Title :
Compact integrated transconductance amplifier circuit for temporal differentiation
Author :
Stocker, Alan A.
Author_Institution :
Inst. of Neuroinformatics, Zurich Univ., Switzerland
Abstract :
A compact integrated CMOS circuit for temporal differentiation is presented. It consists of a high-gain inverting amplifier, an active non-linear transconductance and a capacitor and requires only 4 transistors in its minimal configuration. The circuit provides two rectified current outputs that are proportional to the temporal derivative of the input voltage signal. Besides the compactness of its design, the presented circuit is not dependent on the DC-value of the input signal, as compared with known integrated differentiator circuits. Measured chip results show that the circuit operates on a large input frequency range for which it provides near-ideal temporal differentiation. The circuit is particularly suited for focal-plane implementations of gradient-based visual motion systems.
Keywords :
CMOS analogue integrated circuits; differentiation; feedback amplifiers; CMOS integrated circuit; active nonlinear transconductance; capacitor; focal plane; gradient-based visual motion system; high-gain inverting amplifier; temporal differentiation; transconductance amplifier; CMOS technology; Capacitors; Circuits; Current measurement; Frequency measurement; Motion estimation; Signal design; Signal processing algorithms; Transconductance; Voltage;
Conference_Titel :
Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on
Print_ISBN :
0-7803-7761-3
DOI :
10.1109/ISCAS.2003.1205535
