An On-Chip CMOS Relaxation Oscillator With Voltage Averaging Feedback

Tokunaga, Yusuke; Sakiyama, Shiro; Matsumoto, Akikazu; Dosho, Shiro

doi:10.1109/jssc.2010.2048732

Cited by 161 publications

(63 citation statements)

References 13 publications

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“…As is shown in Figure 4, the proposed circuit is the relaxation oscillator [13][14][15] which can control its frequency by charging and discharging the capacitor. At the initial time, it can be assumed that the voltage of capacitor C is zero, the switching control signal XA makes the two top switches close, a current I charge charges the capacitor C, when the voltage of C exceeds the threshold V1, the output of COMP1 generates a high level signal A to make the two switches below in the figure 4 close.…”

Section: Design Of the Oscillatormentioning

confidence: 99%

An Offline Current-Mode PFM Controller for Low Power Residential LED Lighting with Primary-Side Constant Current Regulation Techniques

Zhao

Lai

2013

IJSH

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Section: Design Of the Oscillatormentioning

confidence: 99%

An Offline Current-Mode PFM Controller for Low Power Residential LED Lighting with Primary-Side Constant Current Regulation Techniques

Zhao

Lai

2013

IJSH

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“…Off-chip crystal oscillators provide a stable frequency of tens of megahertz but are not suitable for MDDIs due to their cost, size, and long start-up time [1]. Several onchip oscillators have been investigated as alternative solutions [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…Several onchip oscillators have been investigated as alternative solutions [1][2][3]. A relaxation oscillator with bandgap reference (BGR) generates a stable frequency using a voltage and current reference circuit [2].…”

Section: Introductionmentioning

confidence: 99%

“…However, it neglects to consider the delay of the comparator and RSlatch, thereby resulting in an inaccurate frequency of the oscillator. In [1], a voltage averaging feedback constantly maintains the oscillation frequency by adjusting the control signal but requires a long start-up time due to the feedback operation. A relaxation oscillator with a feedforward period controller in [3] achieves a short start-up time of one cycle period, which is suitable for intermittent operation systems, but generates a low frequency of 100 kHz.…”

Section: Introductionmentioning

confidence: 99%

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A 70 MHz Temperature-Compensated On-Chip CMOS Relaxation Oscillator for Mobile Display Driver ICs

Chung¹,

Hong²,

Kwon³

2016

JSTS:Journal of Semiconductor Technology and Science

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Abstract-A 70 MHz temperature-compensated onchip CMOS relaxation oscillator for mobile display driver ICs is proposed to reduce frequency variations. The proposed oscillator compensates for frequency variation with respect to temperature by adjusting the bias currents to control the change in delay of comparators with temperature. A bandgap reference (BGR) is used to stabilize the bias currents with respect to temperature and supply voltages. Additional temperature compensation for the generated frequency is achieved by optimizing the resistance in the BGR after measuring the output frequency. In addition, a trimming circuit is implemented to reduce frequency variation with respect to process. The proposed relaxation oscillator is fabricated using 45 nm CMOS technology and occupies an active area of 0.15 mm 2 . The measured frequency variations with respect to temperature and supply voltages are as follows: (i) ±0.23% for changes in temperature from -30 to 75°C, (ii) ±0.14% for changes in V DD1 from 2.2 to 2.8 V, and (iii) ±1.88% for changes in V DD2 from 1.05 to 1.15 V.

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“…Onchip reference oscillators are required for low-cost onechip applications including biomedical sensors, microcomputers, high-speed interfaces such as DDR I/F and HDMI, and SoCs. RC oscillators, including relaxation oscillators, were developed to realize on-chip oscillators with a standard CMOS process [2]. The oscillator used in the analog circuit can be divided into two main circuits, which are the LC oscillator and RC oscillator.…”

Section: Introductionmentioning

confidence: 99%

High accuracy, Low Power Spread Spectrum Clock Generator to Reduce EMI for Automotive Applications

Lee¹,

Choi²,

Oh³

et al. 2014

IEIE Transactions on Smart Processing and Computing

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This paper presents a Spread Spectrum Clock Generator (SSCG) based on Relaxation oscillator using Up/Down Counter. The current is controlled by a counter and the spread spectrum of the Relaxation Oscillator. A Relaxation Oscillator with temperature compensation using the BGR and ADC is presented. The current to determine the frequency of the Relaxation Oscillator can be controlled. The output frequency of the temperature can be compensated by adjusting the current according to the temperature using the code that is the output from the ADC and BGR. EMI Reduction of SSCG is 11 dB, and Spread down frequency is 150 kHz. The current consumption is 600 μA from 5V and the operating frequency is from 2.3 MHz to 5.75 MHz. The rate of change of the output frequency with temperature was approximately ±1 %. The SSCG is fabricated in a 0.35um CMOS process with active area 250um x 440um.

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An On-Chip CMOS Relaxation Oscillator With Voltage Averaging Feedback

Cited by 161 publications

References 13 publications

An Offline Current-Mode PFM Controller for Low Power Residential LED Lighting with Primary-Side Constant Current Regulation Techniques

An Offline Current-Mode PFM Controller for Low Power Residential LED Lighting with Primary-Side Constant Current Regulation Techniques

A 70 MHz Temperature-Compensated On-Chip CMOS Relaxation Oscillator for Mobile Display Driver ICs

High accuracy, Low Power Spread Spectrum Clock Generator to Reduce EMI for Automotive Applications

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