公开(公告)号：US20190334530A1

公开(公告)日：2019-10-31

申请号：US15966134

申请日：2018-04-30

Applicant: STMicroelectronics International N.V.

Inventor： Nitin GUPTA ,  Kapil Kumar TYAGI

IPC: H03L7/085 ,  H03L7/099

Abstract: A PLL includes a phase frequency detector (PFD) receiving an input signal and feedback signal, and producing a control signal. A charge pump receives the control signal and produces an initial VCO control. A loop filter generates a fine VCO control and intermediate output based upon the initial VCO control. A coarse control circuit includes an integrator having a first input receiving the intermediate output, a second input, and generating a coarse VCO control, a first switch coupling a reference voltage to the second input, a buffer buffering output of the integrator, and a second switch coupling output of the integrator to the second input of the integrator. A VCO receives the fine VCO control and the coarse VCO control, and generates an output signal having a frequency based thereupon. A feedback path receives the output signal and produces the feedback signal.

公开(公告)号：US20190113943A1

公开(公告)日：2019-04-18

申请号：US16217872

申请日：2018-12-12

Applicant: STMicroelectronics International N.V.

Inventor： Kapil Kumar TYAGI ,  Nitin GUPTA

IPC: G05F1/575 ,  G05F1/613

Abstract: An electronic device including a low dropout regulator having an output coupled to a first conduction terminal of a transistor, with a second conduction terminal of the transistor being coupled to an output node of the electronic device. A method for operating the device to switch into a power on mode includes: turning on the low dropout regulator, removing a DC bias from the second conduction terminal of the transistor, and turning on the transistor. A method for operating the device to switch into a power down mode includes: turning off the transistor, forming the DC bias at the second conduction terminal of the transistor, and turning off the low dropout regulator.

公开(公告)号：US20220385234A1

公开(公告)日：2022-12-01

申请号：US17750137

申请日：2022-05-20

Applicant: STMicroelectronics International N.V.

Inventor： Kapil Kumar TYAGI

IPC: H03B5/12 ,  H03L5/00

Abstract: A voltage controlled oscillator (VCO) has a VCO core and a tuning bank. The tuning bank includes first and second tuning capacitors. A main switch is coupled between the first and second tuning capacitors. The tuning bank also includes control switches that receive a control signal to selectively activate the tuning bank. The main switch receives a level-shifted control signal to activate the tuning bank.