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1. 发明授权

US07893778B2 Flexible low current oscillator for multiphase operations 有权
标题翻译：灵活的低电流振荡器，用于多相操作
公开(公告)号：US07893778B2
公开(公告)日：2011-02-22
申请号：US12488413
申请日：2009-06-19
申请人： Behzad Mohtashemi , Allen Chang
发明人： Behzad Mohtashemi , Allen Chang
IPC分类号： H03B5/24 , H03K3/03
CPC分类号： H03K3/354 , H03K4/502
摘要： An oscillator includes a reference stage and multiple phase stages. The reference stage has a reference transistor having a gate coupled to a voltage reference and a drain coupled to a reference current source. Each phase stage includes a transistor, two current sources, a capacitor, switch, inverter, and latch. The transistor has a drain coupled to a first current source, a gate coupled to a node and a source coupled to the reference transistor's source. The capacitor and switch couple between the node and ground. The second current source couples to the node. The transistor's drain couples to the inverter's input. The inverter's output couples to the latch's set input. The latch's output couples to the switch. The inverter output also couples to the reset input of a subsequent phase stage's latch. The inverter output for a last stage couples to the reset input of a first stage latch.
摘要翻译：振荡器包括参考级和多相级。参考级具有参考晶体管，其具有耦合到参考电流源的电压参考和漏极的栅极。每个相位级包括晶体管，两个电流源，电容器，开关，反相器和锁存器。晶体管具有耦合到第一电流源的漏极，耦合到节点的栅极和耦合到参考晶体管源极的源极。节点与地之间的电容和开关耦合。第二个电流源耦合到节点。晶体管的漏极耦合到逆变器的输入。变频器的输出耦合到锁存器的输入。锁存器的输出耦合到开关。逆变器输出也耦合到后续相位级锁存器的复位输入。最后级的逆变器输出耦合到第一级锁存器的复位输入。

2. 发明授权

US08610509B2 Flexible low current oscillator for multiphase operations 有权
标题翻译：灵活的低电流振荡器，用于多相操作
公开(公告)号：US08610509B2
公开(公告)日：2013-12-17
申请号：US12981356
申请日：2010-12-29
申请人： Behzad Mohtashemi , Allen Chang
发明人： Behzad Mohtashemi , Allen Chang
IPC分类号： H03B27/00 , H03K3/03 , H03L5/00
CPC分类号： H03K3/354 , H03K4/502
摘要： A method for generating an oscillator signal uses a multiphase oscillator having a plurality of input stages and a reference stage. Each input stage produces an input stage voltage that represents a phase for the oscillator. The input stage voltages produced by each of the input stages are compared to a reference voltage produced by the reference stage. An input stage having a maximum input stage voltage is selected and an output of the selected input stage having the maximum input stage voltage is changed. A current need of the oscillator is detected with a negative feedback loop coupled to the reference stage. An appropriate supply current is provided to each input stage with the negative feedback loop.
摘要翻译：用于产生振荡器信号的方法使用具有多个输入级和参考级的多相振荡器。每个输入级产生一个表示振荡器相位的输入级电压。由每个输入级产生的输入级电压与由参考级产生的参考电压进行比较。选择具有最大输入级电压的输入级，并且改变具有最大输入级电压的所选输入级的输出。利用耦合到参考级的负反馈回路检测振荡器的当前需要。使用负反馈回路为每个输入级提供适当的电源电流。

3. 发明申请

US20110095833A1 FLEXIBLE LOW CURRENT OSCILLATOR FOR MULTIPHASE OPERATIONS 有权
标题翻译：灵活的低电流振荡器，用于多种操作
公开(公告)号：US20110095833A1
公开(公告)日：2011-04-28
申请号：US12981356
申请日：2010-12-29
申请人： Behzad Mohtashemi , Allen Chang
发明人： Behzad Mohtashemi , Allen Chang
IPC分类号： H03L5/00
CPC分类号： H03K3/354 , H03K4/502
摘要： A method for generating an oscillator signal uses a multiphase oscillator having a plurality of input stages and a reference stage. Each input stage produces an input stage voltage that represents a phase for the oscillator. The input stage voltages produced by each of the input stages are compared to a reference voltage produced by the reference stage. An input stage having a maximum input stage voltage is selected and an output of the selected input stage having the maximum input stage voltage is changed. A current need of the oscillator is detected with a negative feedback loop coupled to the reference stage. An appropriate supply current is provided to each input stage with the negative feedback loop.
摘要翻译：用于产生振荡器信号的方法使用具有多个输入级和参考级的多相振荡器。每个输入级产生一个表示振荡器相位的输入级电压。由每个输入级产生的输入级电压与由参考级产生的参考电压进行比较。选择具有最大输入级电压的输入级，并且改变具有最大输入级电压的所选输入级的输出。利用耦合到参考级的负反馈回路检测振荡器的当前需要。使用负反馈回路为每个输入级提供适当的电源电流。

4. 发明申请

US20100321121A1 FLEXIBLE LOW CURRENT OSCILLATOR FOR MULTIPHASE OPERATIONS 有权
标题翻译：灵活的低电流振荡器，用于多种操作
公开(公告)号：US20100321121A1
公开(公告)日：2010-12-23
申请号：US12488413
申请日：2009-06-19
申请人： Behzad Mohtashemi
发明人： Behzad Mohtashemi
IPC分类号： H03B27/00
CPC分类号： H03K3/354 , H03K4/502
摘要： An oscillator includes a reference stage and multiple phase stages. The reference stage has a reference transistor having a gate coupled to a voltage reference and a drain coupled to a reference current source. Each phase stage includes a transistor, two current sources, a capacitor, switch, inverter, and latch. The transistor has a drain coupled to a first current source, a gate coupled to a node and a source coupled to the reference transistor's source. The capacitor and switch couple between the node and ground. The second current source couples to the node. The transistor's drain couples to the inverter's input. The inverter's output couples to the latch's set input. The latch's output couples to the switch. The inverter output also couples to the reset input of a subsequent phase stage's latch. The inverter output for a last stage couples to the reset input of a first stage latch.
摘要翻译：振荡器包括参考级和多相级。参考级具有参考晶体管，其具有耦合到参考电流源的电压参考和漏极的栅极。每个相位级包括晶体管，两个电流源，电容器，开关，反相器和锁存器。晶体管具有耦合到第一电流源的漏极，耦合到节点的栅极和耦合到参考晶体管源极的源极。节点与地之间的电容和开关耦合。第二个电流源耦合到节点。晶体管的漏极耦合到逆变器的输入。变频器的输出耦合到锁存器的输入。锁存器的输出耦合到开关。逆变器输出也耦合到后续相位级锁存器的复位输入。最后级的逆变器输出耦合到第一级锁存器的复位输入。

5. 发明申请

US20050275394A1 Current-limiting circuitry 有权
标题翻译：限流电路
公开(公告)号：US20050275394A1
公开(公告)日：2005-12-15
申请号：US10867549
申请日：2004-06-10
申请人： Farhood Moraveji , Behzad Mohtashemi
发明人： Farhood Moraveji , Behzad Mohtashemi
IPC分类号： G05F1/565 , G05F3/04
CPC分类号： G05F1/565 , Y10S323/908
摘要： A field effect transistor (FET) driver circuit includes an error amplifier for providing a FET control signal and a current limiting amplifier for preventing excessive current flow through the FET. The current limiting amplifier generates an overcurrent signal when an excessive current is detected. In response to the overcurrent signal, a voltage control circuit adjusts the voltage at the output of the error amplifier to turn off the FET. Meanwhile, a pulldown circuit at an input of the error amplifier adjusts the voltage provided to that input to cause the error amplifier to provide an output voltage that also tends to turn off the FET. If a buffer is present at that input to the error amplifier, a second pulldown circuit is placed at the input to the buffer to maintain a stable unity gain across the buffer.
摘要翻译：场效应晶体管（FET）驱动电路包括用于提供FET控制信号的误差放大器和用于防止过量的电流流过FET的限流放大器。当检测到过大的电流时，限流放大器产生过电流信号。响应于过电流信号，电压控制电路调节误差放大器输出端的电压以关断FET。同时，误差放大器的输入处的下拉电路调节提供给该输入端的电压，使得误差放大器提供也倾向于关断FET的输出电压。如果在该输入端存在缓冲器到误差放大器，则在缓冲器的输入端放置一个第二下拉电路，以便在缓冲器上保持稳定的单位增益。

6. 发明授权

US07902894B2 Accurate hysteretic comparator and method 有权
标题翻译：准确的滞后比较器和方法
公开(公告)号：US07902894B2
公开(公告)日：2011-03-08
申请号：US12493142
申请日：2009-06-26
申请人： Behzad Mohtashemi
发明人： Behzad Mohtashemi
IPC分类号： H03K5/22
CPC分类号： H03K5/2481
摘要： A hysteretic comparator is proposed for comparing input signals and producing an output signal VOT with a hysteresis window Vhys. The hysteretic comparator includes a differential input stage with current output (DICO) having input transistors with transconductance Gmtnx for converting the input signals, with an input stage transconductance Gmin, into intermediate signal currents. A steerable offset current generator, driven by a steering control signal, steers an offset current source IOS to alternative offset currents. A current-to-voltage summing converter (IVSC) sums up the intermediate signal currents and the offset currents and converts the result into VOT plus the steering control signal causing Vhys=IOS/Gmin. A feedback resistance RNF is connected to the input transistors to form a negative feedback loop. The RNF is sized such that GMin, hence Vhys, becomes essentially solely dependent upon the feedback conductance GNF=1/RNF independent of the Gmtnx thus its process and environmental variation.
摘要翻译：提出了一种滞后比较器，用于比较输入信号并产生具有滞后窗口Vhys的输出信号VOT。迟滞比较器包括具有电流输出（DICO）的差分输入级，具有跨导Gmtnx的输入晶体管，用于将具有输入级跨导Gmin的输入信号转换成中间信号电流。由转向控制信号驱动的可转向偏移电流发生器将偏移电流源IOS转向替代偏移电流。电流 - 电压求和转换器（IVSC）将中间信号电流和偏移电流相加，并将结果转换为VOT加上导致Vhys = IOS / Gmin的转向控制信号。反馈电阻RNF连接到输入晶体管以形成负反馈回路。 RNF的大小使得GMin因此Vhys基本上仅依赖于反馈电导GNF = 1 / RNF，而与Gmtnx无关，因此其过程和环境变化。

7. 发明授权

US07015680B2 Current-limiting circuitry 有权
标题翻译：限流电路
公开(公告)号：US07015680B2
公开(公告)日：2006-03-21
申请号：US10867549
申请日：2004-06-10
申请人： Farhood Moraveji , Behzad Mohtashemi
发明人： Farhood Moraveji , Behzad Mohtashemi
IPC分类号： G05F1/569
CPC分类号： G05F1/565 , Y10S323/908
摘要： A field effect transistor (FET) driver circuit includes an error amplifier for providing a FET control signal and a current limiting amplifier for preventing excessive current flow through the FET. The current limiting amplifier generates an overcurrent signal when an excessive current is detected. In response to the overcurrent signal, a voltage control circuit adjusts the voltage at the output of the error amplifier to turn off the FET. Meanwhile, a pulldown circuit at an input of the error amplifier adjusts the voltage provided to that input to cause the error amplifier to provide an output voltage that also tends to turn off the FET. If a buffer is present at that input to the error amplifier, a second pulldown circuit is placed at the input to the buffer to maintain a stable unity gain across the buffer.
摘要翻译：场效应晶体管（FET）驱动电路包括用于提供FET控制信号的误差放大器和用于防止过量的电流流过FET的限流放大器。当检测到过大的电流时，限流放大器产生过电流信号。响应于过电流信号，电压控制电路调节误差放大器输出端的电压以关断FET。同时，误差放大器的输入处的下拉电路调节提供给该输入端的电压，使得误差放大器提供也倾向于关断FET的输出电压。如果在该输入端存在缓冲器到误差放大器，则在缓冲器的输入端放置一个第二下拉电路，以便在缓冲器上保持稳定的单位增益。

8. 发明授权

US07872546B1 Multi mode modulator and method with improved dynamic load regulation 有权
标题翻译：多模调制器和改进的动态负载调节方法
公开(公告)号：US07872546B1
公开(公告)日：2011-01-18
申请号：US12498566
申请日：2009-07-07
申请人： Behzad Mohtashemi , Allan Chang
发明人： Behzad Mohtashemi , Allan Chang
IPC分类号： H02M3/335 , H03K7/06 , H03K7/08 , H03K7/10
CPC分类号： H02M3/156 , H02M2001/0032 , Y02B70/16
摘要： A dual mode modulator is proposed for driving a power output stage having a serial connection of high-side power FET and low-side power FET. The dual mode modulator includes a PWM modulator operating under a PWM-frequency and a PFM modulator for controlling the power output stage. To improve the dynamic load regulation of the dual mode modulator, a dynamic frequency booster can be added to the dual mode modulator to boost up the PWM-frequency from its normal operating frequency during a PFM-to-PWM mode transition period. Secondly, a dynamic slew rate booster can be added to boost up an error amplifier slew rate of the PWM modulator from its normal operating slew rate during the mode transition period. Thirdly, a dynamic turn-off logic circuit can be added to turn off the low-side power FET during the mode transition period.
摘要翻译：提出了一种用于驱动具有高边功率FET和低边功率FET的串联连接的功率输出级的双模调制器。双模式调制器包括在PWM频率下操作的PWM调制器和用于控制功率输出级的PFM调制器。为了改善双模式调制器的动态负载调节，可以在双模式调制器中增加一个动态增频器，以在PFM到PWM模式转换期间将PWM频率从其正常工作频率提升。其次，可以添加动态转换速率增强器，以在模式转换期间将PWM调制器的误差放大器转换速率从正常工作转换速率提升。第三，可以添加动态关断逻辑电路以在模式转换期间关闭低端功率FET。

9. 发明申请

US20110006853A1 MULTI MODE MODULATOR AND METHOD WITH IMPROVED DYNAMIC LOAD REGULATION 有权
标题翻译：多模式调制器和改进的动态负载调节方法
公开(公告)号：US20110006853A1
公开(公告)日：2011-01-13
申请号：US12498566
申请日：2009-07-07
申请人： Behzad Mohtashemi , Allan Chang
发明人： Behzad Mohtashemi , Allan Chang
IPC分类号： H03K7/08
CPC分类号： H02M3/156 , H02M2001/0032 , Y02B70/16
摘要： A dual mode modulator is proposed for driving a power output stage having a serial connection of high-side power FET and low-side power FET. The dual mode modulator includes a PWM modulator operating under a PWM-frequency and a PFM modulator for controlling the power output stage. To improve the dynamic load regulation of the dual mode modulator, a dynamic frequency booster can be added to the dual mode modulator to boost up the PWM-frequency from its normal operating frequency during a PFM-to-PWM mode transition period. Secondly, a dynamic slew rate booster can be added to boost up an error amplifier slew rate of the PWM modulator from its normal operating slew rate during the mode transition period. Thirdly, a dynamic turn-off logic circuit can be added to turn off the low-side power FET during the mode transition period.
摘要翻译：提出了一种用于驱动具有高边功率FET和低边功率FET的串联连接的功率输出级的双模调制器。双模式调制器包括在PWM频率下操作的PWM调制器和用于控制功率输出级的PFM调制器。为了改善双模式调制器的动态负载调节，可以在双模式调制器中增加一个动态增频器，以在PFM到PWM模式转换期间将PWM频率从其正常工作频率提升。其次，可以添加动态转换速率增强器，以在模式转换期间将PWM调制器的误差放大器转换速率从正常工作转换速率提升。第三，可以添加动态关断逻辑电路以在模式转换期间关闭低端功率FET。

10. 发明申请

US20100327914A1 Accurate Hysteretic Comparator and Method 有权
标题翻译：精确滞回比较器和方法
公开(公告)号：US20100327914A1
公开(公告)日：2010-12-30
申请号：US12493142
申请日：2009-06-26
申请人： Behzad Mohtashemi
发明人： Behzad Mohtashemi
IPC分类号： H03K5/22
CPC分类号： H03K5/2481
摘要： A hysteretic comparator is proposed for comparing input signals and producing an output signal VOT with a hysteresis window Vhys. The hysteretic comparator includes a differential input stage with current output (DICO) having input transistors with transconductance Gmin, for converting the input signals, with an input stage transconductance Gmin, into intermediate signal currents. A steerable offset current generator, driven by a steering control signal, steers an offset current source IOS to alternative offset currents. A current-to-voltage summing converter (IVSC) sums up the intermediate signal currents and the offset currents and converts the result into VOT plus the steering control signal causing Vhys=IOS/Gmin. A feedback resistance RNF is connected to the input transistors to form a negative feedback loop. The RNF is sized such that GMin, hence Vhys, becomes essentially solely dependent upon the feedback conductance GNF=1/RNF independent of the Gmtnx, thus its process and environmental variation.
摘要翻译：提出了一种滞后比较器，用于比较输入信号并产生具有滞后窗口Vhys的输出信号VOT。迟滞比较器包括具有电流输出（DICO）的差分输入级，具有跨导Gmin的输入晶体管，用于将输入级跨导Gmin转换为中间信号电流。由转向控制信号驱动的可转向偏移电流发生器将偏移电流源IOS转向替代偏移电流。电流 - 电压求和转换器（IVSC）将中间信号电流和偏移电流相加，并将结果转换为VOT加上导致Vhys = IOS / Gmin的转向控制信号。反馈电阻RNF连接到输入晶体管以形成负反馈回路。 RNF的大小使得GMin因此Vhys基本上仅依赖于独立于Gmtnx的反馈电导率GNF = 1 / RNF，因此其过程和环境变化。

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