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公开(公告)号：US11201605B2
公开(公告)日：2021-12-14
申请号：US17247577
申请日：2020-12-17
申请人： NXP USA, Inc.
发明人： Jianzhou Wu , Jiawei Fu , Yang Wang , Bin Zhang
IPC分类号： H03K3/00 , H03K3/017 , H03K3/354 , H03K19/003 , H03K3/012 , H03K17/687 , H03K19/20
摘要： A buffer stage for amplifying a clock signal generated by a current controlled oscillator that receives a first current at a first supply voltage from a first current source. The buffer stage comprises an input terminal configured to receive the clock signal; an output terminal configured to output a buffered signal; at least one buffer, coupled between the input and output terminal, configured to receive a second current at a second supply voltage and buffer the clock signal to generate the buffered signal; a clamping circuit that receives the first current and the second current, and generates a first supply voltage and a second supply voltage. The clamping circuit clamps the second supply voltage equal to the first supply voltage.
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公开(公告)号：US20190222201A1
公开(公告)日：2019-07-18
申请号：US16237727
申请日：2019-01-01
申请人： NXP USA, INC.
发明人： Yang Wang , Jianzhou Wu , Jie Jin , Jiawei Fu
IPC分类号： H03K3/0231 , H03L3/00 , H03L7/099
CPC分类号： H03K3/0231 , G05F3/262 , H03L3/00 , H03L7/0995
摘要： A start-up circuit for a ring current-controlled oscillator (CCO) includes a replica CCO current generator, a replica ring CCO, and a buffer. The ring CCO is connected to a CCO driver and the buffer. The CCO driver generates a CCO current based on a reference current. The ring CCO generates a CCO output voltage at a first oscillating frequency based on the CCO current. The replica CCO current generator generates a replica CCO current based on a reference voltage. The replica ring CCO generates a replica CCO output voltage at a second oscillating frequency based on the replica CCO current. The buffer provides a first current to the ring CCO when the first oscillating frequency is lower than a desired oscillating frequency, and drains a second current from the ring CCO when the first oscillating frequency is greater than the desired oscillating frequency.
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公开(公告)号：US10027312B2
公开(公告)日：2018-07-17
申请号：US15366845
申请日：2016-12-01
申请人： NXP USA, INC.
发明人： Yang Wang , Jianzhou Wu , Yizhong Zhang , Hao Zhi , Bin Zhang , Zhengxiang Wang , Yan Huang
摘要： A relaxation oscillator for generating a low temperature coefficient (LTC) clock signal includes a reference voltage generator and an oscillator. The reference voltage generator generates an LTC current and a bandgap reference voltage. The reference voltage generator includes positive temperature coefficient (PTC) resistors to compensate for the effects of temperature variations. The oscillator receives the LTC current and the bandgap reference voltage, and generates a clock signal. In another embodiment, the reference voltage generator generates a charge current that varies with temperature. The oscillator receives the charge current and generates first and second output signals. Set and reset comparators include PTC resistors that determine the gains of the set and reset comparators. The PTC resistors compensate for variation in the first and second output signals due to the temperature variations by varying the gains of the set and reset comparators.
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公开(公告)号：US20210194467A1
公开(公告)日：2021-06-24
申请号：US17247577
申请日：2020-12-17
申请人： NXP USA, Inc.
发明人： Jianzhou Wu , Jiawei Fu , Yang Wang , Bin Zhang
IPC分类号： H03K3/012 , H03K19/20 , H03K17/687
摘要： A buffer stage for amplifying a clock signal generated by a current controlled oscillator that receives a first current at a first supply voltage from a first current source. The buffer stage comprises an input terminal configured to receive the clock signal; an output terminal configured to output a buffered signal; at least one buffer, coupled between the input and output terminal, configured to receive a second current at a second supply voltage and buffer the clock signal to generate the buffered signal; a clamping circuit that receives the first current and the second current, and generates a first supply voltage and a second supply voltage. The clamping circuit clamps the second supply voltage equal to the first supply voltage.
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公开(公告)号：US10659013B2
公开(公告)日：2020-05-19
申请号：US16237727
申请日：2019-01-01
申请人： NXP USA, INC.
发明人： Yang Wang , Jianzhou Wu , Jie Jin , Jiawei Fu
摘要： A start-up circuit for a ring current-controlled oscillator (CCO) includes a replica CCO current generator, a replica ring CCO, and a buffer. The ring CCO is connected to a CCO driver and the buffer. The CCO driver generates a CCO current based on a reference current. The ring CCO generates a CCO output voltage at a first oscillating frequency based on the CCO current. The replica CCO current generator generates a replica CCO current based on a reference voltage. The replica ring CCO generates a replica CCO output voltage at a second oscillating frequency based on the replica CCO current. The buffer provides a first current to the ring CCO when the first oscillating frequency is lower than a desired oscillating frequency, and drains a second current from the ring CCO when the first oscillating frequency is greater than the desired oscillating frequency.
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