A CMOS voltage-mode divider, which can operate for low supply voltage and low power dissipation, is presented in this paper. The proposed voltage-mode divider can be used to realize a pseudo-exponential function generator. The experimental results of the proposed voltage-mode divider show that, under the supply voltage VDD=2.5 V, the linearity error is less than 1.18% and the power consumption is only 102 µW. Also the proposed pseudo-exponential function generator exhibits a 15 dB output dynamic range and the linear error is less than1.54%. Both the proposed circuits have been fabricated in a 0.5 µm N-well CMOS 2P2M process. The proposed circuits are expected to be useful in analog signal processing applications.

A compact, low voltage, low power and wide output operating range CMOS exponential-control variable-gain amplifier has been presented. The gain control range of the proposed variable-gain amplifier can be about 50.7 dB while the maximum linearity error is about -1.09%. For the case of supply voltage VDD = 2 V, the maximum power dissipation is only 1.6 µW. The proposed circuit has been fabricated in a 0.5 µm 2p2m N-well CMOS process. Experimental results are given to confirm the feasibility of the proposed variable gain amplifier. The proposed circuit is expected to be useful in analog signal processing applications.

A CMOS voltage-to-current converter in weak inversion is presented in this Letter. It can operate for low supply voltage and its power consumption is also low. As the input voltage varies from -0.15 V to 0.15 V, the measured maximum linearity error for the proposed voltage-to-current converter, is about 3.35%. Its power consumption is only 26 µW under the supply voltage of 2 V. The proposed voltage-to-current converter has been fabricated in a 0.5 µm N-well CMOS 2P2M process. The proposed circuit is expected to be useful in analog signal processing applications.

A new CMOS 1/x circuit is presented in this letter. The output amplitude of the proposed circuit can be adjusted by a bias current. The proposed circuit can be used to realize a current-to-voltage converter and a current-mode divider. The proposed circuits have been fabricated in a 0.5 µm CMOS process. Experimental results show that under the linear error less than 1%, the input range of the proposed 1/x circuit can be up to 1.5 V for the supply voltages of 1.5 V and the power dissipation is 0.24 mW. The experimental results are given to demonstrate the proposed circuits.