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# O8s - you VHS Figure 1 Reference current source circuit VDD...

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Unformatted text preview: + you - _ VHS Figure 1: Reference current source circuit; + VDD = 5 V, *VSS = —5 V, VRH.‘ = l V; M] and M; are two identical NMOS transistors; in the aetivefsaturation region the drain current is given by: ID = K( V03 — V02, where V,=1v,K= 100 um? (a) [1] In Fig.1, label + and a inputs of the op-amp so that the circuit operates as a reference current source. (b) [2] Assuming that all components are ideal and that M1 and M3 operate in the activefsaturation region, ﬁnd an expression for Iggy. Find R so that [REF = 100 pA. I“ = Var/Q mall W, m ,1. ad - IKEF :— Y? ’ R: ‘0 KJL ”l: ”JM'HL H H [Kim‘s M‘Nof“ I, '— ' Curr 'L YEP :31 (c) l2] Suppose that all components are ideal, except that the op-amp input offset voltage is V03 = 75 mV. Find the relative tolerance Alggﬂggp Vu¥+VDJ £5th 9- FBTIECF V _ Yo_5__ -; j: SMV : if. O‘SI/o j R .___ ____ . = —“ «##— o r c R. Ian: VHF Was 5 V9” 1‘ V (d) [2] Suppose that temperature drifts in all components except R can be neglected. Assuming TCF(R) = +2000 ppmfoC, ﬁnd TCAIREF) Vﬁ: F3. _ bran“ ‘l _ R mfi 1: —\§—- —— 3—- =_'T [a : TCF (Tart) — 1 :1. — Ten: *ﬂqﬁ DT V? liq“ 15"." 2:00} / 3:. — {I ”C (e) [1] Is it necessary for the op-amp in Fig. 1 to have a rail-to-rail output voltage swing? (Just answer YES or NO, there is no need to justify the answer) No_ (sz : \/,,.mlW/K = w, So Va stage at,“ 4:55 mu met L069...) +Vm (f) [1] Is it necessary for the op-amp in Fig. 1 to have a rail-to-rail input common mode voltage range? (Just answer YES or NO, there is no need to justify the answer) No. V(+) : VC—ﬁ = 525 urea Carlson: FVs; m4 “H.121 leaﬂet.) 4*me (g) [1] Find the maximum value of RL such that [REF = 100 “A, I'm: 3“. Trust; bouv‘dﬂd}: V6.91 -_: \Lt } VG- -_-_ *‘4‘55 +VG—S .-. =V\$S*V't“\‘lf = V)2_u~:u = VG- V-t 2 —"+\" .— \l «M‘h V RLWDK = M '7‘ L :1 Clo NL- Iacrr lG-OFA ...
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