Patents by Inventor Jimes Lei

Jimes Lei has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9975145
    Abstract: An electrical waveform generating circuit has a pair of Pulse Amplitude Controlled Switching Current Sources (PACS). A gate pulse driver circuit is coupled to an input of each of the pair of PACS for sending gate pulses for driving the pair of PACS. A digital-to-analog converter (DAC) circuit is coupled to the gate pulse driver circuit for controlling amplitudes of the gate pulses. A transducer is coupled to the PACS.
    Type: Grant
    Filed: October 3, 2013
    Date of Patent: May 22, 2018
    Assignee: Microchip Technology Inc.
    Inventors: Jimes Lei, Ching Chu
  • Publication number: 20180126417
    Abstract: An electrical waveform generating circuit has a pair of Pulse Amplitude Controlled Switching Current Sources (PACS). A gate pulse driver circuit is coupled to an input of each of the pair of PACS for sending gate pulses for driving the pair of PACS. A digital-to-analog converter (DAC) circuit is coupled to the gate pulse driver circuit for controlling amplitudes of the gate pulses. A transducer is coupled to the PACS.
    Type: Application
    Filed: October 3, 2013
    Publication date: May 10, 2018
    Inventors: Jimes LEI, Ching CHU
  • Patent number: 9401659
    Abstract: A high voltage analog switch can be used in medical ultrasound applications. The high voltage analog switch can pass high voltage transducer excitation signals without necessarily having any high voltage power supplies. The high voltage analog switch can include three output switches, with one of the output switches having a clamp circuit for ensuring that transistors of an output switch on an input end of the high voltage analog switch remain OFF when the high voltage analog switch is OFF.
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: July 26, 2016
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Jimes Lei, Kee Chee Tiew
  • Publication number: 20160191036
    Abstract: Described herein are multiple designs for an improved analog switch for use in transmitting high voltage signals without using high voltage power supplies for the switch. The analog switches are able to pass and block input signals in the approximate range of ?100V to +100V. The use of translinear loops and a bootstrap configuration results in a constant on-resistance of the symmetrical switches and matches the conductance of each analog switch to the transconductance of an NMOS transistor, which can be easily stabilized with a constant gm biasing scheme. In certain embodiments, a shunt termination (T-switch) configuration is used for better off-isolation, and each of the symmetrical switches has its own translinear loop and thus flexibility of on-resistance and termination voltage.
    Type: Application
    Filed: October 21, 2015
    Publication date: June 30, 2016
    Inventors: Isaac Ko, Ka Wai Ho, Wan Tim Chan, Jimes Lei
  • Publication number: 20160134199
    Abstract: A high voltage analog switch can be used in medical ultrasound applications. The high voltage analog switch can pass high voltage transducer excitation signals without necessarily having any high voltage power supplies. The high voltage analog switch can include three output switches, with one of the output switches having a clamp circuit for ensuring that transistors of an output switch on an input end of the high voltage analog switch remain OFF when the high voltage analog switch is OFF.
    Type: Application
    Filed: December 8, 2014
    Publication date: May 12, 2016
    Applicant: Monolithic Power Systems, Inc.
    Inventors: Jimes LEI, Kee Chee TIEW
  • Patent number: 9225253
    Abstract: A switching linear amplifier has a DC-DC converter to increase a low input DC voltage to a first high voltage DC. A high voltage high frequency inverter is coupled to the DC-DC converter to generate high voltage pulses. A multistage voltage multiplier is coupled to the high voltage high frequency inverter to generate a second high voltage DC. A controlled charge and discharge circuit is coupled to the multistage voltage multiplier to drive a capacitive load.
    Type: Grant
    Filed: October 23, 2012
    Date of Patent: December 29, 2015
    Assignee: Microchip Technology Inc.
    Inventor: Jimes Lei
  • Publication number: 20150098307
    Abstract: An electrical waveform generating circuit has a pair of Pulse Amplitude Controlled Switching Current Sources (PACS). A gate pulse driver circuit is coupled to an input of each of the pair of PACS for sending gate pulses for driving the pair of PACS. A digital-to-analog converter (DAC) circuit is coupled to the gate pulse driver circuit for controlling amplitudes of the gate pulses. A transducer is coupled to the PACS.
    Type: Application
    Filed: October 3, 2013
    Publication date: April 9, 2015
    Inventors: Jimes LEI, Ching CHU
  • Patent number: 8749294
    Abstract: An integrated single channel or multi-channel ultrasound transmitter that minimizes the number of input connections to a controller such as an FPGA, field programmable gate array, or a custom integrated circuit in an ultrasound system. The method is accomplished by integrating, in low voltage logic, a means to store and or program the patterns required for the transmitter output. The number of logic input connections can be further reduced by further integrating, in low voltage logic, programmable individual time delays and frequency divider for each transmitter output.
    Type: Grant
    Filed: January 7, 2011
    Date of Patent: June 10, 2014
    Assignee: Supertex, Inc.
    Inventor: Jimes Lei
  • Publication number: 20140112024
    Abstract: A switching linear amplifier has a DC-DC converter to increase a low input DC voltage to a first high voltage DC. A high voltage high frequency inverter is coupled to the DC-DC converter to generate high voltage pulses. A multistage voltage multiplier is coupled to the high voltage high frequency inverter to generate a second high voltage DC. A controlled charge and discharge circuit is coupled to the multistage voltage multiplier to drive a capacitive load.
    Type: Application
    Filed: October 23, 2012
    Publication date: April 24, 2014
    Inventor: Jimes Lei
  • Patent number: 8577021
    Abstract: A 5 Ringer Equivalent Number (REN) ringer circuit has a wave generator. A flip-flop is coupled to the wave generator and has a non-inverting and an inverting output. A high voltage level translator is coupled to each of the non-inverting and the inverting outputs of the flip-flop. A source follower buffer is coupled to an output of each of the high voltage level translators.
    Type: Grant
    Filed: March 15, 2010
    Date of Patent: November 5, 2013
    Assignee: Supertex, Inc.
    Inventor: Jimes Lei
  • Patent number: 8254073
    Abstract: A two terminal transmit receive device passes small analog signals with a constant low resistance value to the input of a low noise, low voltage receiver amplifier and can protect the input against the high voltage transmit signals in ultrasound applications without the aid of any power supplies. The device uses depletion-mode transistors that are normally on to pass small analog signal and a voltage detection circuit that quickly turns off the depletion-mode transistors when the presence of high voltage is detected.
    Type: Grant
    Filed: December 21, 2009
    Date of Patent: August 28, 2012
    Assignee: Supertex, Inc.
    Inventors: Benedict C. K. Choy, Jimes Lei
  • Publication number: 20110176390
    Abstract: An integrated single channel or multi-channel ultrasound transmitter that minimizes the number of input connections to a controller such as an FPGA, field programmable gate array, or a custom integrated circuit in an ultrasound system. The method is accomplished by integrating, in low voltage logic, a means to store and or program the patterns required for the transmitter output. The number of logic input connections can be further reduced by further integrating, in low voltage logic, programmable individual time delays and frequency divider for each transmitter output.
    Type: Application
    Filed: January 7, 2011
    Publication date: July 21, 2011
    Inventor: Jimes Lei
  • Patent number: 7813048
    Abstract: An electroactive lens driver comprises a voltage generator generating a high alternating current voltage signal for application to an electroactive lens in response to a low direct current voltage signal. The voltage generator does not include an inductor or a transformer.
    Type: Grant
    Filed: October 28, 2008
    Date of Patent: October 12, 2010
    Assignee: Supertex, Inc.
    Inventors: Scott Lynch, Jimes Lei
  • Patent number: 7564263
    Abstract: A high speed logic signal level shifter is comprised of: a logic signal buffer for receiving logic signal information and having true and complement state differential outputs; a binary flip-flop circuit with set and reset inputs; a first coupling capacitor connected from the true buffer output to the set input of the binary flip-flop circuit; and a second coupling capacitor connected from the complement buffer output to the reset input of the binary flip-flop circuit. The high speed logic signal level shifter transfers a fast logic signal across a high voltage difference by making use of rapid voltage changes transmitted through small capacitors. The signal changes carried by the capacitors are about 10 times faster than any expected voltage transient on VPP or VNN. Furthermore, the differential coupling circuit is used to provide enhanced protection against undesired circuit switching during supply voltage changes.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: July 21, 2009
    Assignee: Supertex, Inc.
    Inventors: James T. Walker, Jimes Lei
  • Patent number: 7554272
    Abstract: An EL driver circuit has a full H-bridge circuit. A boost converter is coupled to the full H-bridge circuit. The boost converter is pulse width modulated to generate a gradual increase in voltage to be applied to the full H-bridge circuit to drive an EL lamp.
    Type: Grant
    Filed: February 20, 2007
    Date of Patent: June 30, 2009
    Assignee: Supertex, Inc.
    Inventor: Jimes Lei
  • Publication number: 20090110384
    Abstract: An electroactive lens driver comprises a voltage generator generating a high alternating current voltage signal for application to an electroactive lens in response to a low direct current voltage signal. The voltage generator does not include an inductor or a transformer.
    Type: Application
    Filed: October 28, 2008
    Publication date: April 30, 2009
    Applicant: Supertex, Inc.
    Inventors: Scott Lynch, Jimes Lei
  • Patent number: 7480191
    Abstract: A circuit for transmitting logic signals across a high voltage barrier has a logic signal buffer with true and complement state differential outputs. A binary flip-flop with set and reset inputs is further provided. A first coupling capacitor is coupled to the true buffer output and to the set input of the binary flip-flop. A second coupling capacitor is coupled to the complement buffer output and to the reset input of the binary flip-flop circuit.
    Type: Grant
    Filed: September 11, 2006
    Date of Patent: January 20, 2009
    Assignee: Supertex, Inc.
    Inventors: James T. Walker, Jimes Lei
  • Publication number: 20070200508
    Abstract: An EL driver circuit has a full H-bridge circuit. A boost converter is coupled to the full H-bridge circuit. The boost converter is pulse width modulated to generate a gradual increase in voltage to be applied to the full H-bridge circuit to drive an EL lamp.
    Type: Application
    Filed: February 20, 2007
    Publication date: August 30, 2007
    Inventor: Jimes Lei
  • Publication number: 20070085584
    Abstract: A circuit for transmitting logic signals across a high voltage barrier has a logic signal buffer with true and complement state differential outputs. A binary flip-flop with set and reset inputs is further provided. A first coupling capacitor is coupled to the true buffer output and to the set input of the binary flip-flop. A second coupling capacitor is coupled to the complement buffer output and to the reset input of the binary flip-flop circuit.
    Type: Application
    Filed: September 11, 2006
    Publication date: April 19, 2007
    Inventors: James Walker, Jimes Lei
  • Publication number: 20060238527
    Abstract: A high speed logic signal level shifter is comprised of: a logic signal buffer for receiving logic signal information and having true and complement state differential outputs; a binary flip-flop circuit with set and reset inputs; a first coupling capacitor connected from the true buffer output to the set input of the binary flip-flop circuit; and a second coupling capacitor connected from the complement buffer output to the reset input of the binary flip-flop circuit. The high speed logic signal level shifter transfers a fast logic signal across a high voltage difference by making use of rapid voltage changes transmitted through small capacitors. The signal changes carried by the capacitors are about 10 times faster than any expected voltage transient on VPP or VNN. Furthermore, the differential coupling circuit is used to provide enhanced protection against undesired circuit switching during supply voltage changes.
    Type: Application
    Filed: April 20, 2006
    Publication date: October 26, 2006
    Inventors: James Walker, Jimes Lei