A 1.3-V 5-mW fully integrated tunable bandpass filter at 2.1 GHz in 0.35-/spl mu/m CMOS
A 2.1-GHz 1.3-V 5-mW fully integrated Q-enhancement LC bandpass biquad programmable in f/sub o/, Q, and peak gain is implemented in 0.35-/spl mu/m standard CMOS technology. The filter uses a resonator built with spiral inductors and inversion-mode pMOS capacitors that provide frequency tuning. The Q...
Saved in:
Published in | IEEE journal of solid-state circuits Vol. 38; no. 6; pp. 918 - 928 |
---|---|
Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
IEEE
01.06.2003
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | A 2.1-GHz 1.3-V 5-mW fully integrated Q-enhancement LC bandpass biquad programmable in f/sub o/, Q, and peak gain is implemented in 0.35-/spl mu/m standard CMOS technology. The filter uses a resonator built with spiral inductors and inversion-mode pMOS capacitors that provide frequency tuning. The Q tuning is through an adjustable negative-conductance generator, whereas the peak gain is tuned through an input G/sub m/ stage. Noise and nonlinearity analyses presented demonstrate the design tradeoffs involved. Measured frequency tuning range around 2.1 GHz is 13%. Spiral inductors with Q/sub o/ of 2 at 2.1 GHz limit the spurious-free dynamic range (SFDR) at 31-34 dB within the frequency tuning range. Measurements show that the peak gain can be tuned within a range of around two octaves. The filter sinks 4 mA from a 1.3-V supply providing a Q of 40 at 2.19 GHz with a 1-dB compression point dynamic range of 35 dB. The circuit operates with supply voltages ranging from 1.2 to 3 V. The silicon area is 0.1 mm/sup 2/. |
---|---|
ISSN: | 0018-9200 1558-173X |
DOI: | 10.1109/JSSC.2003.811867 |