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1. 发明申请

US20210203374A1 Hybrid Coupler Based T/R Switch 有权
公开(公告)号：US20210203374A1
公开(公告)日：2021-07-01
申请号：US17141857
申请日：2021-01-05
申请人： pSemi Corporation
发明人： Kashish Pal , Vikas Sharma , Sebastian Diebold , Leland Gilreath , Daoud Salameh , Farshid Aryanfar
IPC分类号： H04B1/44 , H03F3/19
摘要： A hybrid coupler-based T/R switch for use in a TDM system. An output hybrid coupler of a balanced amplifier is used to selectively switch a transmit or receive path to an antenna. During transmission, power at the output of the balanced amplifier is delivered directly to the antenna. During reception, power from the antenna is reflected through ports of the hybrid coupler connected to respective two amplifiers of the balanced amplifier, to constructively combine at a port of the coupler coupled to the receive path, with a ninety degrees phase shift. A pair of shunting switches or series switches coupled to the ports of the hybrid coupler connected to the two amplifiers, and a shunting switch coupled to the port coupled to the receive path, control operation of the hybrid coupler-based T/R switch. An additional switch coupled to the port of the coupler that is coupled to the receive path can provide a bypass path for reception or transmission through the antenna while bypassing the balanced amplifier of the transmit path and an amplifier of the receive path.

2. 发明授权

US10141888B2 Double balanced mixer 有权
公开(公告)号：US10141888B2
公开(公告)日：2018-11-27
申请号：US15676675
申请日：2017-08-14
申请人： pSemi Corporation
发明人： Daoud Salameh
IPC分类号： H03D7/14 , H01L23/66 , H01L27/06 , H01L27/12 , H01L27/092 , H01L29/78 , H01L29/786 , H01L21/84 , H01L21/86 , H01L21/8238 , H03D7/02
摘要： A FET based double balanced mixer (DBM) that exhibits good conversion gain and IIP3 values and provides improved linearity and wide bandwidth. In one embodiment, a first balun is configured to receive a local oscillator (LO) signal and generate two balanced LO signals that are coupled to two corresponding opposing nodes of a four-node FET ring. A second balun is configured to pass an RF signal on the unbalanced side. The FET ring includes at least four FETs connected as branches of a ring, with the source of each FET connected to the drain of a next FET in the ring. Each FET is preferably fabricated as, or configured as, a low threshold voltage device having its gate connected to its drain, which causes the FET to operate as a diode, but with the unique characteristic of having close to a zero turn-on voltage.

3. 发明申请

US20220247358A1 Power Amplifier Equalizer 有权
公开(公告)号：US20220247358A1
公开(公告)日：2022-08-04
申请号：US17165198
申请日：2021-02-02
申请人： pSemi Corporation
发明人： Daoud Salameh
IPC分类号： H03F1/02 , H03F1/32 , H03F3/213 , H03F3/45
摘要： Circuits and methods for achieving good AM-AM and AM-PM metrics while achieving good power, PAE, linearity, and EVM performance in an amplifier. Embodiments provide an equalization approach which compensates for AM-AM and AM-PM variations in an amplifier by controlling bias voltage versus output power to alter the AM-AM and AM-PM profiles imposed by the amplifier. Differential amplifier embodiments include cross-coupled common-gate transistors that generate an equalization voltage that alters the gate bias voltage of respective main FETs in proportion to a power level present at the respective drains of the main FETs. Single-ended amplifier embodiments include an equalization circuit that alters the bias voltage to the gate of a main FET in proportion to a power level present at the main FET drain. Embodiments may also include a linearization circuit which alters the AM-PM profile of an input signal to compensate for the AM-PM profile imposed by a coupled amplifier.

4. 发明授权

US11606068B2 Power amplifier linearizer 有权
公开(公告)号：US11606068B2
公开(公告)日：2023-03-14
申请号：US17165493
申请日：2021-02-02
申请人： pSemi Corporation
发明人： Daoud Salameh
IPC分类号： H03F1/32 , H03F3/21
摘要： Circuits and methods for achieving good amplifier AM-AM and AM-PM metrics while achieving good power, PAE, linearity, and EVM performance. Embodiments compensate for a non-linear distortion profile (e.g., an AM-PM and/or AM-AM profile) in an amplifier by pre-processing an input signal, such as a radio-frequency signal, to alter the non-linear distortion profile of the input signal so as to compensate for the non-linear distortion profile imposed by a coupled device, such as an amplifier. An inventive aspect includes linearizing an output from an amplifier having a first non-linear distortion profile, including passing an input signal having a second non-linear distortion profile through a reflective hybrid coupler to a non-linear termination circuit, and reflecting a modified input signal from the non-linear termination circuit back through the reflective hybrid coupler as an output signal, the output signal having a third non-linear distortion profile shaped to compensate for the first non-linear distortion profile.

5. 发明申请

US20220247361A1 Power Amplifier Linearizer 有权
公开(公告)号：US20220247361A1
公开(公告)日：2022-08-04
申请号：US17165493
申请日：2021-02-02
申请人： pSemi Corporation
发明人： Daoud Salameh
IPC分类号： H03F1/32 , H03F3/21
摘要： Circuits and methods for achieving good amplifier AM-AM and AM-PM metrics while achieving good power, PAE, linearity, and EVM performance. Embodiments compensate for a non-linear distortion profile (e.g., an AM-PM and/or AM-AM profile) in an amplifier by pre-processing an input signal, such as a radio-frequency signal, to alter the non-linear distortion profile of the input signal so as to compensate for the non-linear distortion profile imposed by a coupled device, such as an amplifier. An inventive aspect includes linearizing an output from an amplifier having a first non-linear distortion profile, including passing an input signal having a second non-linear distortion profile through a reflective hybrid coupler to a non-linear termination circuit, and reflecting a modified input signal from the non-linear termination circuit back through the reflective hybrid coupler as an output signal, the output signal having a third non-linear distortion profile shaped to compensate for the first non-linear distortion profile.

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