Title :
30-100-MHz NPN-only variable-gain class-AB instantaneous companding filters for 1.2-V applications
Author :
El-Gamal, Mourad N. ; Baki, Rola A. ; Bar-Dor, Amir
Author_Institution :
Dept. of Electr. & Comput. Eng., McGill Univ., Montreal, Que., Canada
Abstract :
Two variations of a continuous-time instantaneous companding filter were integrated in a 25 GHz bipolar process. Their -3-dB frequencies are tunable in the ranges of 1-30 and 30-100 MHz. The DC gains are controllable up to 10 dB. The measured dynamic ranges for a 1% total harmonic distortion are 62.5 and 50 dB, for the 30 and 100 MHz filters, respectively. At maximum cutoff frequencies, the filters dissipate 6.5 mW from a 1.2 V supply.
Keywords :
VHF filters; bipolar analogue integrated circuits; circuit tuning; continuous time filters; current-mode circuits; integrating circuits; low-power electronics; programmable filters; 1.2 V; 10 dB; 25 GHz; 30 to 100 MHz; 6.5 mW; NPN-only implementation; active filters; bipolar process; class-AB type; continuous-time filters; differential integrator; instantaneous companding filters; log domain filtering; log domain integrator; tunable filters; variable-gain filters; BiCMOS integrated circuits; Circuit testing; Cutoff frequency; Distortion measurement; Integrated circuit measurements; Power harmonic filters; Signal processing; Tunable circuits and devices; VHF circuits; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
