公开(公告)号：US20240113660A1

公开(公告)日：2024-04-04

申请号：US18296539

申请日：2023-04-06

Applicant: NXP USA, Inc.

Inventor： Divya Tripathi ,  Sadique Mohammad Iqbal ,  Anubhav Srivastava ,  Krishna Thakur

IPC: H03B5/04 ,  H03B5/24

CPC classification number: H03B5/04 ,  H03B5/24

Abstract: A self-biased, closed loop, low current free running oscillator clock generator method and apparatus are provided with a current mode comparator connected to a trimming resistor and configured to compare an internally generated voltage reference VREF signal to a voltage feedback signal VFB, where the current mode comparator comprises a common gate amplifier connected to a current mirror circuit in a negative self-biased closed loop to generate a control current signal for controlling a current controlled oscillator to produce an output clock signal having a clock frequency based on the control current signal, where a frequency-to-voltage converter is connected in a feedback path to receive the output clock signal and is configured to produce the voltage feedback signal VFB for input to the current mode comparator, wherein the clock frequency of the output clock signal is tuned to a nominal locked output frequency fOUT by the trimming resistor.

公开(公告)号：US20240388252A1

公开(公告)日：2024-11-21

申请号：US18509014

申请日：2023-11-14

Applicant: NXP USA, Inc.

Inventor： Sadique Mohammad Iqbal ,  Divya Tripathi ,  Anubhav Srivastava ,  Krishna Thakur

IPC: H03B5/24 ,  H03B5/04 ,  H03K19/0175

Abstract: Systems and methods for providing temperature compensation in oscillators circuits are discussed. In various embodiments, these systems and methods may be implemented in technologies where only resistors with the same type (positive or negative) of temperature coefficients of resistance are available. For example, in some implementations, an oscillator circuit may include a voltage generator coupled to an input terminal of a common gate amplifier through a first resistor, and a frequency-to-voltage converter coupled to another input terminal of the common gate amplifier through a second resistor, where the second resistor may be configured to reduce a frequency variation of the oscillator circuit in response to temperature changes.