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公开(公告)号：US20180131378A1
公开(公告)日：2018-05-10
申请号：US15346524
申请日：2016-11-08
发明人： Baher Haroun , Wenting Zhou , Kai Yiu Tam , Reza Hoshyar , Ali Kiaei
摘要： A high linearity phase interpolator (PI) is disclosed. A phase value parameter indicative of a desired phase difference between an output signal and an input clock signal edge may be provided by control logic. A first capacitor may be charged for a first period of time with a first current that is proportional to the phase value parameter to produce a first voltage on the capacitor that is proportional to the phase value parameter. The first capacitor may be further charged for a second period of time with a second current that has a constant value to form a voltage ramp offset by the first voltage. A reference voltage may be compared to the voltage ramp during the second period of time. The output signal may be asserted at a time when the voltage ramp equals the reference voltage.
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公开(公告)号：US10958213B2
公开(公告)日：2021-03-23
申请号：US16870582
申请日：2020-05-08
发明人： Ben-yong Zhang , Seong-Ryong Ryu , Ali Kiaei , Ting-Ta Yen , Kai Yiu Tam
摘要： A clock oscillator includes with a pullable BAW oscillator to generate an output signal with a target frequency. The BAW oscillator is based on a BAW resonator and voltage-controlled variable load capacitance, responsive to a capacitance control signal to provide a selectable load capacitance. An oscillator driver (such as a differential negative gm transconductance amplifier), is coupled to the BAW oscillator to provide an oscillation drive signal. The BAW oscillator is responsive to the oscillation drive signal to generate the output signal with a frequency based on the selectable load capacitance. The oscillator driver can include a bandpass filter network with a resonance frequency substantially at the target frequency.
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公开(公告)号：US10651789B2
公开(公告)日：2020-05-12
申请号：US15719540
申请日：2017-09-28
发明人： Ben-yong Zhang , Seong-Ryong Ryu , Ali Kiaei , Ting-Ta Yen , Kai Yiu Tam
摘要： A clock oscillator includes with a pullable BAW oscillator to generate an output signal with a target frequency. The BAW oscillator is based on a BAW resonator and voltage-controlled variable load capacitance, responsive to a capacitance control signal to provide a selectable load capacitance. An oscillator driver (such as a differential negative gm transconductance amplifier), is coupled to the BAW oscillator to provide an oscillation drive signal. The BAW oscillator is responsive to the oscillation drive signal to generate the output signal with a frequency based on the selectable load capacitance. The oscillator driver can include a bandpass filter network with a resonance frequency substantially at the target frequency.
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公开(公告)号：US10855294B2
公开(公告)日：2020-12-01
申请号：US15346524
申请日：2016-11-08
发明人： Baher Haroun , Wenting Zhou , Kai Yiu Tam , Reza Hoshyar , Ali Kiaei
摘要： A high linearity phase interpolator (PI) is disclosed. A phase value parameter indicative of a desired phase difference between an output signal and an input clock signal edge may be provided by control logic. A first capacitor may be charged for a first period of time with a first current that is proportional to the phase value parameter to produce a first voltage on the capacitor that is proportional to the phase value parameter. The first capacitor may be further charged for a second period of time with a second current that has a constant value to form a voltage ramp offset by the first voltage. A reference voltage may be compared to the voltage ramp during the second period of time. The output signal may be asserted at a time when the voltage ramp equals the reference voltage.
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公开(公告)号：US20200274485A1
公开(公告)日：2020-08-27
申请号：US16870582
申请日：2020-05-08
发明人： Ben-yong Zhang , Seong-Ryong Ryu , Ali Kiaei , Ting-Ta Yen , Kai Yiu Tam
摘要： A clock oscillator includes with a pullable BAW oscillator to generate an output signal with a target frequency. The BAW oscillator is based on a BAW resonator and voltage-controlled variable load capacitance, responsive to a capacitance control signal to provide a selectable load capacitance. An oscillator driver (such as a differential negative gm transconductance amplifier), is coupled to the BAW oscillator to provide an oscillation drive signal. The BAW oscillator is responsive to the oscillation drive signal to generate the output signal with a frequency based on the selectable load capacitance. The oscillator driver can include a bandpass filter network with a resonance frequency substantially at the target frequency.
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公开(公告)号：US20170149386A1
公开(公告)日：2017-05-25
申请号：US14947424
申请日：2015-11-20
发明人： Baher S. Haroun , Ali Kiaei , Kai Yiu Tam
CPC分类号： H03B5/364 , H03B5/326 , H03K3/0231 , H03L1/02 , H03L7/085 , H03L7/099 , H03L2207/50
摘要： The systems and methods of oscillator frequency tuning using a bulk acoustic wave resonator include a relaxation oscillator, a BAW oscillator, a frequency counter, and an adjustment module. The BAW oscillator provides an accurate time reference even over temperature changes. The BAW oscillator is turned on periodically and the relaxation oscillator is calibrated with the BAW oscillator. A temporary and periodic enablement of the BAW oscillator maintains a low current consumption. The frequency counter counts a number of full periods of the BAW oscillator that occur in one period of the relaxation oscillator. Since each frequency is known, the number of pulses of the BAW oscillator that should occur during one period of the relaxation oscillator is known. If the count is different from what should be counted, a correction may be made by adjusting an input parameter of the relaxation oscillator.
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公开(公告)号：US20160013753A1
公开(公告)日：2016-01-14
申请号：US14329939
申请日：2014-07-12
发明人： Kai Yiu Tam , Ali Kiaei , Baher S. Haroun
摘要： A relaxation oscillator reduces temperature sensitivity and phase noise at low offset frequency by periodically swapping a first current and a second current so that after the first current has been input to a first pair of circuits and the second current has been input to a second pair of circuits, the second current is input to the first pair of circuits and the first current is input to the second pair of circuits.
摘要翻译： 松弛振荡器通过周期性交换第一电流和第二电流来降低在低偏移频率下的温度灵敏度和相位噪声，使得在第一电流已经被输入到第一对电路之后，并且第二电流已经被输入到第二对 电路，第二电流被输入到第一对电路，第一电流被输入到第二对电路。
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公开(公告)号：US20210044300A1
公开(公告)日：2021-02-11
申请号：US17080879
申请日：2020-10-27
发明人： Baher Haroun , Wenting Zhou , Kai Yiu Tam , Reza Hoshyar , Ali Kiaei
摘要： A high linearity phase interpolator (PI) is disclosed. A phase value parameter indicative of a desired phase difference between an output signal and an input clock signal edge may be provided by control logic. A first capacitor may be charged for a first period of time with a first current that is proportional to the phase value parameter to produce a first voltage on the capacitor that is proportional to the phase value parameter. The first capacitor may be further charged for a second period of time with a second current that has a constant value to form a voltage ramp offset by the first voltage. A reference voltage may be compared to the voltage ramp during the second period of time. The output signal may be asserted at a time when the voltage ramp equals the reference voltage.
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公开(公告)号：US20180091095A1
公开(公告)日：2018-03-29
申请号：US15719540
申请日：2017-09-28
发明人： Ben-yong Zhang , Seong-Ryong Ryu , Ali Kiaei , Ting-Ta Yen , Kai Yiu Tam
CPC分类号： H03B1/04 , H03B1/02 , H03B5/326 , H03B5/368 , H03B2200/004 , H03B2200/009 , H03L7/0891 , H03L7/093 , H03L7/099
摘要： A clock oscillator includes with a pullable BAW oscillator to generate an output signal with a target frequency. The BAW oscillator is based on a BAW resonator and voltage-controlled variable load capacitance, responsive to a capacitance control signal to provide a selectable load capacitance. An oscillator driver (such as a differential negative gm transconductance amplifier), is coupled to the BAW oscillator to provide an oscillation drive signal. The BAW oscillator is responsive to the oscillation drive signal to generate the output signal with a frequency based on the selectable load capacitance. The oscillator driver can include a bandpass filter network with a resonance frequency substantially at the target frequency.
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公开(公告)号：US09692356B2
公开(公告)日：2017-06-27
申请号：US14947424
申请日：2015-11-20
发明人： Baher S. Haroun , Ali Kiaei , Kai Yiu Tam
CPC分类号： H03B5/364 , H03B5/326 , H03K3/0231 , H03L1/02 , H03L7/085 , H03L7/099 , H03L2207/50
摘要： The systems and methods of oscillator frequency tuning using a bulk acoustic wave resonator include a relaxation oscillator, a BAW oscillator, a frequency counter, and an adjustment module. The BAW oscillator provides an accurate time reference even over temperature changes. The BAW oscillator is turned on periodically and the relaxation oscillator is calibrated with the BAW oscillator. A temporary and periodic enablement of the BAW oscillator maintains a low current consumption. The frequency counter counts a number of full periods of the BAW oscillator that occur in one period of the relaxation oscillator. Since each frequency is known, the number of pulses of the BAW oscillator that should occur during one period of the relaxation oscillator is known. If the count is different from what should be counted, a correction may be made by adjusting an input parameter of the relaxation oscillator.
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