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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...
Based on TSMC 0.18μm 1P6M RF CMOS process, a 4th-order Butterworth analog low-pass filter (LPF) used in the transmitting link of 2.4GHz Wireless Sensor Network (WSN) radio frequency (RF) front-end is designed in this paper. In this design, active-gm-RC structure is derived, and it can achieve the same low consumption performance as the gm-C structure while have better linearity than that of the gm...
Presented is a novel source-follower-based (SFB) bi-quad cell suitable for realizing continuous-time zero-pole type filters. Unlike the conventional SFB bi-quad cells that can only realize complex poles, additional complex zeros can be synthesized in the proposed one, by adding two feedforward capacitors. A 4th-order Chebyshev II fully differential low-pass filter prototype was fabricated in a 0.18-μm...
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...
Recent years have seen an increasing number of application specific integrated circuits (ASICs) designated for various biomedical applications. In this paper we presented a CMOS reconfigurable analogue ASIC working on the discrete-time mode for low power biomedical signal filtering. The ASIC we have developed incorporates a switched-capacitor based analogue module, a current source, a voltage source,...
A 3rd order complex band-pass filter (BPF) with auto-tuning architecture is proposed in this paper. It is implemented in 0.18 ??m standard CMOS technology. The complex filter is centered at 4.092 MHz with bandwidth of 2.4 MHz. The in-band 3rd order harmonic input intercept point (IIP3) is larger than 16.2 dBm, with 50 ?? as the source impedance. The input referred noise is about 80 uVrms. The RC tuning...
A 3rd order complex band-pass filter (BPF) with auto-tuning architecture is proposed in this paper. It is implemented in 0.18 ??m standard CMOS technology. The complex filter is centered at 4.092 MHz with bandwidth of 2.4 MHz. The in-band 3rd order harmonic input intercept point (IIP3) is larger than 19 dBm, with 50 ?? as the source impedance. The input referred noise is about 80 ??Vrms. The RC tuning...
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