公开(公告)号：US20040263264A1

公开(公告)日：2004-12-30

申请号：US10603238

申请日：2003-06-24

Applicant: STMicroelectronics, Inc.

Inventor： Rong Yin ,  Mehdi Zamanian

IPC: H03B001/00

CPC classification number: H03B5/36 ,  H03B5/06

Abstract: A method and circuit are disclosed for enabling an oscillator circuit to oscillate a predetermined period of time following completion of a power-up operation. The circuit may include a counter having a control for receiving a control signal from a system power-on-reset circuit, and a clock input. A ring oscillator has an output coupled to the clock input of the counter.

Abstract translation: 公开了一种方法和电路，用于使振荡器电路能够在上电操作完成之后的预定时间段内振荡。 电路可以包括具有用于从系统上电复位电路接收控制信号的控制器和时钟输入的计数器。 环形振荡器具有耦合到计数器的时钟输入的输出。

公开(公告)号：US20020158673A1

公开(公告)日：2002-10-31

申请号：US09846524

申请日：2001-04-30

Applicant: STMicroelectronics, Inc.

Inventor： David C. McClure ,  Rong Yin

IPC: H03K005/153

CPC classification number: G01R19/16547

Abstract: A circuit and method are disclosed for monitoring the voltage level of an unregulated power supply. The circuit includes a voltage reference circuit for generating a first reference voltage signal and a trim circuit which generates a trimmed reference voltage signal based upon the first reference voltage signal. A comparator compares the unregulated power supply voltage to the trimmed reference voltage signal and asserts an output signal based upon the comparison. The output signal is fed back as an input to the trim circuit so that the trim circuit provides a hysteresis effect.

Abstract translation: 公开了一种用于监测未调节电源的电压电平的电路和方法。 电路包括用于产生第一参考电压信号的电压参考电路和基于第一参考电压信号产生修整的参考电压信号的微调电路。 比较器将未调节的电源电压与修整的参考电压信号进行比较，并根据比较确定输出信号。 输出信号作为输入反馈到微调电路，使得微调电路提供滞后效应。

公开(公告)号：US20040263271A1

公开(公告)日：2004-12-30

申请号：US10603281

申请日：2003-06-24

Applicant: STMicroelectronics, Inc.

Inventor： Rong Yin

IPC: H03B005/32

CPC classification number: H03B5/36

Abstract: A circuit and method are disclosed for controlling current dissipated by an oscillator circuit. The circuit includes a current source adapted to source current to or sink current from the oscillator circuit. A control circuit is adapted to count a predetermined period of time following the occurrence of an event, such as completion of a power-up operation. An output of the control circuit, having a value indicative of whether the predetermined period of time has elapsed, is coupled to a control input of the current source. In this way, the output of the control circuit sets a current level sourced to or sunk from the oscillator circuit by the current source.

Abstract translation: 公开了一种用于控制由振荡器电路消耗的电流的电路和方法。 电路包括适于从振荡器电路馈送电流或吸收电流的电流源。 控制电路适于对事件发生之后的预定时间段进行计数，诸如完成上电操作。 具有指示预定时间段是否经过的值的控制电路的输出被耦合到当前源的控制输入。 以这种方式，控制电路的输出设置由电流源从振荡器电路提供或从其沉没的电流电平。

公开(公告)号：US20040263267A1

公开(公告)日：2004-12-30

申请号：US10603239

申请日：2003-06-24

Applicant: STMicroelectronics, Inc.

Inventor： Rong Yin ,  Thomas Allyn Coker

IPC: H03B001/00

CPC classification number: G01R23/15

Abstract: A method and circuit are disclosed for detecting the performance of an oscillator circuit. In particular, the circuit may detect a signal, such as the output of the oscillator circuit, failing to oscillate as desired. The second circuit may be capable of detecting whether the signal oscillates at a frequency that is less than a predetermined frequency. The second circuit may include timing circuits for determining whether the signal remains in a first logic state for at least a predetermined period of time and whether the signal remains in a second logic state for at least the predetermined period of time.

Abstract translation: 公开了一种用于检测振荡器电路的性能的方法和电路。 特别地，电路可以检测诸如振荡器电路的输出的信号，如期望的那样不能振荡。 第二电路可能能够检测信号是否以小于预定频率的频率振荡。 第二电路可以包括用于确定信号是否保持在第一逻辑状态至少预定时间段的定时电路，以及该信号是否在至少预定时间段内保持在第二逻辑状态。