1Microelectronics GroupDep. of Innovation Engineering-University of Lecce

A 600mV 3.6mW 68dB DR 4th Order Analog

Base Band Filter for WLAN Receivers

Marcello De Matteis, Stefano D’Amico, Giuseppe Vergallo, Andrea BaschirottoEngineering Innovation Department of University of Lecce

marcello.dematteis@unile.it, stefano.damico@unile.it, giuseppe.vergallo@libero.it, andrea.baschirotto@unile.it

2Microelectronics GroupDep. of Innovation Engineering-University of Lecce

Abstract

4th order base band filter for WLAN receivers

Butterworth Low Pass Filter

Active Gm-RC

VDD=600mV

0.13µm CMOS technology@Vth = 300mV

3Microelectronics GroupDep. of Innovation Engineering-University of Lecce

WLAN Specifications

4th order base band filter for WLAN receivers

Complete DesignLayout

Specifications: order 4th Butterworth

G 0 dB

SNR > 60dB

MHz122 o

4Microelectronics GroupDep. of Innovation Engineering-University of Lecce

Butterworth Low Pass Filter

Two Biquadratic Cells

Cell 1 Cell 2

ωo 2π∙12MHz 2π∙12 MHz

Q 1.3066 0.5412

G 0 dB 0 dB

Active Gm-RC

fUGBW,opamp ≈ fcut-off

out-

out+

R1

C1

R

in+

R2

R1

C1

in-

2

5Microelectronics GroupDep. of Innovation Engineering-University of Lecce

VDD=600mVVDD=600mV0.13µm CMOS technology@Vth = 300mV

21

21

2 RR

RRI

VV B

DDinDC

6Microelectronics GroupDep. of Innovation Engineering-University of Lecce

VDD=600mVVDD=600mV0.13µm CMOS technology@Vth = 300mV

Input CMFBNoiseNo-IdealitiesStability

7Microelectronics GroupDep. of Innovation Engineering-University of Lecce

Conclusion - Simulation ResultsLinearity / Noise DR=68dB@THD=-40dBc (vout=800mVpp,differential)

Total Power Consumption = 3.6 mW

8Microelectronics GroupDep. of Innovation Engineering-University of Lecce

Conclusion

Poster