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公开(公告)号：US20240372513A1
公开(公告)日：2024-11-07
申请号：US18771880
申请日：2024-07-12
Applicant: pSemi Corporation
Inventor： Rong JIANG , Parvez DARUWALLA , Khushali SHAH
Abstract: Methods and devices to support multiple gain states in amplifiers are described. The methods and devices are based on implementing a feedback element in the amplifier and adjusting the impedance of the feedback element to provide a desired gain while maintaining the overall performance of the amplifier and reducing degradation of the S12 parameter. The feedback element includes an adjustable attenuator and a tunable resistive element. The adjustable attenuator is provided in a path that is common to the feedback path and the bypass path of the amplifier. Exemplary implementations of adjustable attenuators are also presented.
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公开(公告)号：US20210083631A1
公开(公告)日：2021-03-18
申请号：US16743638
申请日：2020-01-15
Applicant: pSemi Corporation
Inventor： Parvez DARUWALLA , David KOVAC
Abstract: Various methods and circuital arrangements for protection of an RF amplifier are presented. According to one aspect, the RF amplifier is part of switchable RF paths that may include at least one path with one or more attenuators or switches that can be used during normal operation to define different modes of operation of the at least one path. An RF level detector monitors a level of an RF signal during operation of any one of the switchable RF paths and may control the attenuators or switches to provide an attenuation of the RF signal according to a desired level of protection at an input and/or output of the RF amplifier. According to another aspect, the RF level detector may control a switch to force the RF signal through a different switchable RF path.
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公开(公告)号：US20250132756A1
公开(公告)日：2025-04-24
申请号：US18964292
申请日：2024-11-29
Applicant: pSemi Corporation
Inventor： Joseph Porter SLATON , Parvez DARUWALLA
IPC: H03K17/041
Abstract: Methods and devices to reduce the switching time of radio frequency (RF) switches including antenna switches are disclosed. The disclosed teachings include selective bypassing of the capacitive and resistive elements of the circuit during the transition of RF switches from one state to another. Several implementations of the disclosed methods and devices are also presented.
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公开(公告)号：US20240137059A1
公开(公告)日：2024-04-25
申请号：US18499138
申请日：2023-10-30
Applicant: pSemi Corporation
Inventor： Parvez DARUWALLA , Sung Kyu HAN
CPC classification number: H04B1/1615 , H03F3/195 , H03G3/3052 , H04B1/18 , H03F2200/294
Abstract: Methods and devices for limiting the power level of low noise amplifiers (LNA) implemented in radio frequency (RF) receiver front-ends. The described methods are applicable to bypass, low and high gain modes of the LNA. According to the described methods, the decoder allows the signal to be clamped before or after being attenuated. The benefit of such methods is to improve large signal performances (e.g. IIP3, P1dB) of the RF receiver front-end, while still meeting the clamping requirements, or improve (lower) clamped output power, while still meeting large signal performances (e.g. IIP3, P1dB).
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公开(公告)号：US20240113734A1
公开(公告)日：2024-04-04
申请号：US18477244
申请日：2023-09-28
Applicant: pSemi Corporation
Inventor： Parvez DARUWALLA
CPC classification number: H04B1/0078 , H04B1/0458 , H04B1/66
Abstract: Methods and devices to control radiated spurious emission (RSE) in an RF antenna switch are presented. The RF antenna switch includes a through stack that includes at least one regular N-type FET transistor and a plurality of intrinsic N-type FET transistors, and a shunt stack that includes a plurality of intrinsic N-type FET transistors. During an inactive mode of operation, the regular transistor turns OFF to present a high impedance. The RF antenna switch includes a termination stack having a plurality of regular P-type FET transistors that are activated during the inactive mode to present a termination impedance to the antenna. A bias signal generator that remains partially active during the inactive mode of operation to generate positive and negative control voltages having magnitudes that are sufficiently high to maintain ON/OFF control of the transistors of the stacks.
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Patent Agency Ranking
公开(公告)号：US20240396503A1
公开(公告)日：2024-11-28
申请号：US18790254
申请日：2024-07-31
Applicant: pSemi Corporation
Inventor： Miles SANNER , Emre AYRANCI , Parvez DARUWALLA
Abstract: Methods and circuital arrangements for turning OFF branches of a multi-branch cascode amplifier are presented. First and second switching arrangements coupled to a branch allow turning OFF the branch while protecting transistors of the branch from a supply voltage that may be greater than a tolerable voltage of the transistors. The first switching arrangement includes a transistor-based switch that is in series connection with the transistors of the branch. The first switching arrangement drops the supply voltage during the OFF state of the branch and provides a conduction path for a current through the branch during the ON state of the branch. A resistor and a shunting switch are coupled to a gate of the transistor-based switch to reduce parasitic coupling effects of the transistor-based switch upon an RF signal coupled to the branch during the ON state and OFF state of the branch.
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公开(公告)号：US20240243738A1
公开(公告)日：2024-07-18
申请号：US18507777
申请日：2023-11-13
Applicant: pSemi Corporation
Inventor： Parvez DARUWALLA , Khushali SHAH
CPC classification number: H03K5/08 , H03F3/19 , H03G11/02 , H03F2200/294 , H03F2200/451
Abstract: Programmable clamping methods and devices providing adjustable clamping powers to accommodate different applications and requirements are disclosed. The described devices can use switchable clamping circuits having different structures, body-controlled clamping circuits, or clamping circuits adjusting their input power levels using programmable resistive ladders. Examples of how the disclosed devices can be combined to improve design flexibility are also provided.
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公开(公告)号：US20240235596A9
公开(公告)日：2024-07-11
申请号：US18499138
申请日：2023-10-31
Applicant: pSemi Corporation
Inventor： Parvez DARUWALLA , Sung Kyu HAN
CPC classification number: H04B1/1615 , H03F3/195 , H03G3/3052 , H04B1/18 , H03F2200/294
Abstract: Methods and devices for limiting the power level of low noise amplifiers (LNA) implemented in radio frequency (RF) receiver front-ends. The described methods are applicable to bypass, low and high gain modes of the LNA. According to the described methods, the decoder allows the signal to be clamped before or after being attenuated. The benefit of such methods is to improve large signal performances (e.g. IIP3, P1dB) of the RF receiver front-end, while still meeting the clamping requirements, or improve (lower) clamped output power, while still meeting large signal performances (e.g. IIP3, P1dB).
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公开(公告)号：US20230387863A1
公开(公告)日：2023-11-30
申请号：US17804470
申请日：2022-05-27
Applicant: pSemi Corporation
Inventor： Parvez DARUWALLA , Rong JIANG , Khushali SHAH
CPC classification number: H03F1/223 , H03F3/195 , H03F3/72 , H03F2200/294 , H03F2200/451 , H03F2203/7212
Abstract: Feedback methods and devices to reduce gain in RF amplifiers, more in particular LNAs, are disclosed. The described methods are based on providing feedback paths from the drain terminal of one of the LNA cascode transistors to the source terminal of the LNA input transistor, or from the gate terminal of the input transistor to the source terminal of the LNA input transistor. The disclosed methods can be combined with one another or with existing feedback methods to provide further flexibility and improved tradeoffs when designing LNAs for applications having different requirements.
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公开(公告)号：US20250007502A1
公开(公告)日：2025-01-02
申请号：US18343316
申请日：2023-06-28
Applicant: pSemi Corporation
Inventor： Joseph Porter SLATON , Parvez DARUWALLA
IPC: H03K5/1252 , H02H9/04
Abstract: Ground impedance may have adverse effects on the performance of RF circuits that employ shunt switches. The disclosed methods and devices address this issue. The methods and devices involve the use of resonance-canceling inductors to counteract the capacitive reactance caused by parasitic capacitances and/or decoupling capacitors utilized in such systems. Solutions that incorporate series resistors to distribute the resonance across the frequency band of operation are also described. Additionally, devices that employ digitally tuned capacitors to shift the resonance frequency outside the operational band are presented.
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