinewave coded digital-to-analog converters (DACs). The radio transmitter system may include a frequency shift keying (FSK) coding logic circuit coupled to the inputs of an IQ modulation and image reject up-mixer through a respective DAC and a respective low pass filter (LPF) for each the I and the Q channels. The FSK modulation scheme may employ sine and cosine signals for the I and Q channels, respectively, where the sine and cosine waves are directly coded into the DACs. The coded levels required by the DACs may be generated using current sources and may be Gray-coded. The output of the IQ modulation and image reject up-mixer may be connected to a power amplifier, which may be used to transmit the modulated RF signal via a loop antenna.
摘要翻译：无线电发射机系统使用具有IQ上变频器和正弦波编码的数模转换器（DAC）的FSK调制器设计。无线电发射机系统可以包括频移键控（FSK）编码逻辑电路，其通过相应的DAC和针对I和Q的每个的相应的低通滤波器（LPF）耦合到IQ调制和图像拒绝上混频器的输入频道 FSK调制方案可以分别将正弦和余弦信号用于I和Q通道，其中正弦和余弦波被直接编码到DAC中。 DAC所需的编码电平可以使用电流源生成，并且可以是灰色编码的。 IQ调制和图像拒绝上混频器的输出可以连接到功率放大器，功率放大器可以用于经由环形天线发送经调制的RF信号。

3. 发明授权

US06703894B1 Baseband filter for receivers 有权
标题翻译：接收器的基带滤波器
公开(公告)号：US06703894B1
公开(公告)日：2004-03-09
申请号：US10341158
申请日：2003-01-13
申请人： Troy L. Stockstad , Klaas Wortel
发明人： Troy L. Stockstad , Klaas Wortel
IPC分类号： H03B100
CPC分类号： H03H11/04 , H03H19/004
摘要： A filter circuit. In one embodiment, the filter circuit includes a continuous time (CT) filter, a switched capacitor (SWC) filter, and an SWC integrator. The CT filter is coupled to receive an input signal from an external source. The CT filter may be a low-pass filter. The SWC filter is coupled to receive an output signal from the CT filter, and provide an output information signal. The SWC filter may also be a low pass filter. A feedback loop may be present between the output of the SWC filter and the input of the CT filter. The SWC integrator samples the output signal from the SWC filter and provides an output signal to the CT filter. The output signal is combined with the input signal to the CT filter. A D.C. offset may be substantially removed from the information signal provided by the output of the SWC filter.
摘要翻译：滤波电路。在一个实施例中，滤波电路包括连续时间（CT）滤波器，开关电容器（SWC）滤波器和SWC积分器。 CT滤波器被耦合以从外部源接收输入信号。 CT滤波器可以是低通滤波器。 SWC滤波器被耦合以从CT滤波器接收输出信号，并提供输出信息信号。 SWC滤波器也可以是低通滤波器。在SWC滤波器的输出和CT滤波器的输入之间可能存在反馈回路。 SWC积分器对SWC滤波器的输出信号进行采样，并向CT滤波器提供输出信号。输出信号与CT滤波器的输入信号相结合。可以从SWC滤波器的输出提供的信息信号中基本上去除直流偏移。

4. 发明授权

US06870422B2 Low voltage rail-to-rail CMOS input stage 有权
标题翻译：低电压轨至轨CMOS输入级
公开(公告)号：US06870422B2
公开(公告)日：2005-03-22
申请号：US10013581
申请日：2001-12-10
申请人： Troy L. Stockstad
发明人： Troy L. Stockstad
IPC分类号： H03K19/0175 , H03F3/45
CPC分类号： H03F3/45192 , H03F2203/45342 , H03F2203/45612
摘要： The present invention discloses a low voltage rail-to-rail CMOS input stage. The input stage includes a differential pail of P-channel metal oxide semiconductor field effect (PMOS) transistors, which produces differential output current signal. The input stage further includes a pair of N-channel depletion-mode metal oxide semiconductor field effect (NMOS) transistors, coupled to the bulk terminals of the differential pair of PMOS transistors, for receiving an input signal. The depletion-mode NMOS transistors further act as source follower devices to drive the bulk terminals of the differential pair of PMOS transistors.
摘要翻译：本发明公开了一种低电压轨至轨CMOS输入级。输入级包括产生差分输出电流信号的P沟道金属氧化物半导体场效应（PMOS）晶体管的差分桶。输入级还包括耦合到PMOS晶体管的差分对的体电极的一对N沟道耗尽型金属氧化物半导体场效应（NMOS）晶体管，用于接收输入信号。耗尽型NMOS晶体管还用作源极跟随器件来驱动差分PMOS晶体管的体端子。

5. 发明授权

US5422600A Amplifier input stage with charge pump supplying a differential transistor pair 失效
标题翻译：具有电荷泵的放大器输入级提供差分晶体管对
公开(公告)号：US5422600A
公开(公告)日：1995-06-06
申请号：US264290
申请日：1994-06-23
申请人： Thomas D. Petty , Robert L. Vyne , Troy L. Stockstad
发明人： Thomas D. Petty , Robert L. Vyne , Troy L. Stockstad
IPC分类号： H03F3/45
CPC分类号： H03F3/45094 , H03F2203/45028 , H03F2203/45124 , H03F2203/45476 , H03F2203/45648 , H03F2203/45674
摘要： An input stage to an amplifier circuit (10) operating with a one volt power supply potential (32) receives a differential input signal. A charge pump (36) increases the one volt power supply potential to 1.8 volts for providing additional head-room for the differential input signal. A current source (44) controls a current mirror (40-42) to draw a predetermined current from the charge pump to supply the active conduction path of a differential transistor pair (12-14). An output stage (34) of the amplifier circuit operates off the one volt power supply potential. Since the charge pump drives only the differential transistor pair through the current mirror, it may be made small to fit on the same integrated circuit as the amplifier including any necessary pump capacitors.
摘要翻译：用一伏电源电位（32）工作的放大器电路（10）的输入级接收差分输入信号。电荷泵（36）将一伏特电源电位增加到1.8伏，为差分输入信号提供额外的头部空间。电流源（44）控制电流镜（40-42）从电荷泵吸取预定电流以提供差动晶体管对（12-14）的有源导通路径。放大器电路的输出级（34）操作一伏特电源电位。由于电荷泵仅驱动通过电流镜的差分晶体管对，所以可以使其小到与包括任何必需的泵电容器的放大器相同的集成电路。

6. 发明授权

US06788506B1 Integrated circuit and method of operation 有权
标题翻译：集成电路和操作方法
公开(公告)号：US06788506B1
公开(公告)日：2004-09-07
申请号：US09711420
申请日：2000-11-13
申请人： Troy L. Stockstad
发明人： Troy L. Stockstad
IPC分类号： H02H900
CPC分类号： H03K5/08
摘要： An integrated circuit includes circuit nodes (111 and 131), a resistor (210) coupling together the nodes, a comparator (230) having two inputs and an output where a first one of the two inputs is coupled to the resistor and a first one of the nodes, and a three-terminal device (220) having a first terminal coupled to a second one of the nodes and the resistor and also having a second terminal coupled to the output of the comparator.
摘要翻译：集成电路包括电路节点（111和131），将节点耦合在一起的电阻器（210），具有两个输入的比较器（230）和两个输入端中的第一个耦合到电阻器的输出端和第一个以及具有耦合到所述节点中的第二节点和所述电阻器的第一端子并且还具有耦合到所述比较器的输出的第二端子的三端子装置（220）。

7. 发明授权

US5675268A Overcurrent detection circuit for a power MOSFET and method therefor 失效
标题翻译：功率MOSFET过电流检测电路及其方法
公开(公告)号：US5675268A
公开(公告)日：1997-10-07
申请号：US538522
申请日：1995-10-03
申请人： Thomas D. Petty , Troy L. Stockstad , Warren J. Schultz
发明人： Thomas D. Petty , Troy L. Stockstad , Warren J. Schultz
IPC分类号： H03K17/082 , H03K5/153 , H03K5/22
CPC分类号： H03K17/0822
摘要： An overcurrent detector circuit (21) for a power MOSFET (22) is described. The overcurrent detector circuit (21) generates a bias voltage corresponding to the drain to source voltage of the power MOSFET (22). The drain to source voltage correlates directly to the current being conducted by the power MOSFET (22). An overcurrent condition occurs when the power MOSFET (22) exceeds a predetermined current. The bias voltage is applied to a transistor (24) for generating a current. A current source (29) couples to the transistor (24). The current provided by the transistor equals the reference current of the current source (29) when the power MOSFET conducts the predetermined current. The overcurrent detector circuit (21) generates a signal indicating a overcurrent condition does not exist when the reference current is greater the current provided by the transistor. Conversely, the overcurrent detector circuit (21) generates a signal indicating the overcurrent condition when the current provided by the transistor exceeds the reference current.
摘要翻译：描述了用于功率MOSFET（22）的过电流检测器电路（21）。过电流检测器电路（21）产生对应于功率MOSFET（22）的漏极 - 源极电压的偏置电压。漏极到源极电压直接与由功率MOSFET（22）传导的电流相关。当功率MOSFET（22）超过预定电流时，发生过电流状况。偏置电压被施加到用于产生电流的晶体管（24）。电流源（29）耦合到晶体管（24）。当功率MOSFET导通预定电流时，由晶体管提供的电流等于电流源（29）的参考电流。过电流检测器电路（21）产生指示当晶体管提供的电流的参考电流大时，过电流状态不存在的信号。相反，当由晶体管提供的电流超过参考电流时，过电流检测器电路（21）产生指示过电流状况的信号。

8. 发明授权

US5471174A Amplifier having an output stage with bias current cancellation 失效
标题翻译：具有偏置电流消除的输出级的放大器
公开(公告)号：US5471174A
公开(公告)日：1995-11-28
申请号：US349578
申请日：1994-12-05
申请人： Thomas D. Petty , Troy L. Stockstad , Robert L. Vyne
发明人： Thomas D. Petty , Troy L. Stockstad , Robert L. Vyne
IPC分类号： H03F1/56 , H03F3/343 , H03F3/45
CPC分类号： H03F3/343 , H03F1/56
摘要： An amplifier circuit (10) receives a differential input signal and provides an amplified differential signal. A converter circuit (14) is responsive to the amplified differential signal and provides a single-ended signal. An output stage (16) is responsive to the single-ended signal for providing an output signal of the amplifier circuit. The output stage provides bias cancellation for the single-ended signal by injecting a current equal to the bias requirement of the input transistors (20, 38). The bias cancellation maintains a high input impedance and high gain and output drive for the output stage.
摘要翻译：放大器电路（10）接收差分输入信号并提供放大的差分信号。 A转换器电路（14）响应放大的差分信号并提供单端信号。输出级（16）响应于单端信号以提供放大器电路的输出信号。输出级通过注入等于输入晶体管（20,38）的偏置要求的电流来为单端信号提供偏置消除。偏置消除在输出级保持高输入阻抗和高增益和输出驱动。

9. 发明授权

US06366167B1 Low voltage rail-to-rail CMOS input stage 有权
标题翻译：低电压轨至轨CMOS输入级
公开(公告)号：US06366167B1
公开(公告)日：2002-04-02
申请号：US09516008
申请日：2000-02-29
申请人： Troy L. Stockstad
发明人： Troy L. Stockstad
IPC分类号： H03F345
CPC分类号： H03F3/45192 , H03F2203/45342 , H03F2203/45612
摘要： The present invention discloses a low voltage rail-to-rail CMOS input stage. The input stage includes a differential pail of P-channel metal oxide semiconductor field effect (PMOS) transistors, which produces differential output current signal. The input stage further includes a pair of N-channel depletion-mode metal oxide semiconductor field effect (NMOS) transistors, coupled to the bulk terminals of the differential pair of PMOS transistors, for receiving an input signal. The depletion-mode NMOS transistors further act as source follower devices to drive the bulk terminals of the differential pair of PMOS transistors.
摘要翻译：本发明公开了一种低电压轨至轨CMOS输入级。输入级包括产生差分输出电流信号的P沟道金属氧化物半导体场效应（PMOS）晶体管的差分桶。输入级还包括耦合到PMOS晶体管的差分对的体电极的一对N沟道耗尽型金属氧化物半导体场效应（NMOS）晶体管，用于接收输入信号。耗尽型NMOS晶体管还用作源极跟随器件来驱动差分PMOS晶体管的体端子。

10. 发明授权

US5804944A Battery protection system and process for charging a battery 失效
公开(公告)号：US5804944A
公开(公告)日：1998-09-08
申请号：US833437
申请日：1997-04-07
申请人： Jade Alberkrack , Troy L. Stockstad
发明人： Jade Alberkrack , Troy L. Stockstad
IPC分类号： H02J7/04 , H02H7/18 , H02J7/00 , H02J7/10 , G01N27/27
CPC分类号： H02J7/0026 , H02J7/0011 , H02J7/0021 , H02J7/0093
摘要： A battery protection system (20) controls a process for charging a battery pack (15). A hysteresis comparator (54) senses a charging current flowing through the battery pack (15) and switches off a charging switch (31) to interrupt the charging current when the charging current reaches an upper limit. A transient current is then generated by an inductor (34). The hysteresis comparator (54) senses the transient current flowing through the battery pack (15) and switches on the charging switch (31) to regenerate the charging current when the transient current decreases substantially to zero. Periodically, a battery monitoring circuit (40) switches off the charging switch (31) and measures an open circuit voltage across each battery cell in the battery pack (15). In response to the open circuit voltage of a battery cell reaching a fully charged voltage, the battery monitoring circuit (40) switches off the charging switch (31) to terminate the charging process.

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