Esercizi coppie differenziali - Parte V

Esercizi Svolti e Commentati:

Microelectronics (B. Razavi, Wiley 2014)

Capitolo 10 Coppie Differenziali

Parte V

01.

lambda = 0

vgs = -vx

vsg = +Ix r0f - vx

Ix + gm vx + vx / ro5 = 0

Ix + gm vx + Ix rof / ro5 - vx / ro5 = 0

(1 + rof / ro5) Ix = (gm + 1/ro5) vx

Vx / Ix = (1 + rof / ro5) / (gm + 1/ro5)

Av = -gm1 Rop || Ron.

52. TELESCOPIC CASCODE.

I_SS = 2uA

A_V = 200

u_nC_ox = 100 uA/V²u_pC_ox = 50 uA/V²lambda_n = 0.1 V^-1lambda_p = 0.2 V^-1

r_ON = 10Kr_Op = 5K

A_V = -g_m1(R_ON||R_Op)

R_Op ≈ g_m6r_o6r_o8R_ON ≈ g_m3r_o3r_o1

R_out = 1/(1/(g_mNr_oN) + 1/(g_mPr_oP)

g_mN/(1/(g_mNr_oN) + 1/(g_mPr_oP)) = 200.

1/(1/r_oN² + g_mN/g_mP 1/r_oP²) = g_mN/200.

g_mN/g_mP = sqrt((u_nC_oxI_SS(W/L)_N)/(u_pC_oxI_SS(W/L)_P))

u_nC_ox(W/L)_N = 120K

1/r_oN² + g_mN/g_mP 1/r_oP² = g_mN/200.

200(1/r_oN² + sqrt(2)/r_oP²) = g_mN => 0,0213 mS.

= sqrt(u_nC_oxI_SS(W/L))