Comb-Based Decimation Filter with Improved Aliasing Rejection in All Folding Bands

2021 ◽  
pp. 615-623
Author(s):  
Gordana Jovanovic Dolecek ◽  
Isak Karabegovic
Keyword(s):  
Decimation Filter

scholarly journals A Sigma-Delta ADC for Signal Conditioning IC of Automotive Piezo-Resistive Pressure Sensors with over 80 dB SNR

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4199 ◽  
Author(s):  
Behnam Samadpoor Rikan ◽  
Sang-Yun Kim ◽  
Nabeel Ahmad ◽  
Hamed Abbasizadeh ◽  
Muhammad Riaz Ur Rehman ◽  
...  
Keyword(s):  
Input Signal ◽  
Flicker Noise ◽  
Signal To Noise Ratio ◽  
Pressure Sensors ◽  
High Gain ◽  
Cmos Process ◽  
Signal Conditioning ◽  
Sigma Delta ◽  
Cic Filter ◽  
Decimation Filter

This paper presents a second-order discrete-time Sigma-Delta (SD) Analog-to-Digital Converter (ADC) with over 80 dB Signal to Noise Ratio (SNR), which is applied in a signal conditioning IC for automotive piezo-resistive pressure sensors. To reduce the flicker noise of the structure, choppers are used in every stage of the high gain amplifiers. Besides, to reduce the required area and power, only the CIC filter structure is adopted as a decimation filter. This filter has a configurable structure that can be applied to different data rates and input signal bandwidths. The proposed ADC was fabricated and measured in a 0.18-µm CMOS process. Due to the application of only a CIC filter, the total active area of the SD-ADC and reference generator is 0.49 mm2 where the area of the decimation filter is only 0.075 mm2. For the input signal bandwidth of 1.22 kHz, it achieved over 80 dB SNR in a 2.5 MHz sampling frequency while consuming 646 µW power.

scholarly journals Sharpening of the multistage modified comb filters

2011 ◽  
Vol 8 (3) ◽  
pp. 281-291 ◽  
Author(s):  
Marko Nikolic ◽  
Miroslav Lutovac
Keyword(s):  
Comb Filter ◽  
Polyphase Filter ◽  
Filter Structure ◽  
Direct Form ◽  
Comb Filters ◽  
Decimation Filter ◽  
Last Stage ◽  
Positive Integers

This paper describes the application of filter sharpening method to the modified comb filter (MCF) in the case of decimation factor, which is product of two or more positive integers. It is shown that in the case of multistage decimation with MCF, filters in each stage are also MCF. Applying the sharpening to the decimation filter in the last stage provides very good results, with savings in the number of operations comparing to the case of sharpening of the complete filter. Direct-form FIR polyphase filter structure is proposed for the filters in each stage.

scholarly journals Design of multiplierless comb compensators with magnitude response synthesized as sinewave functions

2020 ◽  
Vol 33 (1) ◽  
pp. 1-14
Author(s):  
Gordana Jovanovic-Dolecek
Keyword(s):  
Design Parameters ◽  
Magnitude Response ◽  
Decimation Filter ◽  
Factor Design

This paper presents a research on design of multiplierless comb compensators with magnitude response synthesized as sinewave functions. First, it is elaborated the importance of comb decimation filter and why we need its compensator. In continuation are presented some favorable characteristics of comb compensator. The compensators, with magnitude characteristic synthesized as sinewave functions fulfill those favorable characteristics. Next, are described some most important results on design of compensators with sinewave-based magnitude responses including single and cascaded sinewave-based functions. In all designs are presented the overall corresponding magnitude responses and the zooms in the passband. The parameters of design generally depend only on number of cascaded combs and generally do not depend on decimation factor. Design parameters are presented in tables along with the corresponding required number of adders.

Sign in / Sign up

Export Citation Format

Share Document