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公开(公告)号：US10911078B1
公开(公告)日：2021-02-02
申请号：US16791546
申请日：2020-02-14
Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
Inventor： David D. Wentzloff , Yao Shi , David T. Blaauw
Abstract: A millimeter-scale Bluetooth low energy wireless transmitter is presented with a dual purpose loop antenna. The oscillator employs a high quality factor resonator formed by a printed 3.5×3.5 mm2 inductive loop antenna (simulated Q˜110) and an on-chip digitally-switched capacitor array (simulated Q˜283). The oscillator replaces the traditional voltage controlled oscillator plus power amplifier, achieving lower power consumption while maintaining phase noise of −118.5 dBc/Hz at 1 MHz offset that results in low FSK modulation error (2.1%) and low frequency drift during BLE packet transmission.
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公开(公告)号：US10732293B2
公开(公告)日：2020-08-04
申请号：US15840197
申请日：2017-12-13
Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
Inventor： David D. Wentzloff , Hyeongseok Kim
Abstract: A quadrature fully integrated tri-band GPS receiver implemented in 65 nm CMOS. The analog front-end (AFE) is specifically designed for a miniaturized low-power GPS logger that leverages heavy duty-cycling. The main contribution of the RF front-end is comprised of two main signal paths which support the single-band only mode and the tri-band mode (L1, L2, L5). In the tri-band mode, the AFE is able to fold three GPS signals into a single low intermediate frequency channel in part due to the orthogonality of the pseudo-ransom codes. In active mode, the radio draws 12.1 mW in the single-band (L1) mode with a LNA and an active mixer, and 8.2 mW in the tri-band mode with a passive front-end, from a 1.2 V supply, and with a startup time of 20 us.
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公开(公告)号：US10567154B1
公开(公告)日：2020-02-18
申请号：US16197943
申请日：2018-11-21
Applicant: The Regents of The University of Michigan
Inventor： David D. Wentzloff , Xing Chen
IPC: H04L7/00 , H04L7/033 , H03K3/03 , G04F10/00 , H03K5/00 , H03F3/19 , H03F3/24 , H04B1/04 , H03L7/099
Abstract: A Bluetooth Low-Energy (BLE) transmitter is presented for used in ultra-low-power radios in short range IoT applications. The power consumption of state-of-the-art BLE transmitter has been limited by the relatively power-hungry local oscillator due to the use of LC oscillators for superior phase noise performance. This disclosure addresses this issue by analyzing the phase noise limit of a BLE TX and proposes a ring oscillator-based solution for power and cost savings. The proposed transmitter features: 1) a wideband all-digital phase locked loop (ADPLL) featuring an fRF/4 RO, with an embedded 5-bit TDC; 2) a 4× frequency edge combiner to generate the 2.4 GHz signal; and 3) a switch-capacitor digital PA optimized for high efficiency at low transmit power levels. These not only help reduce the power consumption and improve phase noise performance, but also enhance the transmitter efficiency for short range applications.
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公开(公告)号：US09641183B2
公开(公告)日：2017-05-02
申请号：US15031115
申请日：2014-10-22
Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
Inventor： David D. Wentzloff , Muhammad Faisal
CPC classification number: H03L7/087 , H03B5/32 , H03B5/364 , H03L7/0991 , H03L7/0995 , H03L7/113 , H03L7/235 , H03L2207/50
Abstract: A programmable clock generator is provided which is particularly suitable for low power applications. The programmable clock generator is comprised of: an oscillator circuit that generates an output signal whose frequency is set by a control signal, two feedback loops for controlling output frequency and a loop select that selects which feedback loop is operational at a given time. In operation, the frequency loop operates to coarsely adjust the frequency of the output signal; whereas, the phase loop operates to finely adjust the frequency of the output signal. The clock generator is preferably implemented by transistors operating in or near the subthreshold region.
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公开(公告)号：US10340972B2
公开(公告)日：2019-07-02
申请号：US15670386
申请日：2017-08-07
Inventor： Benton H. Calhoun , Yousef Shakhsheer , Yanqing Zhang , Alicia Klinefelter , David D. Wentzloff , Nathan E. Roberts , Seunghyun Oh
Abstract: An apparatus comprises a system on a chip (SoC). In some embodiments, the SoC includes a power supply circuit, a power management circuit operatively coupled to the power supply circuit, a first wireless communications circuit and a second wireless communications circuit. The first wireless communications circuit is configured to receive an RF signal and is operatively coupled to the power supply circuit and the power management circuit. The first wireless communications circuit has a net radio frequency (RF) power gain no more than unity before at least one of downconversion of the RF signal or detection of the RF signal. The second wireless communications circuit is operatively coupled to the power supply circuit and the power management circuit.
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Patent Agency Ranking
公开(公告)号：US10200232B1
公开(公告)日：2019-02-05
申请号：US15800634
申请日：2017-11-01
Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
Inventor： David D. Wentzloff , Hun-Seok Kim , Avish Kosari
Abstract: A digital quadrature architecture is presented that employs switched current digital power amplifiers and uses a digital class-B input code profile in combination with non-overlapping LO signals to overcome the low efficiency problems of conventional quadrature architectures. By employing digital class-B signals, the number of I/Q cells is reduced to half and the need for extra processing of the sign bits is eliminated in the transmitters, thereby improving the efficiency.
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公开(公告)号：US20180097538A1
公开(公告)日：2018-04-05
申请号：US15670386
申请日：2017-08-07
Applicant: UNIVERSITY OF VIRGINIA PATENT FOUNDATION D/B/A UNIVERSITY OF VIRGINIA LICENSING & VENTURES GROUP , THE REGENTS OF THE UNIVERSITY OF MICHIGAN
Inventor： Benton H. Calhoun , Yousef Shakhsheer , Yanqing Zhang , Alicia Klinefelter , David D. Wentzloff , Nathan E. Roberts , Seunghyun Oh
CPC classification number: H04B1/406 , H04B1/1607 , H04W4/70 , Y02D70/00 , Y02D70/40
Abstract: An apparatus comprises a system on a chip (SoC). In some embodiments, the SoC includes a power supply circuit, a power management circuit operatively coupled to the power supply circuit, a first wireless communications circuit and a second wireless communications circuit. The first wireless communications circuit is configured to receive an RF signal and is operatively coupled to the power supply circuit and the power management circuit. The first wireless communications circuit has a net radio frequency (RF) power gain no more than unity before at least one of downconversion of the RF signal or detection of the RF signal. The second wireless communications circuit is operatively coupled to the power supply circuit and the power management circuit.
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公开(公告)号：US20150087255A1
公开(公告)日：2015-03-26
申请号：US14490786
申请日：2014-09-19
Applicant: The Regents of The University of Michigan
Inventor： David D. Wentzloff , Seunghyun Oh , Nathan E. Roberts
CPC classification number: H04B1/123 , H04B1/1027 , H04B2001/1072 , H04W52/0229 , H04W52/0235 , Y02D70/144
Abstract: A low power radio is provided with automatic interference rejection. The radio is comprised generally of: an antenna, a rectifier, a comparator, and a correlator. The comparator receives an input signal from the rectifier, compares the input signal to a reference signal and outputs a digital signal. The correlator in turn receives the digital signal from the comparator, correlates the digital signal to a wake-up code and outputs a wake-up signal having a high value when the digital signal is highly correlated with the wake-up code. The radio further includes an automatic threshold controller which adjusts sensitivity of the comparator. Of note, the rectifier, the comparator, the correlator and the automatic threshold controller are comprised in part by circuits having transistors operating only in subthreshold region.
Abstract translation: 低功率无线电设备具有自动干扰抑制功能。 无线电通常包括：天线，整流器，比较器和相关器。 比较器从整流器接收输入信号，将输入信号与参考信号进行比较，并输出数字信号。 相关器又从比较器接收数字信号，将数字信号与唤醒码相关，并且当数字信号与唤醒码高度相关时，输出具有高值的唤醒信号。 无线电还包括调整比较器的灵敏度的自动阈值控制器。 值得注意的是，整流器，比较器，相关器和自动阈值控制器部分地由仅具有在亚阈值区域中工作的晶体管的电路组成。
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公开(公告)号：US20130331051A1
公开(公告)日：2013-12-12
申请号：US13915749
申请日：2013-06-12
Applicant: The Regents of the University of Michigan
Inventor： David D. Wentzloff , Nathan E. Roberts
IPC: H04B1/16
CPC classification number: H04B1/1615 , H03K19/0016 , H03K19/0027 , H04W52/0225 , Y02D70/144 , Y02D70/162
Abstract: A wake-up function is provided for a low power radio. The radio includes: an antenna, a rectifier, and a comparator. The rectifier is configured to receive an RF signal from the antenna and generates an output having a magnitude that decreases in the presence of the RF signal. The comparator compares the output from the rectifier to a reference signal and outputs an activation signal for another radio component. In response the activation signal, the radio component will transition from a low power consumption mode to a higher power consumption mode. In this way, the rectifier and comparator cooperatively operate to perform a wake-up function in the presence of an RF signal.
Abstract translation: 为低功率无线电提供唤醒功能。 收音机包括：天线，整流器和比较器。 整流器被配置为从天线接收RF信号，并产生具有在存在RF信号时减小的幅度的输出。 比较器将整流器的输出与参考信号进行比较，并输出另一个无线电组件的激活信号。 响应于激活信号，无线电部件将从低功耗模式转换到较高功耗模式。 以这种方式，整流器和比较器协作地操作以在存在RF信号的情况下执行唤醒功能。
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公开(公告)号：US09681389B2
公开(公告)日：2017-06-13
申请号：US14768143
申请日：2014-02-17
Applicant: The Regents of The University of Michigan
Inventor： David D. Wentzloff , Jonathan K. Brown , Kuo-Ken Huang , Elnaz Ansari , Ryan R. Rogel
IPC: H04W52/02 , H04B1/7163 , H03K3/0231 , H03K5/24 , H04B1/40 , H04B1/7183
CPC classification number: H04W52/029 , H03K3/0231 , H03K5/24 , H04B1/40 , H04B1/71635 , H04B1/71637 , H04B1/7183 , Y02D70/00 , Y02D70/40
Abstract: An integrated ultra wideband transceiver. The transceiver comprises a transmitter, a receiver, and at least one on-chip monopole antenna electrically connected to at least one of the transmitter or receiver for transmitting and/or receiving electrical signals. The transceiver further comprises a clock generator comprising a temperature-compensated relaxation oscillator, a baseband controller electrically connected to, and configured to exert a measure of control over, at least one the transmitter, receiver, or clock generator, and a micro-battery operative to provide operating power to each of the transmitter, receiver, clock generator, and baseband controller.
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