scholarly journals OTA Based 2nd Order Butterworth Filter For Mobile Communication using CMOS Technology

2021 ◽  
Author(s):  
M Bharathi ◽  
K Akshitha ◽  
MG Divyashree ◽  
BR Nagakrupa ◽  
JK Sindhu
Keyword(s):  
Mobile Communication ◽  
Cmos Technology ◽  
Butterworth Filter ◽  
Order Butterworth Filter

scholarly journals Current Controlled Differential Difference Current Conveyor Transconductance Amplifier and Its Application as Wave Active Filter

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Neeta Pandey ◽  
Praveen Kumar ◽  
Jaya Choudhary
Keyword(s):  
Signal Processing ◽  
Cutoff Frequency ◽  
Cmos Technology ◽  
Bias Current ◽  
Active Filter ◽  
Current Conveyor ◽  
Third Order ◽  
Transconductance Amplifier ◽  
Wave Filter ◽  
Order Butterworth Filter

This paper proposes current controlled differential difference current conveyor transconductance amplifier (CCDDCCTA), a new active building block for analog signal processing. The functionality of the proposed block is verified via SPICE simulations using 0.25 μm TSMC CMOS technology parameters. The usefulness of the proposed element is demonstrated through an application, namely, wave filter. The CCDDCCTA-based wave equivalents are developed which use grounded capacitors and do not employ any resistors. The flexibility of terminal characteristics is utilized to suggest an alternate wave equivalents realization scheme which results in compact realization of wave filter. The feasibility of CCDDCCTA-based wave active filter is confirmed through simulation of a third-order Butterworth filter. The filter cutoff frequency can be tuned electronically via bias current.

scholarly journals A CMOS Transmitter Analog Baseband for 5G Mobile Communication

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1319
Author(s):  
Yen ◽  
Chen ◽  
Wei ◽  
Chung
Keyword(s):  
Mobile Communication ◽  
Gain Control ◽  
Cmos Technology ◽  
Control Technique ◽  
Constant Current ◽  
Constant Current Density ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Analog Baseband ◽  
5G Mobile Communication

CMOS analog baseband circuits including a low-pass filter (LPF) and a programmable gain amplifier (PGA) are designed and implemented for the fifth-generation (5G) mobile communication. The super source follower topology is adopted to achieve a wideband LPF with good linearity, while the constant current density gain control technique is used to implement gain cells of the PGA. The circuits are integrated as an analog baseband for a 5G transmitter (TX) and fabricated using TSMC 90-nm CMOS technology. The analog baseband exhibits the bandwidth from 1.03 to 1.05 GHz when the voltage gain is varied from −18.9 dB to 3.8 dB in 1-dB steps. The gain step errors are within −0.7 dB to 0.9 dB. In the highest gain mode, the analog baseband achieves the IP1dB of −10 dBv and the IIP3 of −0.2 dBv. Over the band of interest, the NF of the analog baseband is 24.4–40.0 dB.

MONITORING THE AFR OF THE INFORMATION SIGNAL FILTER OF A FLUX-GATE MAGNETOMETER ON THE EXAMPLE OF A SINGLE LINK BUTTERWORTH FILTER

2019 ◽  
pp. 40-49
Author(s):  
Yu. N. Tsybin
Keyword(s):  
Input Signal ◽  
Control Method ◽  
Second Harmonic ◽  
Control Analysis ◽  
Signal Source ◽  
Monitoring Method ◽  
Butterworth Filter ◽  
Fluxgate Sensor ◽  
Information Signal ◽  
Order Butterworth Filter

The content of this paper relates to the field of monitoring the parameters of a magnetic field (MF) meter with a MF a fluxgate sensor. The article directly discusses the control method for the amplitude frequency response (AFR) of the second harmonic filter of an EMF fluxgate meter. The purpose of the work is to minimize the workplace (WP) equipment for magnetometer monitoring. We suggest an AFR monitoring method based on three readings. As an input signal source, while monitoring an AFR filter, we suggest the use of a WP fluxgate meter. The fluxgate meter is installed in a magnetic screen. The method consists in generating the filter input signal using the magnetometer. The essence of the suggested method is to analyze the AFR symmetry. As the base filter, we use a second-order Butterworth filter with a narrowband symmetric AFR. The effect of the electrical element filter ratings is systematized in the form of a correspondence table: an electric element – an AFR parameter. We present the AFR sufficiency control analysis in terms of its symmetry. The AFR monitoring, in terms of its symmetry, has been supplemented with the Kр(f0) monitoring using the personal computer. We demonstrate the peculiarities of using a fluxgate meter as an input signal source. We derived the ratio of the magnetometer electronic part parameters that affect the accuracy (discreteness) of the filter’s input signal generation. We present an algorithm with a description of the magnetometer operation in the AFR monitoring mode.

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