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公开(公告)号：US11644854B2
公开(公告)日：2023-05-09
申请号：US17106587
申请日：2020-11-30
发明人： Jianxing Chen
摘要： Provided are an LDO, an MCU, a fingerprint module and a terminal device. The LDO includes: a reference voltage generating circuit and a source follower connected to the reference voltage generating circuit. The reference voltage generating circuit is used to generate a reference voltage that changes with temperature to offset a voltage change caused by a voltage between a first terminal and a second terminal of the source follower changing with time, so that an output voltage of the second terminal of the source follower does not change with temperature. The LDO omits an operational amplifier EA and a resistor divider feedback network in the prior art, which not only has a simple circuit structure, but also can achieve ultra-low power consumption.
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公开(公告)号：US11526185B2
公开(公告)日：2022-12-13
申请号：US17066231
申请日：2020-10-08
摘要： A solid-state circuit is presented which may comprise a pass device, a control circuit, and a leakage current compensation circuit. The pass device may have a first terminal, a second terminal and a drive terminal, wherein the first terminal of the pass device is coupled with an input terminal of the solid-state circuit, and wherein the second terminal of the pass device is coupled with an output terminal of the solid-state circuit. The control circuit may be coupled with the drive terminal of the pass device and may be configured to drive the pass device with a driving voltage. The leakage current compensation circuit may be configured to receive a leakage current of the pass device and may be configured to forward said leakage current as a bias current to said control circuit.
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公开(公告)号：US20220302906A1
公开(公告)日：2022-09-22
申请号：US17838029
申请日：2022-06-10
摘要： Trimming components within an oscillator comprising: a trim-capable current source, wherein the trim-capable current source comprises a trimmable resistor and a trimmable current component, a comparator comprising a first input terminal that couples to the trim-capable current source and the second input terminal that couples to a reference voltage source, a switch coupled to the first input terminal and the trim-capable current source, and a trim-capable capacitor coupled to the switch, wherein the switch is coupled between the trim-capable capacitor and the trim-capable current source.
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公开(公告)号：US20220147083A1
公开(公告)日：2022-05-12
申请号：US17406148
申请日：2021-08-19
发明人： Shao-Chueh HU
摘要： A voltage regulation circuit includes a node, a voltage regulator, a plurality of load units and a voltage feedback circuit. The node has a node voltage. The voltage regulator is electrically connected to the node. The load units are electrically connected to the voltage regulator via the node. The load units are driven by the node voltage and have at least one load state. The voltage feedback circuit is electrically connected between the voltage regulator and the node. The voltage feedback circuit includes a switch and receives the node voltage and a control signal. The control signal includes the at least one load state. The voltage feedback circuit controls the switch according to the at least one load state of the control signal to output a feedback voltage. The voltage regulator adjusts the node voltage according to the feedback voltage.
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公开(公告)号：US20210311514A1
公开(公告)日：2021-10-07
申请号：US16966476
申请日：2020-04-30
申请人： SOUTHEAST UNIVERSITY
发明人： Chao CHEN , Jun YANG , Xinning LIU
摘要： A low-temperature drift ultra-low-power linear regulator includes eight PMOS transistors, two resistors, two capacitors and three NMOS transistors. The eight PMOS transistors include PMOS transistor PM1 to PMOS transistor PM8. The two resistors include resistor R1 and resistor R2. The two capacitors include capacitor C1 and capacitor C2. The three NMOS transistors include NMOS transistor NM1, NMOS transistor NM2 and NMOS transistor NM3. From right to left, the linear regulator includes a PTAT voltage core starting circuit, a PTAT voltage core circuit, a negative temperature characteristic generating circuit and a driver stage closed-loop control circuit. PM5-PM8 form a feedback circuit. The feedback circuit clamps the current flowing through PM6 to be proportional to PM2 to obtain a temperature-stable output voltage, and can dynamically adjust the gate voltage of PM5 according to the change of load current to output different currents according to the load demand.
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16.发明申请公开(公告)号：US20200333821A1
公开(公告)日：2020-10-22
申请号：US16922161
申请日：2020-07-07
申请人： DENSO CORPORATION
发明人： Yukihiro TOMONAGA , Kazutaka HONDA
摘要： A correction current output circuit comprises a first voltage dividing circuit for generating a voltage in which an output voltage from a bandgap reference voltage circuit is divided in multiple stages, first and second correction circuits connected between a power supply and a ground, and a second voltage dividing circuit for dividing the above voltage in multiple stages in a path in which a positive temperature characteristic voltage is generated with the band gap reference voltage circuit. Current output terminals of a the second transistor of the first correction circuit and a first transistor of the second correction circuit are connected to a common connection point, and a current for correcting the temperature characteristic of a reference voltage generation circuit is output from the common connection point.
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公开(公告)号：US10673415B2
公开(公告)日：2020-06-02
申请号：US16048860
申请日：2018-07-30
发明人： Gaurav Gupta , Arthur J. Kalb
IPC分类号： A61B5/00 , H03K3/011 , H03K17/60 , A61B5/0428 , G05F1/567
摘要： Techniques to generate two separate temperature independent reference voltages. The reference voltages can be generated using a chain of ΔVBE cells. A cross-quad ΔVBE-cell-based bandgap voltage reference can cancel out noise of associated current sources by forcing them to correlate. Several ΔVBE stages can be cascaded together to generate an appreciable PTAT component that can cancel the CTAT component from VBE. In some example configurations, only BJTs are used—without requiring use of an amplifier—to generate the bandgap voltages; in this way, extremely low noise voltage references can be generated. The PTAT and the CTAT voltages can be combined to generate a bandgap voltage of approximately VG0 or approximately 2VG0.
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公开(公告)号：US20200097032A1
公开(公告)日：2020-03-26
申请号：US16547272
申请日：2019-08-21
发明人： Daisuke KATAGIRI
IPC分类号： G05F1/46 , G05F1/567 , H03K17/042
摘要： Methods of controlling semiconductor device and semiconductor device are provided in which a semiconductor device can define a normally operational ambient temperature at a low level. The Microcontroller includes a logical block, a temperature sensor for measuring junction temperature, a power consumption circuit for consuming predetermined power, and a Controller for controlling the consumption of power by the power consumption circuit such that the temperature measured at the temperature sensor is not less than a predetermined operational lower limit temperature of the logical block 110.
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公开(公告)号：US20200036366A1
公开(公告)日：2020-01-30
申请号：US16048860
申请日：2018-07-30
发明人： Gaurav Gupta , Arthur J. Kalb
IPC分类号： H03K3/011 , H03K17/60 , G05F1/567 , A61B5/0428 , A61B5/00
摘要： Techniques to generate two separate temperature independent reference voltages. The reference voltages can be generated using a chain of ΔVBE cells. A cross-quad ΔVBE-cell-based bandgap voltage reference can cancel out noise of associated current sources by forcing them to correlate. Several ΔVBE stages can be cascaded together to generate an appreciable PTAT component that can cancel the CTAT component from VBE. In some example configurations, only BJTs are used—without requiring use of an amplifier—to generate the bandgap voltages; in this way, extremely low noise voltage references can be generated. The PTAT and the CTAT voltages can be combined to generate a bandgap voltage of approximately VG0 or approximately 2VG0.
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公开(公告)号：US10534388B1
公开(公告)日：2020-01-14
申请号：US16361545
申请日：2019-03-22
发明人： Santo Ilardo
摘要： A driver circuit includes a temperature sensor generating a first voltage representative of current operating temperature. An amplifier compares the first voltage to a second voltage representative of an upper threshold operating temperature, and generates a control signal based thereupon. A variable current source generates a load current from the control signal. The amplifier generates the control signal to cause the variable current source to generate the load current as having a magnitude equal to an upper threshold when the first voltage is less than the second voltage. The amplifier generates the control signal to cause the variable current source to generate the load current as having a magnitude that is decreasing until the first and second voltages are equal, and then generates the control signal to cause the variable current source to maintain the load current magnitude at a level at which the first and second voltages are equal.
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