Title :
A 2.5 V active lowpass filter using all-npn gain cells with a 1 V/sub pp/ linear input range
Author :
Arai, T. ; Koyama, M. ; Tanimoto, H. ; Yoshida, Y.
Author_Institution :
Toshiba Corp., Kawasaki, Japan
Abstract :
Describes an all-npn gain cell with a highly linear V-I converter, which has a 1-V/sub pp/ linear input range and is suitable for operation at 2 V. An active LPF is used to test the transconductor. The LPF is derived from a doubly-terminated third-order Butterworth LC ladder filter prototype with 192-kHz nominal cutoff. Measured total harmonic distortion (THD) of the LPC as a function of the input voltage is shown. The maximum linear input range of 1 V/sub pp/ is achieved when the supply voltage is 2.5 V and THD is -53 dB at 10 kHz. Equi-THD curves of the LPF with the input range and the supply voltage taken as parameters are also shown.<>
Keywords :
active filters; electric distortion; low-pass filters; 10 kHz; 192 kHz; 2.5 V; V-I converter; active lowpass filter; all-npn gain cells; doubly-terminated third-order Butterworth LC ladder filter prototype; input voltage; linear input range; supply voltage; total harmonic distortion; transconductor; Active filters; Capacitors; Circuits; Dynamic range; Lithium; Nonlinear filters; Prototypes; Transconductance; Transconductors; Voltage;
Conference_Titel :
Solid-State Circuits Conference, 1993. Digest of Technical Papers. 40th ISSCC., 1993 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0987-1
DOI :
10.1109/ISSCC.1993.280062
