Sinusoidal waveform the reference signal

326		(b)	Fig. 8 (a) Effect of buck switching power converter with fx ∼= 3 MHz, f0 = 10 MHz and fs = 15 MHz upon a CDMA envelope signal (b) Design space exploration for the output signal spectrum	L. Marco et al.
326		(a)		L. Marco et al.

Wideband Efficient Amplifiers for On-Chip Adaptive Power Management Applications																		327
Q1		Q3	g4		L3L	+	g1		Vin-VC			VC			Vin-VC		VC
Q1		Q3					g3
g1		g3		Q4			VSW											Vin
						Vout	VSW											Vin
							(D < 0.5)											Vin/2
		Cx					(D < 0.5)											Vin/2
Vin			g2	Q2		R	g1											Vin
	_V C					R
						_
						_	g3
VSW								VC	Vin	Vin-VC			Vin	VC	Vin	Vin-VC	Vin
VSW								VC	Vin	Vin-VC			Vin	VC	Vin	Vin-VC	Vin	Vin /2
(D > 0.5)																		Vin /2
0											Ts/2				Ts			t
(a)									(b)									t

1 V three level buck 1.0V three level buck

0.5 V

3.0 mV

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

0 V

100 ms