Fully‐differential second‐order tunable bandstop filter based on source follower

2019 ◽  
Vol 55 (3) ◽  
pp. 122-124 ◽  
Author(s):  
F.T. Almutairi ◽  
A.I. Karsilayan
2014 ◽  
Vol 7 (6) ◽  
pp. 691-698 ◽  
Author(s):  
Juseop Lee ◽  
Byungguk Kim ◽  
Kangho Lee ◽  
William J. Chappell

In this paper, we show a second-order (four-resonator) absorptive bandstop filter circuit topology which gives a larger bandwidth compared to a first-order topology. Due to the absorptive characteristic, it creates a large attenuation at the center frequency using low-Q resonators. Since low-Q resonators can be used in generating a large attenuation, small-size resonators can be employed in bandstop filter design. Analytic design equations are provided so that a higher-order absorptive bandstop filter can be designed analytically. It is also shown that the second-order filter topology exhibits a better frequency selectivity having a same bandwidth. The proposed filter topology has been applied to a design of a miniaturized low-temperature co-fired ceramic bandstop filter with low-Q resonators. The Q-factor of the lumped-element resonators has been chosen to be 5 for demonstration.


2016 ◽  
Vol 26 (8) ◽  
pp. 571-573 ◽  
Author(s):  
Amir Ebrahimi ◽  
Withawat Withayachumnankul ◽  
Said F. Al-Sarawi ◽  
Derek Abbott

2021 ◽  
Vol 10 (4) ◽  
pp. 1952-1959
Author(s):  
Ali Kareem Nahar ◽  
Hussain K. Khleaf

This paper introduces a multi-bit data converters (MDC) modulator of the 2nd order delta-sigma analog-to-digital converter use the passive adder proposed. The noise shaping quantizer can provide feedback that has generated quantization noise and perform additional shaping noise first-order by coupling noise method.Thus, two Integrator's with ring amplifier and the MDC is shaped by noise coupling quantizer know the 2nd-order noise coupled with somewhat of a DAC modulator. At a summing point, the inputs are summed and then filtered with a low pass filter. A cyclic second order response is generated with a data weighted averaging (DWA) technique in which the DACs ' outputs are limited to one of two states in the noise shaping responses. Mainly as a result of the harmonic distortion in circuits of amplifier. Transistor rate is equipped for the fully differential switched condenser integrator used, a comparator and DWA. The modulator with proposed DWA design, almost quarterly improved timing margin. A simulated SNDR of 92dB is obtained at 20 MHz sampling frequency; while a sinusoidal output of 4.112 dBFS is tested at 90µs besides 20 MHz as the bandwidth. The power consumption is 0.33 mW while the voltage of the supply is 1.2V.


2018 ◽  
Vol 12 (6) ◽  
pp. 689-695
Author(s):  
Marcello De Matteis ◽  
Luca Mangiagalli ◽  
Andrea Baschirotto

2011 ◽  
Vol 72 (1) ◽  
pp. 155-161 ◽  
Author(s):  
Daeyun Kim ◽  
Sunghyun Park ◽  
Minkyu Song

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