公开(公告)号：US11496094B1

公开(公告)日：2022-11-08

申请号：US17239862

申请日：2021-04-26

Applicant: International Business Machines Corporation

Inventor： James Strom ,  Herschel Akiba Ainspan ,  Andrew D. Davies ,  John Borkenhagen

IPC: H03B5/12

Abstract: A voltage-controlled oscillator comprises a varactor. A capacitance of the first varactor is dependent upon a control voltage. The voltage-controlled also comprises an inductor. The inductor is connected to a center-tap connection. The voltage-controlled oscillator also comprises a power source. The power source is configured to provide a bias voltage to the inductor through the center-tap connection. The voltage-controlled oscillator also comprises a coupling capacitor. The coupling capacitor is located between the inductor and the varactor. The voltage-controlled oscillator also comprises a coupling resistor. The coupling resistor is located between the coupling capacitor and the center-tap connection. The center-tap connection provides the bias voltage to the coupling capacitor through the coupling resistor.

公开(公告)号：US20220345085A1

公开(公告)日：2022-10-27

申请号：US17239862

申请日：2021-04-26

Applicant: International Business Machines Corporation

Inventor： James Strom ,  Herschel Akiba Ainspan ,  Andrew D. Davies ,  John Borkenhagen

IPC: H03B5/12

Abstract: A voltage-controlled oscillator comprises a varactor. A capacitance of the first varactor is dependent upon a control voltage. The voltage-controlled also comprises an inductor. The inductor is connected to a center-tap connection. The voltage-controlled oscillator also comprises a power source. The power source is configured to provide a bias voltage to the inductor through the center-tap connection. The voltage-controlled oscillator also comprises a coupling capacitor. The coupling capacitor is located between the inductor and the varactor. The voltage-controlled oscillator also comprises a coupling resistor. The coupling resistor is located between the coupling capacitor and the center-tap connection. The center-tap connection provides the bias voltage to the coupling capacitor through the coupling resistor.

公开(公告)号：US20240348257A1

公开(公告)日：2024-10-17

申请号：US18301200

申请日：2023-04-14

Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION

Inventor： Bodhisatwa Sadhu ,  Herschel Akiba Ainspan ,  Zheng Xu ,  Armagan Dascurcu ,  Gary Kurtzman

IPC: H03L7/18 ,  H03B5/12

CPC classification number: H03L7/18 ,  H03B5/1228 ,  H03B5/1296

Abstract: A Voltage-Controlled Oscillator (VCO) includes a cross-coupled transconductance cell. A transformer comprising a primary coil and at least one secondary coil, wherein the primary coil is connected to the cross-coupled transconductance cell. A primary coil varactor is connected to the cross-coupled transconductance cell in parallel to the primary coil. A variable inductive tuning component connected to the at least one secondary coil. A mode switch connected to the at least one secondary coil and configured to select a frequency mode of operation of the VCO by engaging or disengaging the variable inductive tuning component from operation with the primary coil varactor to generate oscillation at a center frequency of the VCO.