VDD VDD Vref R Q n Q x
- Slides: 15
VDD VDD Vref - + R Q n. Q x. R n. Q
Cascoded CM Cascoded CG amplifier Make x*ln(n) 26 Can change M 7 -M 10 to wide swing cascode connections to accommodate lower supply voltages.
Chapter 7 Figure 15 Polarity is wrong.
Banba, Hironori, Hitoshi Shiga, Akira Umezawa, Takeshi Miyaba, Toru Tanzawa, Shigeru Atsumi, and Koji Sakui. "A CMOS bandgap reference circuit with sub-1 -V operation. " Solid-State Circuits, IEEE Journal of 34, no. 5 (1999): 670 -674.
Noise in time domain
d. Bm is a unit used to measure physical power relative to 1 m. W. For exampl, if 2 V is applied to 50 , the physical power is: P= 2^2/50 W = 4*20 m. W P (d. Dm) = 10 log(P/1 m. W) = 10 log(80) = 10 log(2^3*10) = 3*3. 01 +10 =19. 03 d. Bm
For a given v(t), define: vf(t) v(t) f The power spectral density of v is: Pv(f) = power of vf(t) = power of v(t) in a one Hertz bandwidth at f The total power of v can be obtained by integrating Pv(f) over all f. Pv(f) Pv = 10*1 M + 0. 5*10*1 M = 15 M (u. V)2=15(m. V)2 10(u. V)2/Hz Area 0 1 MHz 2 MHz
If the power spectral density of vn is flat (ind of f), vn is called white. vn(t) Pvn(f)
d. Bm or d. BV 2 Slope: 10 d. B/dec log(f)
1/f noise corner: the intersection of 1/f noise power spectral density and white noise power spectral density d. Bm or d. BV 2 Slope: 10 d. B/dec 1/f noise corner log(f)
Filtered noise: Time domain spectrum
-20 d. B/dec
Filtered noise: Chapter 9 Figure 06 Chapter 9 Figure 07
R 1 VDC + - R 3 R 2 Vo
