| Title |
Design of Low Voltage Transconductor for Fully Differential Gm-C Filter |
| Authors |
최석우(Choi, Seok-Woo) ; 김선홍(Kim, Sun-Hong) ; 윤창훈(Yun, Chang-Hun) |
| Keywords |
Gm-C filter ; Composite transistor ; Transconductor ; SFG ; Elliptic |
| Abstract |
A fully differential transconductor using the series composite transistor is proposed. Simulation results show that THD is less than 1.2% for the differential input signal of up to 1.5V_{p-p} when the input signal frequency is 10MHz. i he proposed transconductor is used to design a third-order elliptic Gm-C lowpass filter with 138kHz cutoff frequency for ADSL Tx filter. The design procedure is based on signal flow graph(SFG) of a doubly-terminated LC ladder filter by means of fully differential transconductors and capacitors. The filter is fabricated and measured with a 0.35μm CMOS process. |