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A novel multi-output current amplifier exhibiting independent electronically controllable gains is proposed. The new device provides a cost-efficient and low-power solution to filter designs. While multi-output devices are often employed to reduce active components within the filters, the proposed device conserves the independent tuning characteristics. Current-mode two-integrator-loop filter topologies are considered as the demonstrating examples. The experimental results obtained from a 0.18 μm complementary metal oxide semiconductor (CMOS) process are provided. [ABSTRACT FROM AUTHOR]

Design of a CMOS 18th-order IF (intermediate frequency) bandpass filter for integrated low-IF Bluetooth receivers is presented. The centre frequency and bandwidth of the filter are 3 and 1 MHz, respectively. The proposed filter is based on unity gain fully differential voltage buffers and provides efficient, low power and a small area design solution. The filter, including its automatic tuning circuit, occupies an area of 0.6 mm2 in a standard 0.5 µm-CMOS chip. Experimental results show that the filter satisfies the selectivity and dynamic range requirements of Bluetooth while operating from a total supply current of 0.9 mA. [ABSTRACT FROM AUTHOR]

Design of a CMOS robust low-distortion fully differential second- generation current conveyor (CCII) is presented. The proposed circuit is essential to extend the use of the CCII-based circuits to high- performance VLSI applications. The design avoids using current mirror(s) in the signal - in order to minimise the distortion caused by mismatched mirroring transistors. The proposed circuit is implemented in a standard 0.5 μm CMOS technology and its different characteristics are measured. Statistical measurement results show that the proposed fully differential CCII exhibits total harmonic distortion (THD) of -78.9dB associated with less than 0.1 dB variation. [ABSTRACT FROM AUTHOR]