Patents by Inventor Thomas Byunghak Cho
Thomas Byunghak Cho 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).
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Patent number: 10009201Abstract: A wireless terminal and a receiver are provided that include a first amplifier configured to receive and amplify a first radio frequency (RF) input signal, and configured to output a first RF output signal corresponding to a first carrier included in a first frequency band. The receiver also includes a first sub amplifier configured to, when a mode signal indicates a first mode, receive a first internal signal from the first amplifier, amplify the first internal signal, and output a second RF output signal corresponding to a second carrier included in the first frequency band.Type: GrantFiled: January 13, 2016Date of Patent: June 26, 2018Assignee: Samsung Electronics Co., LtdInventors: Young-min Kim, Pil-sung Jang, Thomas Byunghak Cho, Seung-chan Heo
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Patent number: 9948301Abstract: An integrated circuit (IC), a method of testing the IC, and a method of manufacturing the IC are provided. The IC includes analog circuitry, digital circuitry, at least one first connector, and a switching unit operatively coupled with the at least one first connector and configured to, if a first signal is received, couple the analog circuitry and the at least one first connector, and, if a second signal is received, couple the digital circuitry and the at least one first connector.Type: GrantFiled: July 15, 2016Date of Patent: April 17, 2018Assignee: Samsung Electronics Co., LtdInventors: Sangwook Han, Thomas Byunghak Cho, Jaehyun Lim, Sung-Jun Lee, Joonhee Lee, Jongwon Choi
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Patent number: 9859847Abstract: A parallel output linear amplifier is provided that includes a transconductance amplifier configured to receive an analog input signal from an input terminal and amplify the analog input signal. The parallel output linear amplifier also includes a first pre-amplifier connected to the transconductance amplifier and operated using a floating drive voltage, and a cascode class AB amplifier connected to the first pre-amplifier and configured to provide an amplified signal to an output terminal. The parallel output linear amplifier further includes a second pre-amplifier configured connected to the transconductance amplifier and operated using the floating drive voltage, and a cascade class AB amplifier connected to the second pre-amplifier and configured to provide an amplified signal to the output terminal.Type: GrantFiled: September 2, 2015Date of Patent: January 2, 2018Assignee: Samsung Electronics Co., LtdInventors: Ji-Seon Paek, Seung-Chul Lee, Young-Hwan Choo, Sung-Jun Lee, Jun-Hee Jung, Thomas Byunghak Cho, Jeong-Hyun Choi
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Patent number: 9774338Abstract: The present invention relates to a digital-analog conversion method and device for adjusting a reference current to be used in a digital-analog conversion, by using a common mode feedback device, and the digital-analog conversion method of the present invention comprises the steps of: generating a reference current by receiving a reference voltage; converting a digital signal into an analog signal by receiving the generated reference current; detecting a common mode voltage, which is the average value of a both-end voltage of the converted analog signal; comparing the detected common mode voltage with the reference voltage; generating a feedback signal on the basis of the comparison result; and adjusting the reference current according to the generated feedback signal.Type: GrantFiled: June 2, 2015Date of Patent: September 26, 2017Assignee: Samsung Electronics Co., Ltd.Inventors: Jongwoo Lee, Thomas Byunghak Cho
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Publication number: 20170201263Abstract: The present invention relates to a digital-analog conversion method and device for adjusting a reference current to be used in a digital-analog conversion, by using a common mode feedback device, and the digital-analog conversion method of the present invention comprises the steps of: generating a reference current by receiving a reference voltage; converting a digital signal into an analog signal by receiving the generated reference current; detecting a common mode voltage, which is the average value of a both-end voltage of the converted analog signal; comparing the detected common mode voltage with the reference voltage; generating a feedback signal on the basis of the comparison result; and adjusting the reference current according to the generated feedback signal.Type: ApplicationFiled: June 2, 2015Publication date: July 13, 2017Applicant: Samsung Electronics Co., Ltd.Inventors: Jongwoo LEE, Thomas Byunghak CHO
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Publication number: 20170187332Abstract: An apparatus for and method of a supply modulator (SM) for a power amplifier (PA) is provided. The apparatus includes a buck-boost converter, including a supply input connected to a battery voltage (Vbat), and an output; and a buck converter, including a supply input connected to Vbat, an input connected to the output of the buck-boost converter, and an output.Type: ApplicationFiled: March 15, 2017Publication date: June 29, 2017Inventors: Yong Sik YOUN, Seung Chul Lee, Ji Seon Paek, Thomas Byunghak Cho
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Publication number: 20170085224Abstract: An apparatus for and method of a supply modulator (SM) for a power amplifier (PA) is provided. The apparatus includes a buck-boost converter, including a supply input connected to a battery voltage (Vbat), and an output; a switch and capacitors module, including a first input connected to the output of the buck-boost converter, and a second input; a buck (dual) converter, including a supply input connected to Vbat, an input connected to the output of the buck-boost converter, and an output connected to the second input of the switch and capacitors module; a linear amplifier (LA), including a supply input connected to the output of the buck-boost converter, an input, and an output connected to the second input of the switch and capacitors module; and the PA, including a supply input connected to the output of the buck (dual converter, an input for receiving a radio frequency (RF) signal, and an output for outputting an RF signal.Type: ApplicationFiled: November 30, 2015Publication date: March 23, 2017Inventors: Yong Sik YOUN, Seung Chul LEE, Ji Seon PAEK, Thomas Byunghak CHO
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Patent number: 9602057Abstract: An apparatus for and method of a supply modulator (SM) for a power amplifier (PA) is provided. The apparatus includes a buck-boost converter, including a supply input connected to a battery voltage (Vbat), and an output; a switch and capacitors module, including a first input connected to the output of the buck-boost converter, and a second input; a buck (dual) converter, including a supply input connected to Vbat, an input connected to the output of the buck-boost converter, and an output connected to the second input of the switch and capacitors module; a linear amplifier (LA), including a supply input connected to the output of the buck-boost converter, an input, and an output connected to the second input of the switch and capacitors module; and the PA, including a supply input connected to the output of the buck (dual converter, an input for receiving a radio frequency (RF) signal, and an output for outputting an RF signal.Type: GrantFiled: November 30, 2015Date of Patent: March 21, 2017Assignee: Samsung Electronics Co., LtdInventors: Yong Sik Youn, Seung Chul Lee, Ji Seon Paek, Thomas Byunghak Cho
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Publication number: 20170026041Abstract: An integrated circuit (IC), a method of testing the IC, and a method of manufacturing the IC are provided. The IC includes analog circuitry, digital circuitry, at least one first connector, and a switching unit operatively coupled with the at least one first connector and configured to, if a first signal is received, couple the analog circuitry and the at least one first connector, and, if a second signal is received, couple the digital circuitry and the at least one first connector.Type: ApplicationFiled: July 15, 2016Publication date: January 26, 2017Inventors: Sangwook HAN, Thomas Byunghak CHO, Jaehyun LIM, Sung-Jun LEE, Joonhee LEE, Jongwon CHOI
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Patent number: 9525384Abstract: A method and a supply modulator (SM) are provided for supplying power from a wireless transmitter to a radio frequency (RF) power amplifier. A power control signal input from a modem is received. A reference voltage is determined. An operating mode of the SM is changed by controlling a level of the reference voltage. A voltage is determined based on the level of a reference voltage. When the operating mode of the SM is an ET mode, a first output signal from a linear regulator and a second output signal from a switching regulator are combined to obtain a combined result, and the combined result is output. The first output signal is based on the voltage. When the operating mode of the SM is an APT mode, the voltage based on the reference voltage is output.Type: GrantFiled: September 2, 2015Date of Patent: December 20, 2016Assignee: Samsung Electronics Co., LtdInventors: Sung-Jun Lee, Ji-Seon Paek, Seung-Chul Lee, Yong-Sik Youn, Jun-Hee Jung, Thomas Byunghak Cho, Sang-Wook Han
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Patent number: 9490829Abstract: An electronic device for synthesizing a frequency is provided. The electronic device includes a bank changer configured to output a channel code corresponding to a reference frequency signal and a feedback frequency signal, a channel code mapper configured to generate a changed channel code by applying an offset to the channel code output from the bank changer, and a voltage controlled oscillator configured to control a total capacitance of a plurality of capacitors based on the changed channel code and to oscillate a frequency dependent on the total capacitance.Type: GrantFiled: April 3, 2014Date of Patent: November 8, 2016Assignee: Samsung Electronics Co., Ltd.Inventors: Sang-Wook Han, Sung-Jun Lee, In-Yup Kang, Thomas Byunghak Cho, Joon-Hee Lee, Si-Bum Jun, Jong-Won Choi
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Publication number: 20160309535Abstract: Disclosed are a transmitter and method of combining multiple contiguous and non-contiguous frequency bands in a wireless communication system using carrier aggregation. The transmitter includes a first communication unit for converting a first baseband signal into a first RF signal of a first band, a second communication unit for converting a second baseband signal into a second RF signal of a second band, a combiner for outputting a third RF signal by combining the first RF signal and the second RF signal, and an amplifier for amplifying the third RF signal.Type: ApplicationFiled: April 18, 2016Publication date: October 20, 2016Inventors: Seongsik MYOUNG, Thomas Byunghak CHO, Seungchan HEO
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Publication number: 20160204966Abstract: A wireless terminal and a receiver are provided that include a first amplifier configured to receive and amplify a first radio frequency (RF) input signal, and configured to output a first RF output signal corresponding to a first carrier included in a first frequency band. The receiver also includes a first sub amplifier configured to, when a mode signal indicates a first mode, receive a first internal signal from the first amplifier, amplify the first internal signal, and output a second RF output signal corresponding to a second carrier included in the first frequency band.Type: ApplicationFiled: January 13, 2016Publication date: July 14, 2016Inventors: Young-min Kim, Pil-sung Jang, Thomas Byunghak Cho, Seung-chan Heo
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Publication number: 20160065139Abstract: A method and a supply modulator (SM) are provided for supplying power from a wireless transmitter to a radio frequency (RF) power amplifier. A power control signal input from a modem is received. A reference voltage is determined. An operating mode of the SM is changed by controlling a level of the reference voltage. A voltage is determined based on the level of a reference voltage. When the operating mode of the SM is an ET mode, a first output signal from a linear regulator and a second output signal from a switching regulator are combined to obtain a combined result, and the combined result is output. The first output signal is based on the voltage. When the operating mode of the SM is an APT mode, the voltage based on the reference voltage is output.Type: ApplicationFiled: September 2, 2015Publication date: March 3, 2016Inventors: Sung-Jun LEE, Ji-Seon Paek, Seung-Chul Lee, Yong-Sik Youn, Jun-Hee Jung, Thomas Byunghak Cho, Sang-Wook Han
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Publication number: 20160065142Abstract: A parallel output linear amplifier is provided that includes a transconductance amplifier configured to receive an analog input signal from an input terminal and amplify the analog input signal. The parallel output linear amplifier also includes a first pre-amplifier connected to the transconductance amplifier and operated using a floating drive voltage, and a cascode class AB amplifier connected to the first pre-amplifier and configured to provide an amplified signal to an output terminal. The parallel output linear amplifier further includes a second pre-amplifier configured connected to the transconductance amplifier and operated using the floating drive voltage, and a cascade class AB amplifier connected to the second pre-amplifier and configured to provide an amplified signal to the output terminal.Type: ApplicationFiled: September 2, 2015Publication date: March 3, 2016Inventors: Ji-Seon PAEK, Seung-Chul LEE, Young-Hwan CHOO, Sung-Jun LEE, Jun-Hee JUNG, Thomas Byunghak CHO, Jeong-Hyun CHOI
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Publication number: 20140300390Abstract: An electronic device for synthesizing a frequency is provided. The electronic device includes a bank changer configured to output a channel code corresponding to a reference frequency signal and a feedback frequency signal, a channel code mapper configured to generate a changed channel code by applying an offset to the channel code output from the bank changer, and a voltage controlled oscillator configured to control a total capacitance of a plurality of capacitors based on the changed channel code and to oscillate a frequency dependent on the total capacitance.Type: ApplicationFiled: April 3, 2014Publication date: October 9, 2014Applicant: Samsung Electronics Co., Ltd.Inventors: Sang-Wook HAN, Sung-Jun LEE, In-Yup KANG, Thomas Byunghak CHO, Joon-Hee LEE, Si-Bum JUN, Jong-Won CHOI
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Patent number: 6127887Abstract: A low noise amplifier circuit provides high gain and an input impedance matching a source output impedance by combining two amplifiers having different operational characteristics in parallel. The amplifier circuit includes a first amplifier having an input impedance matching a source and a gain less than a system requirement and a second amplifier having a gain meeting the system requirement and an input impedance substantially higher than the input impedance of the first amplifier, the second amplifier being connected in parallel to the first amplifier. The first amplifier includes an input and an output and the second amplifier includes an input and an output, the input to the first amplifier and the input to the second amplifier being connected to the source. A summer is provided for combining an output signal from the first amplifier with an output of the second amplifier.Type: GrantFiled: July 23, 1998Date of Patent: October 3, 2000Assignee: Level One Communications, Inc.Inventor: Thomas Byunghak Cho