A novel approach to reduce power consumption in level shifter for Multiple Dynamic Supply Voltage

Terres, Marco; Meinhardt, Cristina; Bontorin, Guilherme; Reis, Ricardo

doi:10.1109/icecs.2013.6815514

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…In this circuit, cascode current source is applied in the level shifter (Terres et al, 2013;Bharathi and Vijay, 2014;Hosseini et al, 2014) to reduce the switching current in low power supply. The cascode circuit is usually applied for the current-buffering property and superior frequency response.…”

Section: Low-frequency Broad-band Noisementioning

confidence: 99%

Application of cascode level shifter for EMI reduction in LCD driver IC

Kim

Choi

et al. 2015

Microelectronics International

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Purpose -This paper aims to design the circuit for electromagnetic interface (EMI) reduction in liquid crystal display (LCD). Design/methodology/approach -The cascode level shifter and segmented driver circuit are applied in LCD column driver integrated circuit (IC) for EMI reduction. Cascode current mirror is used in the proposed level shifter for DC voltage biasing and reduction of the driving current which passes through the level shifter. The on-off switching currents and transient times are measured and compared between the conventional and proposed level shifters. Additionally, a segmented data latch is obtained by the timing spread solution in data latch, and applied to split the large peak switching current into a number of smaller peak current. The timing spread-operation does not actually reduce the total power of the noise, instead, it spreads the noise power evenly over the frequency bandwidth. The optimal number of latch is dependent on the operating frequency and EMI allowance. The column driver IC and clock controller are integrated in 0.18 m CMOS technology with 1-poly and 4-metal process. Findings -The post-layout simulation shows that the proposed column driver circuit for LCD driver IC significantly reduces the peak switching current, and it results in the reduction of EMI noise level by more than 15 dB. It is obtained with 20 segmented operations in data latch at 40 MHz frequency. Originality/value -The advantage of the cascode current source is that it can provide a well-controlled bias current with an accurate current transfer ratio. To reduce the EMI noise in LCD driver circuit, the cascode current source is properly located for the DC bias block in the level shifter. The application is rarely done by others, and a significant EMI noise reduction is found. The well-controlled current source provides a high performance switching in the level shifter.

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Section: Low-frequency Broad-band Noisementioning

confidence: 99%

Application of cascode level shifter for EMI reduction in LCD driver IC

Kim

Choi

et al. 2015

Microelectronics International

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Exploring more efficient architectures for Multiple Dynamic Supply Voltage designs

Terres

Meinhardt

Bontorin

et al. 2014

2014 IEEE 5th Latin American Symposium on Circuits and Systems

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Multiple Dynamic Supply Voltage (MDSV) is a technique that focuses on reducing the dynamic power. This technique is an evolution of the Multiple Supply Voltage (MSV). MSV and MDSV introduce some difference on traditional physical synthesis due to the different voltage operations of each region in the design. To convert the voltage among regions supplied by different voltages, these techniques insert a Level Shifter (LS) circuit. As a penalty consequence, traditional LS circuits insert a delay and extra power consumption in the design. The dynamical behavior of MDSV designs has brought a new condition, where LS inserted in the circuit can be in an idle state temporally. This work presents a new architecture to reduce the power consumption and delay, bypassing the LS. The architecture explores an alternative path to current flow in the cases that LS is idle. With this new approach we reduce up to 15% of power consumption and up to 75% and 15% of delay.

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A novel approach to reduce power consumption in level shifter for Multiple Dynamic Supply Voltage

Cited by 2 publications

References 12 publications

Application of cascode level shifter for EMI reduction in LCD driver IC

Application of cascode level shifter for EMI reduction in LCD driver IC

Exploring more efficient architectures for Multiple Dynamic Supply Voltage designs

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