A Low-Voltage Low-Power Rail-to-Rail Constant g_m Transconductance Amplifier

Authors:
Ahmed M. Eltawil;Ahmed M. Soliman
Affiliations:
Department of Electronics and Communication Engineering, Cairo University, Egypt;Department of Electronics and Communication Engineering, Cairo University, Egypt
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2000

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Abstract

In this paper, a low-voltage low-power rail-to-rail constant g_{\it{m}} transconductance amplifier (TA) is introduced. The supply voltages are set at (±1.5 V). The circuit depends on selecting the maximum transconductance (g_{\it{m}}) to achieve an almost constant g_{\it{m}} over the entire common-mode (CM) range. The circuit is then used to realize a second-order 4 MHz lowpass filter consuming 530 μW, and a fifth-order 450 kHz lowpass elliptic filter consuming 2.3 mW. Both filters can be integrated on silicon without any external connections.