DocumentCode :
781199
Title :
A 1.2-V n-p-n-only integrator for log-domain filtering
Author :
El-Gamal, Mourad N. ; Roberts, Gordon W.
Author_Institution :
Microelectron. & Comput. Syst. Lab., McGill Univ., Montreal, Que., Canada
Volume :
49
Issue :
4
fYear :
2002
fDate :
4/1/2002 12:00:00 AM
Firstpage :
257
Lastpage :
265
Abstract :
A simple log-domain integrator that operates nominally with a supply voltage of 1.2 V is proposed. It does not employ p-n-p or positive metal-oxide-semiconductor (PMOS) transistors in the signal path. This has two advantages: (1) It makes the integrator suitable for high-frequency applications. (2) The circuit can be implemented using low-cost bipolar processes rather than the more expensive bipolar complementary metal-oxide-semiconductor (BiCMOS) processes or the bipolar processes featuring high-quality p-n-p transistors. A third-order Chebyshev prototype filter, employing the proposed integrator, is realized using a semicustom bipolar array. It consumes 282 μA per pole for a cutoff frequency of 1.5 MHz, achieving a 40.5 dB dynamic range. For lower biasing currents, the circuit can operate from a supply voltage as low as 0.9 V. Detailed experimental results are reported and discussed
Keywords :
Chebyshev filters; bipolar analogue integrated circuits; continuous time filters; current-mode circuits; frequency response; integrating circuits; low-power electronics; nonlinear filters; 0.9 to 1.2 V; 1.5 MHz; 282 muA; HF applications; analog integrated circuits; companding; continuous-time filters; current-mode circuits; high-frequency applications; log-domain filtering; log-domain integrator; low power circuits; low voltage operation; low-cost bipolar processes; n-p-n only integrator; nonlinear circuits; semicustom bipolar array; semicustom bipolar process; third-order Chebyshev prototype filter; tunable filters; BiCMOS integrated circuits; Bipolar transistor circuits; Cutoff frequency; Dynamic range; Filtering; Filters; Low voltage; Prototypes; Signal processing; VHF circuits;
fLanguage :
English
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
1057-7130
Type :
jour
DOI :
10.1109/TCSII.2002.801207
Filename :
1017782
Link To Document :
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