公开(公告)号：US11614763B1

公开(公告)日：2023-03-28

申请号：US17568614

申请日：2022-01-04

Applicant: QUALCOMM Incorporated

Inventor： Debesh Bhatta ,  Sulin Li ,  Shitong Zhao ,  Hui Wang ,  John Abcarius

IPC: G05F3/26 ,  G05F1/46

Abstract: An aspect of the disclosure relates to a reference voltage generator, including: a first field effect transistor (FET) including a first threshold voltage; a second FET including a second threshold voltage different than the first threshold voltage; a gate voltage generator coupled to gates of the first and second FETs; a first current source coupled in series with the first FET between first and second voltage rails; a second current source; and a first resistor coupled in series with the second current source and the second FET between the first and second voltage rails, wherein a reference voltage is generated across the first resistor.

公开(公告)号：US11705897B2

公开(公告)日：2023-07-18

申请号：US17495608

申请日：2021-10-06

Applicant: QUALCOMM Incorporated

Inventor： Xu Zhang ,  Xuhao Huang ,  Shitong Zhao

IPC: H03K5/14 ,  H03K3/03 ,  G05F1/56 ,  H03F3/45 ,  H04B1/40

CPC classification number: H03K5/14 ,  G05F1/56 ,  H03F3/45475 ,  H03K3/0315 ,  H04B1/40

Abstract: An aspect relates to an apparatus, including: a ring oscillator coupled between a first node and a first voltage rail; a control circuit coupled to the first node; a delay line coupled between a second node and the first voltage rail; and a voltage regulator including an input coupled to the first node and an output coupled to the second node.

公开(公告)号：US11115036B1

公开(公告)日：2021-09-07

申请号：US16991882

申请日：2020-08-12

Applicant: QUALCOMM Incorporated

Inventor： Shitong Zhao ,  Kevin Jia-Nong Wang ,  Shyam Sivakumar ,  Debesh Bhatta

IPC: H03L7/093 ,  H03L7/099 ,  H03L7/24 ,  H03L7/14

Abstract: An oscillator including a switched capacitor configured to generate a sawtooth or ramp voltage in response to a switched capacitor drive signal; a low pass filter (LPF) configured to filter the sawtooth or ramp voltage to generate a filtered voltage; a reference voltage generator configured to generate a reference voltage; an integrator configured to integrate a difference between the sawtooth or ramp voltage and the reference voltage to generate a frequency control signal; a voltage controlled oscillator (VCO) configured to generate a first clock based on the frequency control signal; a frequency divider configured to frequency divide the first clock to generate a second clock; and a switched capacitor driver configured to generate the switched capacitor drive signal in response to the second clock. The oscillator may also include a switched capacitor sampler to sample the sawtooth or ramp voltage, wherein the filtered voltage is based on the sampled voltage.

公开(公告)号：US20200156108A1

公开(公告)日：2020-05-21

申请号：US16194181

申请日：2018-11-16

Applicant: QUALCOMM Incorporated

Inventor： Shitong Zhao ,  Masoud Roham ,  Lennart Mathe ,  Bo-Ren Wang

IPC: B06B1/02 ,  B06B1/06 ,  G01S15/89 ,  G01S7/52

Abstract: A voltage burst is generated using a voltage supply having a single DC output voltage, VH coupled with a switching arrangement, including an input and a voltage transmitter output (Tx_Out), the input coupled with the output of the voltage supply. A control arrangement coupled with the switching arrangement is configured to operate the switching arrangement so as to provide, at the Tx_Out, a voltage burst that varies between an intermediate voltage, VM, and one or both of VH, and a minimum voltage, VL, where VL