公开(公告)号：US20190215000A1

公开(公告)日：2019-07-11

申请号：US15868551

申请日：2018-01-11

Applicant: QUALCOMM Incorporated

Inventor： Yuehai JIN ,  Xinhua CHEN

IPC: H03L7/099 ,  H03K3/03 ,  H03L7/089

CPC classification number: H03L7/0995 ,  H03K3/0315 ,  H03L7/0891

Abstract: Certain aspects of the present disclosure provide methods and apparatus for generating an oscillating signal using a ring oscillator circuit. One example ring oscillator circuit generally includes one or more delay elements coupled in series, wherein an output of a last one of the delay elements is coupled to an input of an initial one of the delay elements, and a plurality of resistive elements selectively coupled to a tail node of at least a first one of the delay elements, the resistive elements being configured to coarse-tune a frequency of an oscillating signal generated by the ring oscillator circuit. For certain aspects, the ring oscillator circuit further includes a plurality of tunable capacitive elements coupled to an output node of at least a second one of the delay elements, the tunable capacitive elements being configured to fine-tune the frequency of the oscillating signal.

公开(公告)号：US20190296750A1

公开(公告)日：2019-09-26

申请号：US15933204

申请日：2018-03-22

Applicant: QUALCOMM Incorporated

Inventor： Yuehai JIN ,  Xinhua CHEN

IPC: H03L7/099 ,  H03L7/093 ,  H03M3/02 ,  H03K5/00 ,  H03K5/24 ,  H03M1/66

Abstract: A coarse tuning synthesizer for wireless communication includes a digital control unit, a digital-to-analog converter, and a comparator. The digital control unit includes an output node coupled to a first input node of a VCO (voltage controlled oscillator). The digital-to-analog converter includes a first node coupled to the first input node of the VCO. The comparator includes an output node coupled to an input node of the digital control unit. The comparator also includes a first input node coupled to a second node of the digital-to-analog converter and a second input node coupled to an output node of the VCO.

公开(公告)号：US20150349712A1

公开(公告)日：2015-12-03

申请号：US14489444

申请日：2014-09-17

Applicant: QUALCOMM Incorporated

Inventor： Tsai-Pi HUNG ,  Gang ZHANG ,  Jae-Hong CHANG ,  Yung-Chung LO ,  Jianjun YU ,  Yuehai JIN

IPC: H03B5/12

CPC classification number: H03B5/1265 ,  H03B5/1212 ,  H03B5/1243

Abstract: Aspects of a reconfigurable varactor array for providing a capacitance to control an output frequency of a voltage-controlled oscillator are provided. The reconfigurable varactor array can be configured to provide a configurable capacitance. The reconfigurable varactor array can include a plurality of varactor cells connected in parallel. The reconfigurable varactor array can also include a control circuit configured to receive a control signal to select the configurable capacitance from the reconfigurable varactor array. The control circuit can include a plurality of switch groups. Each switch group can be separately connected to one varactor cell in the reconfigurable varactor array. The control signal from the control circuit can control operation of each switch group.

Abstract translation: 提供了用于提供电容以控制压控振荡器的输出频率的可重构变容二极管阵列的方面。 可配置变容二极管阵列可以配置为提供可配置的电容。 可重构变容二极管阵列可以包括并联连接的多个变容二极管单元。 可重构变容二极管阵列还可以包括控制电路，其被配置为接收控制信号以从可重构变容二极管阵列中选择可配置电容。 控制电路可以包括多个开关组。 每个开关组可以单独连接到可重新配置的变容二极管阵列中的一个变容二极管单元。 来自控制电路的控制信号可以控制每个开关组的操作。