Title :
Compact nA/V triode-MOSFET transconductor
Author :
Lima, J. A De ; Serdijn, W.A.
Author_Institution :
Brazil Semicond. Technol. Center, Jaguariuna, Brazil
Abstract :
A simple nA/V CMOS transconductor for low-frequency gm-C filters is presented. To benefit from the lowest gm/ID ratio, input transistors operate in the triode region, with gm adjusted by their (W/L) and VDS, the latter a tuning-voltage replica. Since VDS surmounts the equivalent noise of the replica circuit, excellent control of gm is attained. Simulations support theoretical analysis. A 5Hz bandpass filter was designed, featuring SNR=59.2 dB for THD<1% at 150 mV and 17 nW consumption.
Keywords :
CMOS analogue integrated circuits; MOSFET; active filters; band-pass filters; equivalent circuits; 150 mV; 17 nW; 2.46 to 13.2 Hz; bandpass filter; equivalent noise; low-frequency gm-C filters; nA/V CMOS transconductor; replica circuit; triode-MOSFET transconductor; triode-region; tuning-voltage replica;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20052551
