Logic style

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# Logic style - PowerPoint PPT Presentation

AID–EMC: Low emission Digital Circuit Design. Logic style. Standard CMOS logic Pseudo NMOS logic MCML (MOS Current Mode Logic--differential version of CSL) CSL (CMOS Current Steering Logic). Why CSL ?. Target : Mixed-Mode Automotive Electronics Design

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Presentation Transcript

AID–EMC: Low emission Digital Circuit Design

### Logic style

Standard CMOS logic

Pseudo NMOS logic

MCML (MOS Current Mode Logic--differential version of CSL)

CSL (CMOS Current Steering Logic)

Why CSL ?

Target : Mixed-Mode Automotive Electronics Design

Key aspect : di/dt + Power + Area + Speed

Current Steering Logic

CSL – Static Characteristic

Vdd=2.5v

I=20uA

Design Parameter:

R=

CSL – Noise Margin

Vdd=2.5v

I=20uA

The Effect of Decoupling Capacitance

Cd

Vdd=3.3v

I=10uA

R=6

1p

10p,100p,1n,10n

There is a Trade off !

Comparison of 16-bit RCA

Note:

Vdd=1.5v

The curve of CSL 16-bit RCA was obtained

by calculating the real speed F of the circuit,

given the different supply current I.

CMOS

Power vs. Frequency (16-bit RCA)

CSL

9.00E-04

8.00E-04

7.00E-04

• Solution:
• power consumption management
• power down strategies,
• sleeping transistors,

6.00E-04

Power(Watt)

5.00E-04

4.00E-04

3.00E-04

2.00E-04

1.00E-04

0.00E+00

0

50

100

150

200

250

300

Frequency(Mhz)

Spectrum Analysis of di/dt

Power Spectral Analysis of the CMOS 16-bit RCA

150

140

30db decrease

130

120

110

Power

100

90

GABARIT ?

80

70

5

6

7

8

9

10

10

10

10

10

10

10

Frequency (Hz)