Design of Low-Loss and Highly-Selective Cmos Active Bandpass Filter at K-Band

Abstract

Abstract-In this paper, a second-order Chebyshev active bandpass filter (BPF) with three finite transmission zeros is presented. The filter utilizes a tapped-inductor feedback technique to compensate resistive losses of on-chip inductors, and a shunt-feedback inductor between input and output ports to achieve the transmission zeros. Moreover, one transmission zero is in the lower stopband, and two transmission zeros are in the upper stopband, thus improving the selectivity of the filter significantly. The filter is designed and fabricated in a standard 0.18-µm CMOS technology with a chip area of 0.57 mm × 0.65 mm including all testing pads. The circuit draws 6 mA from a 0.7-V supply voltage. Additionally, the filter achieves a 1.65-dB insertion loss and 13.2-dB return loss with a 17% 3-dB bandwidth at 23.5 GHz. The measured NF and input P 1 dB is 6.7 dB and −3.5 dBm. The rejection levels at the transmission zeros are greater than 15.2 dB. Finally, the large-signal characterizations are also investigated by the 1-dB compression point (P 1 dB ) of the filter.

E-Band Active Q-Enhanced Pseudo-combline Resonator in 130 nm SiGe BiCMOS

“…One possible remedy is the adoption of active Q-enhancement of passive resonators on-chip [7][8][9][10][11], at the expense of potentially higher NF and finite dynamic range. A secondary goal would be to minimize the size of the distributed components (thereby saving on chip area) by opting for pseudo-combline resonators [12] as opposed to full quarter-wave (λ g /4) or half-wave (λ g /2) resonators.…”

“…In CMOS, active Q-enhancement has been demonstrated at 34.2 GHz [9] and 25.65 GHz [10] on λ g /2 complementary conducting strip (CCS) transmission line resonators, though in both cases the choice of cross-coupled enhancement circuit rules out the use of more compact λ g /4 resonators. The lumped resonators in [11] were enhanced at 24 GHz using the lumped inductor itself as feedback element in the circuit, which also makes the single-ended input impedance inductive.…”

Chebyshev Bandpass Filter Using Resonator of Tunable Active Capacitor and Inductor

“…The LC based passive bandpass filter has been used for several decades; however, when applied to the nanotechnology CMOS integrated circuit it confronts limitations. For example, the degraded performance of CMOS spiral inductor due to its significant resistive loss reduces BPF quality factor and restrains the gain and bandwidth [1,2]. Inductors are bulky and expensive, significantly increasing the instability of integration and manufacturing cost.…”

“…Reducing resistive loss in the Chebyshev bandpass filter has been presented in improvement on pass band gain, bandwidth, and center frequency [1,2,[5][6][7][8]. The tappedinductor compensates the inductor resistive loss and adds an additional shunt feedback passive inductor to operate in the K-band [2]. The transformer-based passive inductor produces a frequency-dependent negative resistance for resistive loss compensation [8].…”

A Broadband High Linearity Current-Reuse Bulk-Controlled Mixer for 4g Applications

“…Antennas, low noise amplifiers (LNAs), mixers, filters, voltage controlled oscillators (VCOs), and power amplifiers (PAs) are the main radio frequency (RF) circuits of the transceiver design [2][3][4][5][6]. Mixers in receivers are responsible for down converting the incoming RF signals to intermediate frequency (IF) signals.…”