Name
Abstract | ||
|---|---|---|
Time-based control techniques for the design of high switching frequency buck converters are presented. Using time as the processing variable, the proposed controller operates with CMOS-level digital-like signals but without adding any quantization error. A ring oscillator is used as an integrator in place of conventional opamp-RC or G m-C integrators while a delay line is used to perform voltage to time conversion and to sum time signals. A simple flip-flop generates pulse-width modulated signal from the time-based output of the controller. Hence time-based control eliminates the need for wide bandwidth error amplifier, pulse-width modulator (PWM) in analog controllers or high resolution analog-to-digital converter (ADC) and digital PWM in digital controllers. As a result, it can be implemented in small area and with minimal power. Fabricated in a 180 nm CMOS process, the prototype buck converter occupies an active area of 0.24 mm2, of which the controller occupies only 0.0375 mm2. It operates over a wide range of switching frequencies (10-25 MHz) and regulates output to any desired voltage in the range of 0.6 V to 1.5 V with 1.8 V input voltage. With a 500 mA step in the load current, the settling time is less than 3.5 μs and the measured reference tracking bandwidth is about 1 MHz. Better than 94% peak efficiency is achieved while consuming a quiescent current of only 2 μA/MHz. |
Year | DOI | Venue |
|---|---|---|
2015 | 10.1109/JSSC.2014.2378216 | J. Solid-State Circuits |
Keywords | Field | DocType |
high efficiency,reference tracking bandwidth,cmos process,settling time,switching convertors,vco-based integrator,cmos integrated circuits,voltage to time conversion,high switching frequency,voltage-controlled oscillators,pulse-width modulated signal generation,flip-flop,analog controller,voltage 1.8 v,pid controller,high switching frequency buck converter,integrating circuits,load current,buck,ring oscillator integrator,time-based control technique,adc,pwm power convertors,ring oscillator,digital controller,delay line,analog-to-digital converter,time-based,voltage 0.5 v to 1.5 v,delay lines,size 180 nm,digital pwm,flip-flops,dc-dc converter,voltage controlled oscillator,pulse width modulation,bandwidth,control systems | Control theory,Ring oscillator,PID controller,Settling time,Control theory,Computer science,Integrator,Pulse-width modulation,Electronic engineering,Voltage-controlled oscillator,Buck converter | Journal |
Volume | Issue | ISSN |
50 | 4 | 0018-9200 |
Citations | PageRank | References |
11 | 1.12 | 7 |
Authors | ||
9 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Seong Joong Kim | 1 | 47 | 8.95 |
| Qadeer Khan | 2 | 39 | 8.01 |
| Mrunmay Talegaonkar | 3 | 123 | 15.61 |
| Amr Elshazly | 4 | 242 | 28.08 |
| Arun Rao | 5 | 48 | 8.29 |
| Nathanael Griesert | 6 | 21 | 3.20 |
| Greg Winter | 7 | 20 | 2.11 |
| William McIntyre | 8 | 32 | 5.40 |
| Pavan Kumar Hanumolu | 9 | 554 | 84.82 |