Title :
Fully differential current-mode third-order Butterworth VHF Gm-C filter in 0.18 μlm CMOS
Author :
Hwang, Y.-S. ; Chen, J.-J. ; Lai, J.-H. ; Sheu, P.-W.
Author_Institution :
Dept. of Electron. Eng., Nat. Taipei Univ. of Technol., Taiwan
Abstract :
The authors present a new fully differential current-mode third-order Butterworth very high frequency Gm-C filter using current-mode linear transformation (CMLT) techniques. The systematic design method and procedure are developed to realise CMLT Gm-C filters efficiently. A third-order Butterworth lowpass filter with 200 MHz cutoff frequency, embedded bandgap reference and bias circuit is implemented in a TSMC 0.18 mum 1P6M process. The total harmonic distortion of the proposed current-mode filter is -46.5 dB at 200 MHz with input signal 0.4 mA. Power dissipation is 16.77 mW under 1.8 V supply voltage. Its core area occupies 0.163times0.186 mm2 . Both post-layout simulation and experimental results confirm the theoretical analysis. The proposed circuits can be extended to high-order Chebychev and elliptic filters
Keywords :
Butterworth filters; CMOS integrated circuits; current-mode circuits; low-pass filters; 0.18 micron; 200 MHz; Fully differential current-mode third-order Butterworth VHF Gm-C filter; TSMC 1P6M process; bias circuit; current-mode linear transformation; elliptic filters; embedded bandgap reference; high-order Chebychev filters; power dissipation; third-order Butterworth lowpass filter; total harmonic distortion; very high frequency Gm-C filter;
Journal_Title :
Circuits, Devices and Systems, IEE Proceedings -
