05-ChargePump - Charge Pump Chern-Lin Chen ( ) Department...

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Chern-Lin Chen ( ) Department of Electrical Engineering & Graduate Institute of Electronics Engineering National Taiwan University e-mail - [email protected] office tel – +886-2-3366-3575 Charge Pump Mar. 23, 2010
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1 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Basic Voltage Doubler Charge - S1, S3 On & S2, S4 Off Discharge - S2, S4 On & S1, S3 Off V out = 2 V DD “Charge Pumps- An Overview,”
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2 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Cockcroft-Walton Charge Pump V out ~ 3·V DD J.D. Cockcroft, E.T. Walton, Production of high velocity positive ions, Proc. Roy. Soc. A, Vol. 136, pp. 619-630, 1932 .
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3 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Dickson’s Charge Pump J. Dickson, On-chip high-voltage generation in NMOS integrated circuits using an improved voltage multiplier technique, IEEE JSSC, vol.11, no.6, pp.374-378, 1976. V φ
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4 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Using MOS Diode taking advantage of V th < V F (V in –V th )C charge stored in C at V osc =0 I out V φ
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5 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Equivalent Circuit Upon CLK High V in -V th V out I out V th V φ C out I out V φ
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6 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Simplified Equivalent Circuit V in –V th +V φ -V th V out I out C C out assume Cout >> C & V out near constant C[(V in –V th +V φ -V th )–V out ]= I out /f osc V out =V in –V th + V φ -V th –I out /Cf osc
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7 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Practical Voltage Waveforms I out V φ V CLK V out V C
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8 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Example Exercise Find the V out expression, taking into account R L loading effect.
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This note was uploaded on 10/16/2010 for the course GRADUATE I Power IC taught by Professor Chern-linchen during the Fall '09 term at National Taiwan University.

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05-ChargePump - Charge Pump Chern-Lin Chen ( ) Department...

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