公开(公告)号：US11923861B1

公开(公告)日：2024-03-05

申请号：US18164211

申请日：2023-02-03

Applicant: QUALCOMM Incorporated

Inventor： Hao Liu ,  Lejie Lu ,  Yu Song ,  Dong Ren

IPC: H03L7/099 ,  H03L7/089 ,  H03L7/091

CPC classification number: H03L7/0995 ,  H03L7/0891 ,  H03L7/091

Abstract: A voltage controlled oscillator (VCO), including: at least one second upper voltage rail; at least one second lower voltage rail; a ring of N cascaded inverters, wherein the set of N cascaded inverters are coupled between the at least one second upper voltage rail and the at least one second lower voltage rail; at least one first frequency band select circuit coupled between first upper voltage rail and the at least one second upper voltage rail; at least one second frequency band select circuit coupled between the at least one second lower voltage rail and first lower voltage rail; at least one first VCO frequency control circuit coupled between the first upper voltage rail and the at least one second upper voltage rail; and at least one second VCO frequency control circuit coupled between the at least one second lower voltage rail and the first lower voltage rail.

公开(公告)号：US12052023B1

公开(公告)日：2024-07-30

申请号：US18158662

申请日：2023-01-24

Applicant: QUALCOMM Incorporated

Inventor： Lejie Lu ,  Hao Liu ,  Yu Song ,  Dong Ren

IPC: H03L7/18 ,  H03L7/093 ,  H03L7/099 ,  H03L7/187

CPC classification number: H03L7/187 ,  H03L7/093 ,  H03L7/0992

Abstract: A clock recovery circuit includes a frequency tracking loop including a first charge pump, and a phase tracking loop including a second charge pump. A voltage-controlled oscillator responds to the frequency tracking loop in a first operating mode and to the phase tracking loop in a second operating mode. A lock detector outputs an activation signal that indicates whether the clock recovery circuit has acquired frequency lock. A loop filter coupled to an input of the voltage-controlled oscillator includes a switchable resistor and a programmable delay element responsive to the activation signal. The first charge pump is disabled when the activation signal indicates frequency lock has been acquired, and disabled when the activation signal indicates frequency lock has not been acquired. The switchable resistor is bypassed when an output of the programmable delay element is in the first signaling state.

公开(公告)号：US11863356B2

公开(公告)日：2024-01-02

申请号：US17589782

申请日：2022-01-31

Applicant: QUALCOMM Incorporated

Inventor： Miao Li ,  Zhiqin Chen ,  Yu Song ,  Hongmei Liao ,  Zhi Zhu ,  Hao Liu ,  Lejie Lu

IPC: H04L25/03

CPC classification number: H04L25/03057 ,  H04L25/03885

Abstract: A receiver has a first equalizer circuit that includes a first stage having a source degeneration circuit and a trans-impedance amplifier (TIA). The source degeneration circuit includes a resistor coupled in parallel with a capacitor. The TIA includes an embedded variable gain amplifier with a gain controlled by feedback resistors. Each feedback resistor is coupled between input and output of the TIA. In some implementations, the receiving circuit has a second equalizer circuit coupled in series with the first equalizer circuit. The second equalizer circuit includes a first stage having a source degeneration circuit and a TIA. The source degeneration circuit in the second equalizer circuit has a source degeneration resistor coupled in parallel with a source degeneration capacitor and the TIA includes an embedded variable gain amplifier whose gain is controlled by feedback resistors coupled between input and output of the TIA in the second equalizer circuit.