A CMOS Programmable Fourth-Order Butterworth Active-RC Low-Pass Filter
This paper presents a low-pass filter (LPF) for an ultra-high frequency (UHF) radio frequency identification (RFID) reader transmitter in standard SMIC 0.18 μm CMOS technology. The active-RC topology and Butterworth approximation function are employed mainly for high linearity and high flat...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-01-01
|
| Series: | Electronics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-9292/9/2/204 |
| _version_ | 1798005586398281728 |
|---|---|
| author | Changchun Zhang Long Shang Yongkai Wang Lu Tang |
| author_facet | Changchun Zhang Long Shang Yongkai Wang Lu Tang |
| author_sort | Changchun Zhang |
| collection | DOAJ |
| description | This paper presents a low-pass filter (LPF) for an ultra-high frequency (UHF) radio frequency identification (RFID) reader transmitter in standard SMIC 0.18 μm CMOS technology. The active-RC topology and Butterworth approximation function are employed mainly for high linearity and high flatness respectively. Two cascaded fully-differential Tow-Thomas biquads are chosen for low sensitivity to process errors and strong resistance to the imperfection of the involved two-stage fully-differential operational amplifiers. Besides, the LPF is programmable in order to adapt to the multiple data rate standards. Measurement results show that the LPF has the programmable bandwidths of 605/870/1020/1330/1530/2150 kHz, the optimum input 1dB compression point of −7.81 dBm, and the attenuation of 50 dB at 10 times cutoff frequency, with the overall power consumption of 12.6 mW from a single supply voltage of 1.8 V. The silicon area of the LPF core is 0.17 mm<sup>2</sup>. |
| first_indexed | 2024-04-11T12:41:38Z |
| format | Article |
| id | doaj.art-0d423fdf0f1a4f72bda77fe986488313 |
| institution | Directory Open Access Journal |
| issn | 2079-9292 |
| language | English |
| last_indexed | 2024-04-11T12:41:38Z |
| publishDate | 2020-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Electronics |
| spelling | doaj.art-0d423fdf0f1a4f72bda77fe9864883132022-12-22T04:23:28ZengMDPI AGElectronics2079-92922020-01-019220410.3390/electronics9020204electronics9020204A CMOS Programmable Fourth-Order Butterworth Active-RC Low-Pass FilterChangchun Zhang0Long Shang1Yongkai Wang2Lu Tang3College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, ChinaCollege of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, ChinaCollege of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, ChinaInstitute of RF-&OE-ICs, Southeast University, Nanjing 210096, ChinaThis paper presents a low-pass filter (LPF) for an ultra-high frequency (UHF) radio frequency identification (RFID) reader transmitter in standard SMIC 0.18 μm CMOS technology. The active-RC topology and Butterworth approximation function are employed mainly for high linearity and high flatness respectively. Two cascaded fully-differential Tow-Thomas biquads are chosen for low sensitivity to process errors and strong resistance to the imperfection of the involved two-stage fully-differential operational amplifiers. Besides, the LPF is programmable in order to adapt to the multiple data rate standards. Measurement results show that the LPF has the programmable bandwidths of 605/870/1020/1330/1530/2150 kHz, the optimum input 1dB compression point of −7.81 dBm, and the attenuation of 50 dB at 10 times cutoff frequency, with the overall power consumption of 12.6 mW from a single supply voltage of 1.8 V. The silicon area of the LPF core is 0.17 mm<sup>2</sup>.https://www.mdpi.com/2079-9292/9/2/204low-pass filterbutterworthactive-rctow-thomasuhf rfid |
| spellingShingle | Changchun Zhang Long Shang Yongkai Wang Lu Tang A CMOS Programmable Fourth-Order Butterworth Active-RC Low-Pass Filter Electronics low-pass filter butterworth active-rc tow-thomas uhf rfid |
| title | A CMOS Programmable Fourth-Order Butterworth Active-RC Low-Pass Filter |
| title_full | A CMOS Programmable Fourth-Order Butterworth Active-RC Low-Pass Filter |
| title_fullStr | A CMOS Programmable Fourth-Order Butterworth Active-RC Low-Pass Filter |
| title_full_unstemmed | A CMOS Programmable Fourth-Order Butterworth Active-RC Low-Pass Filter |
| title_short | A CMOS Programmable Fourth-Order Butterworth Active-RC Low-Pass Filter |
| title_sort | cmos programmable fourth order butterworth active rc low pass filter |
| topic | low-pass filter butterworth active-rc tow-thomas uhf rfid |
| url | https://www.mdpi.com/2079-9292/9/2/204 |
| work_keys_str_mv | AT changchunzhang acmosprogrammablefourthorderbutterworthactiverclowpassfilter AT longshang acmosprogrammablefourthorderbutterworthactiverclowpassfilter AT yongkaiwang acmosprogrammablefourthorderbutterworthactiverclowpassfilter AT lutang acmosprogrammablefourthorderbutterworthactiverclowpassfilter AT changchunzhang cmosprogrammablefourthorderbutterworthactiverclowpassfilter AT longshang cmosprogrammablefourthorderbutterworthactiverclowpassfilter AT yongkaiwang cmosprogrammablefourthorderbutterworthactiverclowpassfilter AT lutang cmosprogrammablefourthorderbutterworthactiverclowpassfilter |