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In AMIS CMOS 07 by Roman Prokop

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Presentation on theme: "In AMIS CMOS 07 by Roman Prokop"— Presentation transcript:

1 In AMIS CMOS 07 by Roman Prokop
Current mirror design In AMIS CMOS 07 by Roman Prokop

2 Simple current mirror Saturace

3 AMIS CMOS 07 param VT0 & KP = f (T, process) graphs
NMOS Process VT0 [V] Kp [A/V2] Temp [°C] Typ 0.75 27 Fast 0.7 -50 0.45 150 Slow 1.00

4 W/L calculation for typ parameters
Choose ∆VGS= 250 mV & ID= 20 μA

5 Ideal Vds1=Vds2 solution - Decrease the Vds influence  large L - cascoda

6 min. ∆VGS max. ∆VGS Then input current can vary between (even for fix (dummy) resistor R) 150°C hipo(min)IIN ↑ °C hipo(max)IIN ↓

7 How to get fixed voltage for current mirror biasing ?

8 How to get fixed voltage for current mirror biasing ?
better – doesn’t depend on Ucc

9 Matching hand calculation
Premise - 2 transistors in common centroid (crossquad) - ideal surrounding Instructions in: “Electrical parameters CMOS07” manual (ds13291.pdf) A1 A2 B1 B2 Exemplary calculation – choose W/L=7  W/L= 35u/5u quite small MOS

10 Matching Error in VT0 Error in β Statistical errors –
- count under square root For good matching (small current difference) - larger MOS  high WL - higher (VGS – VT0)

11 Matching Table is valid for NMOS, PMOS parameters in electrical parameters Carefully: units mV, μm, %

12 Matching

13 Matching Cadence matching tool output file

14 Biasing currents Usually use buffered band-gap reference voltage
1 - External resistor - accurate resistance value, almost temperature independent 2 – Hipo internal resistor - hipo resistance Ω (1600 Ω Ω) - temperature dependence - viz. parameterFile 3 – other CMOS resistor types - not used because of small sheet resistance One chip can combine both types of bias currents

15 Biasing currents Hipo internal resistor bias current advantages
- temperature dependent current can help with stability of some circuits - quite accurate voltage level shifter Current mirror and resistor MATCHING !!!!

16 Cascoded mirror output resistance
express It negligible

17 Good luck !!!

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