公开(公告)号：US09612607B2

公开(公告)日：2017-04-04

申请号：US13929772

申请日：2013-06-27

Applicant: Texas Instruments Incorporated

Inventor： Ajay Kumar ,  Rahul Bhandarkar

IPC: G05F3/08 ,  G05F3/30

CPC classification number: G05F3/30 ,  G05F3/08

Abstract: A simple bandgap current generator combines a PTAT (proportional to absolute temperature) base-emitter voltage (VBE) measured across two binary junction devices (ΔVBE=VBE1−VBE2) with a current that is varied by an nWell resistor with a positive temperature coefficient to produce a CTAT (complementary to absolute temperature) current instead of PTAT reference current. One of the base-emitter voltages is constrained to be VBE1=VBE(1βT). This reduces the temperature dependency of a reference current generated by the bandgap generator. This reference current may be used to generate a bandgap reference voltage by adding an IR drop to a diode voltage or to a base-emitter voltage. The simple bandgap circuit is significantly smaller in size than a precision bandgap circuit, but still provides a voltage and/or a current reference signal having a good accuracy.

公开(公告)号：US20150002130A1

公开(公告)日：2015-01-01

申请号：US13929772

申请日：2013-06-27

Applicant: Texas Instruments Incorporated

Inventor： Ajay Kumar ,  Rahul Bhandarkar

IPC: G05F3/08

CPC classification number: G05F3/30 ,  G05F3/08

Abstract: A simple bandgap current generator combines a PTAT (proportional to absolute temperature) base-emitter voltage (VBE) measured across two binary junction devices (ΔVBE=VBE1-VBE2) with a current that is varied by an nWell resistor with a positive temperature coefficient to produce a CTAT (complementary to absolute temperature) current instead of PTAT reference current. One of the base-emitter voltages is constrained to be VBE1=VBE(1-βT). This reduces the temperature dependency of a reference current generated by the bandgap generator. This reference current may be used to generate a bandgap reference voltage by adding an IR drop to a diode voltage or to a base-emitter voltage. The simple bandgap circuit is significantly smaller in size than a precision bandgap circuit, but still provides a voltage and/or a current reference signal having a good accuracy.

Abstract translation: 简单的带隙电流发生器将跨两个二元连接器件（＆Dgr; VBE = VBE1-VBE2）测量的PTAT（与绝对温度成正比）的基极 - 发射极电压（VBE）与正电温度nwell电阻变化的电流相结合 系数产生CTAT（互补绝对温度）电流而不是PTAT参考电流。 一个基极 - 发射极电压被限制为VBE1 = VBE（1-＆bgr; T）。 这降低了由带隙发生器产生的参考电流的温度依赖性。 该参考电流可以用于通过将二极管电压或基极 - 发射极电压加上IR压降来产生带隙基准电压。 简单的带隙电路的尺寸明显小于精密带隙电路，但仍然提供具有良好精度的电压和/或电流参考信号。

公开(公告)号：US09520881B1

公开(公告)日：2016-12-13

申请号：US14927803

申请日：2015-10-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Abhijit Kumar Das ,  Krishnasawamy Nagaraj ,  Rahul Bhandarkar

IPC: H03L7/02 ,  H03K3/0231 ,  H03K3/011

CPC classification number: H03L7/02 ,  H03K3/011 ,  H03K3/0231 ,  H03L7/089

Abstract: A system for tuning an oscillator frequency. The system includes a trimmed calibration circuit comprising a comparator and trimmed delay element and calibration logic. The calibration logic is configured to receive an output of the comparator and control an on time and an off time of an oscillator based on the output of the comparator.

Abstract translation: 用于调谐振荡器频率的系统。 该系统包括修整的校准电路，其包括比较器和修整的延迟元件和校准逻辑。 校准逻辑被配置为接收比较器的输出，并且基于比较器的输出来控制振荡器的接通时间和关断时间。