New differential difference stage and its application to band-pass filter at 10.7 MHz with high quality factor

This paper describes the design of a novel cascode-grounded tunable active inductor and its application in an active band-pass filter (BPF) suitable for multi-band radio frequency (RF) front-end circuits. The proposed active inductor circuit uses feedback resistance to improve the equivalent inductance and the quality factor. The novelty of this work lies on the use of a few number of multi-finger transistors, which allows reducing strongly the power consumption and the silicon area. In other words, we demonstrate that the use of variable P-type Metal-Oxide-Semiconductor (PMOS) resistor and controllable current source have a good potential for wide tuning in terms of inductance value, quality factor and frequency operation. The RF BPF is realized using the proposed active inductor with suitable input and output buffer stages. The tuning of the center frequency for multi-band operation is achieved through control voltages. The designed active inductor and RF BPF have been implemented in a standard 0.13[Formula: see text][Formula: see text]m Complementary Metal Oxide Semiconductor (CMOS) technology. The simulation results are compared between schematic and post-layout design for inductance value, quality factor, transmission coefficient S21 and noise. This design yields encouraging results: the inductance value can be tuned from 10.94 to 44.17[Formula: see text]nH with an optimal quality factor around 2,581. In addition, the center frequency of the BPF can be tuned between 2 and 4.84[Formula: see text]GHz with an average insertion loss of [Formula: see text][Formula: see text]dB. Throughout this range, the noise figure is between 10.49 and 9.22[Formula: see text]dB with an input referred 1[Formula: see text]dB compression point of [Formula: see text][Formula: see text]dBm and IIP3 of 7.36[Formula: see text]dBm. The filter occupies 25.43[Formula: see text][Formula: see text]m of active area without pads and consumes between 2.38 and 2.84[Formula: see text]mW from a 1[Formula: see text]V supplying voltage.

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High-quality factor asymmetric-slope band-pass filters: a fractional-order capacitor approach

IET Circuits Devices & Systems ◽

10.1049/iet-cds.2011.0239 ◽

2012 ◽

Vol 6 (3) ◽

pp. 187 ◽

Cited By ~ 67

Author(s):

P. Ahmadi ◽

B. Maundy ◽

A.S. Elwakil ◽

L. Belostotski

Keyword(s):

Quality Factor ◽

Fractional Order ◽

High Quality Factor ◽

High Quality ◽

Band Pass

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Design and Synthesis of Multi-Mode Bandpass Filter for Wireless Applications

Electronics ◽

10.3390/electronics10222853 ◽

2021 ◽

Vol 10 (22) ◽

pp. 2853

Author(s):

Satheeshkumar Palanisamy ◽

Balakumaran Thangaraju ◽

Osamah Ibrahim Khalaf ◽

Youseef Alotaibi ◽

Saleh Alghamdi

Keyword(s):

Quality Factor ◽

Bandpass Filter ◽

Center Frequency ◽

Impedance Bandwidth ◽

Band Pass Filter ◽

Pass Filter ◽

Coaxial Cavity ◽

Wireless Applications ◽

Design And Synthesis ◽

Band Pass

In this paper, a compact bandpass filter with improved band stop and band pass characteristics for wireless applications is built with four internal conductive poles in a single resonating cavity, which adds novel quad-resonating modes to the realization of band pass filter. This paper covers the design and testing of the S-band combline coaxial cavity filter which is beneficial in efficient filtering functions in wireless communication system design. The metallic cavity high Q coaxial resonators have the advantages of narrowband, low loss, better selectivity and high potential for power handling, as compared to microstrip filter in the application to determine the quality factor of motor oils. Furthermore, the tuning of coupling screws in the combline filter allows in frequency and bandwidth adjustments. An impedance bandwidth of 500 MHz (fractional bandwidth of 12.8%) has been achieved with an insertion loss of less than 2.5 dB and return loss of 18 dB at the resonant frequency. Four-pole resonating cavity filters have been developed with the center frequency of 4.5 GHz. Insert loss at 0 dB and estimated bandwidth at 850 MHz and a quality factor of 4.3 for the band pass frequencies between 4 and 8 GHz is seen in the simulated result.

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A NEW SWITCHED OPAMP APPROACH FOR IMPROVING THE OPERATION OF AUTO-RESET SWITCHED-CAPACITOR FILTERS

Journal of Circuits System and Computers ◽

10.1142/s0218126611007633 ◽

2011 ◽

Vol 20 (05) ◽

pp. 835-848 ◽

Cited By ~ 1

Author(s):

MOHAMMAD RASHTIAN ◽

OMID HASHEMIPOUR ◽

KEIVAN NAVI ◽

ALI JALALI

Keyword(s):

Power Consumption ◽

Quality Factor ◽

Second Order ◽

Considerable Reduction ◽

Center Frequency ◽

Switched Capacitor ◽

Band Pass Filter ◽

Pass Filter ◽

Band Pass ◽

Switched Capacitor Filters

In this paper, a new switched opamp is presented in order to improve the operation of auto-zeroed switched capacitor circuit. This approach results in a considerable reduction in power consumption and a moderate speed improvement. Based on the above improvement, a second-order band-pass filter with a center frequency of 833 kHz and quality factor of 8 is realized and compared with previous works. The proposed switched opamp is also utilized in the structure of a novel z to -z2 block for the design of pseudo two-path band-pass filters. A second-order pseudo two-path band-pass filter with the same specification of the previous work is designed, simulated, and compared.

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