A CMOS 140-mW fourth-order continuous-time low-pass filter stabilized with a class AB common-mode feedback operating at 550 MHz

Abstract A brief presents a 2nd order continuous-time delta-sigma modulator (CT-DSM) using a low pass filter to reduce the slew rate requirement of the output swing of the first integrator. By adding the low pass filter, the desired transfer function of the CT-DSM is altered. Thus a feed-forward based compensation circuit is introduced to transform the altered transfer function to the original condition. The CT-DSM is designed with a bandwidth of 100 Hz to satisfy the requirement of photoplethysmogram (PPG) detection. The CT-DSM is simulated using CMOS 180 nm technology with the layout area 460 μm × 460 μm. The circuit uses a 1.8 V supply voltage and consumes 35.61 μW. The signal-to-noise ratio of the CT-DSM is 101.2 dB, while the SFDR is 99.1 dB.

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5th-Order Continuous-Time Low-Pass Filter Achieving 56 MHz Bandwidth 30.5 dBm IIP3 with a Novel Low-Distortion Amplifier

IEEE Transactions on Circuits & Systems II Express Briefs ◽

10.1109/tcsii.2020.3039247 ◽

2020 ◽

pp. 1-1

Author(s):

Changjoo Park ◽

Yang Azevedo Tavares ◽

Junyong Lee ◽

Jiwon Wo ◽

Minjae Lee

Keyword(s):

Continuous Time ◽

Pass Filter ◽

Low Pass Filter ◽

Low Pass ◽

Low Distortion ◽

Order Continuous

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Design of Programmable Wideband Low Pass Filter with Continuous-Time/Discrete-Time Hybrid Architecture

IEICE Transactions on Electronics ◽

10.1587/transele.e100.c.858 ◽

2017 ◽

Vol E100.C (10) ◽

pp. 858-865 ◽

Cited By ~ 1

Author(s):

Yohei MORISHITA ◽

Koichi MIZUNO ◽

Junji SATO ◽

Koji TAKINAMI ◽

Kazuaki TAKAHASHI

Keyword(s):

Discrete Time ◽

Continuous Time ◽

Hybrid Architecture ◽

Pass Filter ◽

Low Pass Filter ◽

Low Pass

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A Low Power Low-Pass Fourth-Order Filter for WiMAX/LTE Receiver in CMOS 45nm Technology

Journal of Circuits System and Computers ◽

10.1142/s0218126617500487 ◽

2016 ◽

Vol 26 (03) ◽

pp. 1750048 ◽

Cited By ~ 1

Author(s):

Vida Orduee Niar ◽

Gholamreza Zare Fatin

Keyword(s):

Low Power ◽

Fourth Order ◽

Supply Voltage ◽

Pass Filter ◽

Low Pass Filter ◽

Power Filter ◽

Order Filter ◽

Source Follower ◽

Low Pass ◽

Circuit Technique

In this paper, a [Formula: see text]-[Formula: see text] low-pass and low power filter with tunable in-band attenuation for WiMAX/LTE receiver is presented. The fourth-order filter consists of two cascaded biquad stages. The source-follower (SF) stage is used as a key building block in these biquads. In this paper, we have presented a circuit technique to reduce the nonlinearity of the SF stage resulting from unmatched signal swings at the gate and source terminals of the input transistor. The proposed SF stage, is used for design of a linear biquad which is then utilized in a fourth-order Butterworth low-pass filter. The simulation results of the filter for bandwidth of 10 MHz show that the IIP3 of the filter is equal to 8.22[Formula: see text]dBm, in-band noise density is 100[Formula: see text]nV/[Formula: see text]Hz and power consumption is 5.9[Formula: see text]mW. The supply voltage of the filter is equal to 1[Formula: see text]V.

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