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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...
A low noise, 250-MHz fifth order 0.1 dB ripple Chebyshev gm-C filter, with a novel discrete tuning scheme is presented. The discrete tuning circuit switches ON/OFF small gm cells which are connected in parallel to the main gm cell, based on the PVT conditions, to correct for the shift in the cutoff frequency fc. Compared to conventional tuning schemes, proposed discrete scheme demonstrates improved...
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...
This paper presents an Active-RC low-pass filter for WiMedia UWB RF transceiver. Butterworth type is used for meeting the attenuation at stop band and insertion loss for pass band of WiMedia UWB system. 3 bits tuning block is used for matching needed bandwidth and Q factor. The cutoff bandwidth is 290 MHz and current consumption is about 9.7 mA for QPSK modulation. It shows good operation in the RF...
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