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A 4th order Chebyshev complex filter with stop band zeros at the DC point for low-IF receivers' applications using 0.18μm CMOS technology is proposed in this paper. Based on capacitor-OTA integrators, the designed ladder filter uses resistors instead of capacitors to realize the transmission zeros. The complex filter has a 0 to 48dB tunable gain (6dB per step) and over 65dB DC-offset rejection. A...
The design of a low-cutoff-frequency Gm-C low-pass filter is presented, the key part in the filter, the operational transconductance amplifier utilize a folded-cascode structure. As the circuit is desired to operate at low frequency, it is necessary to design a small linear trans-conductance amplifier employing a cross-coupled input stage. To compensate the gain loss, the auxiliary amplifiers are...
Generation of filters using operational transconductance amplifiers and capacitors (OTA-C) has become more and more popular. A simple yet effective method of analytical synthesis is presented that makes use of ladder circuits, which are much more widely understood. Given the ladder circuit of a filter of any order, an equivalent OTA-C filter can be easily synthesized. The synthesis process is shown...
This paper presents design procedure of the low-frequency integrated low-pass filter suitable for integrated circuit fabrication. Design methodology is concentrated on the lowest power dissipation while retaining all other electrical specifications. It can be concluded that this filter should be a 5th order elliptic filter using signal flow graph method and it is easy to optimize dynamic range of...
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