List of known errors and corrections for
Analysis and Design of Analog Integrated Circuits, Fourth Edition,
P. R. Gray, P. J. Hurst, S. H. Lewis, and R. G. Meyer
Wiley, New York, 2001.

• Posted on January 3, 2002
  1. In Problem 4.11 on page 338, the following sentence should be added:
     For $M_2$, assume $V_{t0} = -1$ V.

  2. In Figure 5.9 on page 357, the label $V_{DD} + V_{ov1}$ on the $V_o$ axis should be $V_{DD} - V_{ov1}$.

  3. Equation 5.101 on page 383 is incorrect. To correct it, square roots should be added to each term inside the parentheses and both the numerator and the denominator of the fraction should be squared. The equation should be:

     
     

     $$I _ {D1} = I _ {D4} \frac {\displaystyle \left( {\sqrt \frac... ...} + {\sqrt \frac 1 {k'_p (W/L)_2}} ~ \right)^2} \eqno{(5.101)}$$
     
     

  4. Equation 6.68 on page 430 is incorrect. The order of the terms should be reversed in the equation and in a sentence before the equation. The correction should read:

     To find the systematic offset voltage at the op-amp output, the output voltage in (6.67) should be subtracted from a voltage midway between the supplies. To refer the systematic offset voltage to the op-amp input, this difference should be divided by the op-amp gain. The result is

     
     

     $$V_{OS(sys)} = \frac {{\displaystyle \frac {V_{DD} - V_{SS}} 2} - ({V_{t3} + V_{ov3} - V_{SS})}} {A_v} \eqno{(6.68)}$$
     
     

• Posted on April 8, 2002
  1. On page 288, seven lines above the end of Section 4.3.5.1 ``... $I_{TAIL}/2$ flows in each of side of ...'' should be
     ``... $I_{TAIL}/2$ flows in each side of ...''

  2. On page 498, Figure 7.10(b): The voltage across capacitor $C_{gs}$ is labeled $v_i$ but should be labeled $v_1$.

  3. On page 768 (middle): "the correlation my be neglected in any case" should be
     "the correlation may be neglected in any case".

  4. On page 824, Figure 12.16. The lower figure should be labeled as (b) rather than (a).

  5. On page 824, Figure 12.36(b): The controlled source $a_{cm} v _{ic}$ should be $a_{cm}' v _{ic}$.

• Posted on September 4, 2002
  1. Equation 12.1 on page 809 is incorrect. The correct equation is:

     
     

     $$\overline{v_{oN}^2}(s.e.) = \left( {R_3\over R_1} \right)^2 4 kT\!R_1 (BW_N)\eqno{(12.1)}$$
     
     

  2. Equation 12.2 on page 810 is incorrect. The correct equation is:

     
     

     $$\overline{v_{oN}^2}\hbox{({\it diff})} = 2 \left( {R_3\over R_1} \right)^2 4kT\!R_1 (BW_N)\eqno{(12.2)}$$
     
     

• Posted on December 5, 2002

  Equation 7.3 on page 489 is incorrect. (The numerator is wrong.) The correct equation is:

  
  

  $$A_v (s) = \frac{v_o}{v_1} = - g_m R_L \left( \frac { 1 - s \frac{C_f}{g_m} } { 1 + s R_L C_f } \right) \eqno{(7.3)}$$
  
  

• Posted on April 10, 2003

  The last paragraph on page 390 and the first line on page 391 are incorrect. They should be replaced with:
  
  
  

  To find the gain of the error amplifier, the key observation is that the small-signal resistance looking into the source of $M_{15}$ is zero ignoring channel-length modulation. This result stems from the operation of the same negative feedback loop that biases the gate of $M_{15}$. If the small-signal voltage at the source of $M_{15}$ changes, the negative feedback loop works to undo the change. For example, suppose that the source voltage of $M_{15}$ increases. This change reduces the gate voltage of $M_{15}$ because $M_{17}$ operates as a common-source amplifier. Then the source voltage of $M_{15}$ falls because $M_{15}$ operates as a source follower. Ignoring channel-length modulation, the source voltage of $M_{15}$ must be held exactly constant because $i_{d17} =0$ if $I_{BIAS}$ is constant. Therefore, the small-signal resistance looking into the source of $M_{15}$ is zero. As a result, none of the small-signal drain current from $M_{12}$ flows in $M_{13}$. Instead, it all flows in the source of $M_{15}$. To calculate the transconductance of the error amplifier, the output at the drain of $M_{16}$ is connected to a small-signal ground. Since $M_{15}$ and $M_{16}$ share the same gate connection, and since their sources each operate at small-signal grounds, the small-signal current in $M_{15}$ is copied to $M_{16}$. Therefore, the entire small-signal current from the differential pair flows at the error-amplifier output and the transconductance is

• Posted on August 11, 2003
  1. Equation 11.121 on page 792 is incorrect. (A '1' should be added to the term inside the parantheses.) The correct equation is:

     
     

     $$\overline{ v^2 _ {1/f} } = \frac{2 K_p}{f W_1 L_1 C_{ox}} \l... ...{L_1}^2 }{ K_p \mu_p {L_3}^2 } \right) \Delta f \eqno{(11.121)}$$
     
     

• Posted on September 12, 2003

  In Figure 1.3 on page 6, ``Foward'' Bias should be Forward Bias.