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公开(公告)号：US20160308491A1
公开(公告)日：2016-10-20
申请号：US15101646
申请日：2014-12-10
发明人： Christian ELGAARD
摘要： An oscillator circuit comprises a first, high-Q crystal oscillator and a second, low-Q oscillator arranged for kick-starting the crystal oscillator at switch-on by coupling the second oscillator to the first oscillator for a time period. The oscillator circuit is arranged to select the frequency of the second oscillator by placing the second oscillator in a phase locked loop with the first oscillator providing a reference frequency, and adjusting the frequency of the second oscillator towards the frequency of the first oscillator.
摘要翻译： 振荡器电路包括第一高Q晶体振荡器和第二低Q振荡器，其布置成在接通时通过将第二振荡器耦合到第一振荡器一段时间来启动晶体振荡器。 振荡器电路被布置成通过将第二振荡器放置在锁相环中来选择第二振荡器的频率，第一振荡器提供参考频率，并且将第二振荡器的频率调整到第一振荡器的频率。
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公开(公告)号：US20240267011A1
公开(公告)日：2024-08-08
申请号：US18635728
申请日：2024-04-15
发明人： Christian ELGAARD , Henrik SJÖLAND
IPC分类号： H03F3/24
CPC分类号： H03F3/245 , H03F2200/451
摘要： A bias circuit for a PA. A first transistor has its drain terminal and its gate terminal connected to a first circuit node and its source terminal connected to a first supply terminal, a first current source connected to the first circuit node, and a first resistor connected between the first and second circuit nodes. A second transistor receives a first component of a differential input signal to the PA at its gate terminal, has its drain terminal connected to the second circuit node and its source terminal connected to a second supply terminal, and a third transistor receives a second component of the differential input signal to the PA at its gate terminal, having its drain terminal connected to the second circuit node and its source terminal connected to a second supply terminal. The gates terminals of the second and third transistors are biased by a first voltage.
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公开(公告)号：US20230344462A1
公开(公告)日：2023-10-26
申请号：US18245964
申请日：2020-09-30
发明人： Imad ud Din , Christian ELGAARD , Stefan ANDERSSON
IPC分类号： H04B1/44
CPC分类号： H04B1/44
摘要： A transceiver switch circuitry having an antenna port, a receiver port, a first transmitter port and a second transmitter port. The transceiver switch circuitry is configured to be operable in a reception mode to allow reception signals at the antenna port to be forwarded to the receiver port, and in a transmission mode to allow transmission signals, having a center frequency with a wavelength λ, at the first transmitter port and the second transmitter port to be forwarded to the antenna port for transmission. The transceiver switch circuitry has a receive arrangement including a first λ/4 impedance transformer and a first switch circuitry configured to ground the first λ/4 impedance transformer at the receiver port in the transmission mode; and a transmit arrangement having a second λ/4 impedance transformer and a second switch circuitry configured to ground a second side of the second λ/4 impedance transformer in the reception mode.
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公开(公告)号：US20240014846A1
公开(公告)日：2024-01-11
申请号：US18252617
申请日：2020-11-27
发明人： Imad ud DIN , Christian ELGAARD
摘要： A differential transceiver switch circuitry having an antenna port, a positive and a negative receiver port, a first positive and a first negative amplifier port and at least one second positive and negative second amplifier port. The differential transceiver switch circuitry is configured to operate in a reception mode to allow reception signals at the antenna port to be transferred to the positive and negative receiver port and in a transmission mode to allow transmission signals at the first positive and first negative amplifier port and at the second positive and second negative amplifier port to be transferred to the antenna port. The differential transceiver switch circuitry, has a transmit arrangement and a receive arrangement having receiver switch circuitry configured to prevent transmission signals from entering the receive arrangement in the transmission mode.
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公开(公告)号：US20220123697A1
公开(公告)日：2022-04-21
申请号：US17421289
申请日：2019-08-29
发明人： Christian ELGAARD , Henrik SJÖLAND
IPC分类号： H03F3/24
摘要： A bias circuit for a PA. A first transistor has its drain terminal and its gate terminal connected to a first circuit node and its source terminal connected to a first supply terminal, a first current source connected to the first circuit node, and a first resistor connected between the first and second circuit nodes. A second transistor receives a first component of a differential input signal to the PA at its gate terminal, has its drain terminal connected to the second circuit node and its source terminal connected to a second supply terminal, and a third transistor receives a second component of the differential input signal to the PA at its gate terminal, having its drain terminal connected to the second circuit node and its source terminal connected to a second supply terminal. The gates terminals of the second and the third transistors are biased by a first voltage.
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公开(公告)号：US20230421184A1
公开(公告)日：2023-12-28
申请号：US18003026
申请日：2020-06-22
发明人： Christian ELGAARD , Henrik SJÖLAND
CPC分类号： H04B1/04 , H03F3/24 , H03G3/3042 , H03F1/3241 , H04B2001/0408 , H03F2200/102
摘要： A transmitter circuit has a signal input for receiving an analog input signal and a local oscillator (LO) input for receiving an LO signal. A mixer circuit has a first input, a second input, and an output. The second input of the mixer circuit is connected to a signal input of the transmitter circuit. A PA circuit has an input connected to the output of the mixer circuit, and an output. A control circuit generates a phase-control signal and a gain-control signal in response to an envelope of the analog input signal. A phase-control circuit generates a phase-adjusted LO signal in response to the LO signal and the phase-control signal and supplies the phase-adjusted LO signal to the first input of the mixer circuit. A gain-control circuit controls a gain of the transmitter circuit in response to the gain-control signal.
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公开(公告)号：US20230353187A1
公开(公告)日：2023-11-02
申请号：US18245985
申请日：2020-09-30
发明人： Imad ud Din , Christian ELGAARD , Stefan ANDERSSON
CPC分类号： H04B1/44 , H04B1/0053 , H04B1/54
摘要： Transceiver switch circuitry having an antenna port, a receiver port and two transmitter ports. The transceiver switch circuitry is configured to be operable in a reception mode to allow reception signals at the antenna port to be forwarded to the receiver port, and in a transmission mode to allow transmission signals, having a center frequency with a wavelength λ, at the first transmitter port and the second transmitter port to be forwarded to the antenna port for transmission. The transceiver switch circuitry includes a receive arrangement comprising having a receiver λ/4 impedance transformer and a receiver switch circuitry configured to ground the first λ/4 impedance transformer at the receiver port in the transmission mode; and a transmit arrangement comprising having three transmitter impedance transformers and a first and second transmitter switch circuitry configured to virtually ground a second side of the first λ/4 impedance transformer in the reception mode.
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公开(公告)号：US20230179237A1
公开(公告)日：2023-06-08
申请号：US17919526
申请日：2020-04-17
IPC分类号： H04B1/04
CPC分类号： H04B1/0458 , H04B2001/0408
摘要： The present invention relates inter alia to a transmitter arrangement (1), in particular for radio communication, comprising at least two antenna elements (31, 32), spaced apart by a defined distance and a differential output amplifier (20) with a first output (21) coupled to a first (31) of the at least two antenna elements (31, 32) and with a second inverted output (22) coupled to a second (32) of the at least two antenna elements (31, 32). A first transmission line element (50) is arranged between at least one of the first and second outputs (21, 22) and the respective one of the at least two antenna elements (31, 32) and is configured such that signals applied to respective input taps (310, 320) of the at least two antenna elements (31, 32) are substantially in-phase with each other.
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公开(公告)号：US20230179150A1
公开(公告)日：2023-06-08
申请号：US17923989
申请日：2020-05-14
CPC分类号： H03F1/0288 , H03F1/0227 , H03F3/245 , H04B1/0483 , H03F2200/102 , H04B2001/0408
摘要： 17 ABSTRACT A transmitter and Doherty power amplifier configured for envelope-controlled biasing of an auxiliary transmitter of the Doherty power amplifier are disclosed. According to one aspect, a transmitter having a main amplifier in a main signal path and an auxiliary amplifier in an auxiliary signal path is provided. The auxiliary amplifier is configured to be activated only when an envelope of an input signal of the transmitter exceeds a power threshold. The transmitter also includes at least one component in the auxiliary signal path configured to be deactivated when the auxiliary amplifier is deactivated, the at least one component including at least one of a pre-power amplifier, a mixer and a local oscillator buffer.
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