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dutycycle correction

1. DUTY CYCLE CORRECTION USING ASIC FOR HIGH SPEED COMMUNICATION Presented by Gunde Mounika

2. Abstract Introduction Methodology Duty Cycle Applications Conclusion Contents

3. It is applied as a percentage of the measured average power of a modulated signal to obtain the signal power. This circuit uses two stages of correction, with the first stage performing course correction and the second stage performing fine corrections. This allows the power to be determined during the pulse given the measurement of the average power of a modulated signal with a known duty cycle. In this analysis, the duty cycle correction circuits and their significance in Application Specific Integrated Circuit (ASIC) design. ABSTRACT

4. The digital correction circuit is more reliable, simpler to use, and capable of higher-frequency resolution improvement. This is crucial for high-speed circuits and logic families because it determines how much time is allotted for the pre-charge and evaluation phases; If this time is off from the desired value, performance will suffer. The clock signal can be further weakened by environmental and process variables, making it challenging to produce and disseminate high-frequency clocks with a fixed duty cycle Before providing the clock signals to the sensitive parts of the design, the duty cycle value was measured. INTRODUCTION

5. The measurement is based on a specific logic, and once the measurement is performed based on the duty cycle value, the clock switches to the correction circuit, this correction can be controlled using a controller. The required amount of correction was controlled by selecting bits from 0 to 15. The selection of each bit corrects the input clock signal by a fixed amount. the clock switches to the correction circuit . The DCC circuit is designed for high-speed interfaces such as the Universal Serial Bus (USB) and Peripheral Component Interconnect Express (PCIE) The DCC has improved stability, correction range, and operating frequency compared to mixed-signal and all-digital DCCs. Contd .,

6. A small and compact automated home system controller that combines comfort, security, and an automated load transfer switch was proposed and designed under an Application Specific Integrated Circuit (ASIC) design flow. A dual feedback loop with a differential input clock was added to reduce the impact of charge pump imbalance on circuit performance. A chopping technique was also introduced to improve the loop gain while suppressing the DC offset in the feedback loop. Furthermore, a novel Duty-Cycle Adjuster (DCA) with configurable load capacitance was presented to maintain the duty-cycle correction range over a wide frequency range. The proposed DCC was implemented in a 65-nm CMOS process with a 1-V supply voltage. proposed an analog duty-cycle correction circuit using a novel pulse-width modification cell.

7. Methodology 90 nm Technology Leading semiconductor companies, such as Toshiba, Sony, Samsung, IBM, Intel, Fujitsu, TSMC, Elpida , AMD, Infineon, Texas Instruments, and Micron Technology, have commercialized the 90 nm process for MOSFET (CMOS) production between 2003 and 2005, with a historic and associated 70% upward trend every two to three years. The significant costs associated with this change were reflected in performance concerns. Cadence Virtuoso System Design Platform It is a system based solution that provides functionality to drive the simulation of ICs and packages from a single schematic. There are two key steps: implementation and analysis.

8. Duty cycle is  the ratio of time a load or circuit is ON compared to the time the load or circuit is OFF . Duty cycle, sometimes called "duty factor," is expressed as a percentage of ON time. A 60% duty cycle is a signal that is ON 60% of the time and OFF the other 40%. Duty Cycle= ON time / (ON time + OFF time) The idea of duty cycle correction circuits, its significance Period = 1/Frequency period = T + T on off D uty cycle = T (T +T ) *100 (in percentage) Duty Cycle

9. Circuit Diagram of Duty Cycle Adjuster

10. Output for Time Period with On and Off Position Duty Cycle Adjustment by Delay Line

11. Applications In real-time systems, where precise timing is important, duty-cycle correction circuits have a wide range of applications. High-speed communication systems are constructed in the duty-cycle correction circuit that is used in high-speed communication systems to ensure accurate timing for data transmission. Digital signal processing is used in digital signal processing applications to improve the accuracy and efficiency of operations such as filtering, modulation, and demodulation. The accurate timing of microprocessors and microcontrollers is essential for executing instructions and controlling peripherals. Test and measurement equipment is used in test and measurement equipment to generate and measure signals with high precision by ensuring accurate timing.

12. A duty-cycle correction circuit was proposed in this, which was used to correct the inconsistencies caused by environmental and process fluctuations in the duty cycle. The results indicate that less than 1% can be used to adjust the duty cycle of the input clock from 15 to 63%. The loop could accurately output a 50% duty cycle for a wide range of input duty cycles. The adjuster circuit is used in the duty-cycle correction circuit to alter the duty cycle of the input clock and is responsible for controlling the delay between the two complementary signals. The circuit is more resilient and capable of producing a very fine resolution when compared to analog techniques currently used for duty-cycle correction. Conclusion