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公开(公告)号：US11177776B2
公开(公告)日：2021-11-16
申请号：US16654527
申请日：2019-10-16
发明人： Jong Ok Ha , Byeong Hak Jo , Jeong Hoon Kim , Young Wong Jang , Shinichi Iizuka
摘要： A bias timing control circuit includes a current source, a bias switch circuit, a duty cycle sensing circuit, and a switching control circuit. The bias switch circuit includes a first path switch, connected between an output node of the current source and a bias amplifying circuit, and a second path switch, connected between the output node of the current source and a temperature compensation circuit. The duty cycle sensing circuit is configured to generate a timing control signal based on a duty cycle of a transmission enable signal. The switching control circuit is configured to control a first turn-on time of the first path switch during an initial startup period, and a second turn-on time of the second path switch during a normal driving period subsequent to the initial startup period to adjust a warm-up time of a power amplifying circuit based on the timing control signal.
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公开(公告)号：US11121679B2
公开(公告)日：2021-09-14
申请号：US16452986
申请日：2019-06-26
发明人： Young Wong Jang , Byeong Hak Jo , Jeong Hoon Kim , Jong Ok Ha , Hyun Paek , Shinichi Iizuka
摘要： An amplifying apparatus is provided. The amplifying apparatus comprises an amplifying circuit comprising a power amplifier and a bias circuit, the bias circuit is configured to detect an ambient temperature of the power amplifier to output a temperature voltage and regulate an internal current based on an input control signal to supply a bias current obtained by the regulation to the power amplifier; and a temperature control circuit that generates the control signal based on the temperature voltage during initial driving from a transmission mode starting point in time to an input point in time at which an input signal is input and outputting the control signal to the amplifying circuit.
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公开(公告)号：US10110259B1
公开(公告)日：2018-10-23
申请号：US15815253
申请日：2017-11-16
发明人： Byeong Hak Jo , Jeong Hoon Kim , Hyun Paek , Young Wong Jang
摘要： A band selection switch apparatus includes: a first switch including a first series switch disposed between a transmission input terminal and a first transmission and reception terminal; a second switch including a second series switch disposed between the transmission input terminal and a first transmission terminal; and a third switch including a third series switch disposed between a first reception output terminal and the first transmission and reception terminal. The first series switch includes a first series switch circuit including first series switch elements connected between the transmission input terminal and a first intermediate node, a second series switch circuit including second series switch elements connected between the first intermediate node and the first transmission and reception terminal, and a first shunt switch circuit including first shunt switch elements connected between the first intermediate node and a ground.
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公开(公告)号：US11431298B2
公开(公告)日：2022-08-30
申请号：US17005369
申请日：2020-08-28
发明人： Jong Ok Ha , Iizuka Shinichi , Kwang Du Lee , Jeong Hoon Kim , Young Wong Jang
摘要： An apparatus that generates and limits a bias current of a power amplifier is provided. The apparatus includes a bias current circuit that generates a bias current to bias the power amplifier, and critically limit an increase in bias current, and a band gap reference circuit that provides a reference voltage or a reference current to the bias current circuit. The bias current circuit is configured to critically limit the increase in bias current, as a first bias transistor that generates the bias current is converted from a triode region to a saturation region, based on the reference voltage or the reference current.
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公开(公告)号：US10148298B2
公开(公告)日：2018-12-04
申请号：US15667808
申请日：2017-08-03
发明人： Byeong Hak Jo , Jeong Hoon Kim , Hyun Paek , Young Wong Jang
IPC分类号： H03K17/687 , H04B1/10 , H01P1/15 , H03K17/16 , H04B1/50
摘要： A radio frequency switch apparatus includes a radio frequency switch, a dynamic bias circuit, and a switch control circuit. The radio frequency switch includes a first radio frequency switch circuit connected between a first signal terminal and an input terminal. The first radio frequency switch circuit includes a series switch and a shunt switch. The dynamic bias circuit is configured to generate a bias voltage and a buffer voltage lower than a battery voltage by a preset voltage, using the battery voltage and configured to output the bias voltage to a signal line connected to the input terminal. The switch control circuit is configured to generate first and second gate voltages to switch the first radio frequency switch circuit, based on a band selection signal, using the battery voltage and the buffer voltage.
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