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A 2.3V CMOS 80-200MHz 4th-order continuous-time 0.05° equiripple linear phase filter with an automatic frequency tuning system is presented. An Operational Transconductance Amplifier (OTA) based on transistors operating in triode region is used to achieve a very wide linear input range and a wide transconductance tuning range. A system that integrates common-mode feedback (CMFB), common-mode feedforward...
A low-voltage 4th order RF bandpass filter structure based on a two magnetically-coupled resonators prototype is presented. Each resonator is built using on-chip spiral inductors and accumulation-mode PMOS capacitors to provide center frequency tuning. The proposed architecture is using electric coupling to emulate the effect of the transformer thus providing bandwidth tuning with small passband ripple...
A fully balanced CMOS Variable Gain Amplifier (VGA) for high frequency applications and large signals is presented. The VGA consists of an analog multiplier, current gain stages, and resistive loads. A frequency compensation scheme based on a capacitive feed-forward technique increases the bandwidth by more than 60 %. Common-Mode Feed-Forward (CMFF) techniques are used to minimize dc offsets. The...
A pseudo differential fully balanced CMOS OTA architecture with inherent common mode detection is proposed. Through judicious arrangement, the common-mode feedback circuit can be economically implemented. The OTA achieves a good CMRR and is suitable for low voltage operation. As an example of the applications of the proposed OTA, a 100MHz 4th order linear phase OTA-C filter is presented. The measured...
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