A Switched-Capacitor Band-Pass Filter For Low-Voltage Applications

2006 ◽  
Author(s):  
Mingming Fu ◽  
Zhiliang Chen
Keyword(s):  
Low Voltage ◽  
Switched Capacitor ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Band Pass

scholarly journals A Low-Voltage Multi-Band ZigBee Transceiver

Electronics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 1474
Author(s):  
Zhiqun Li ◽  
Yan Yao ◽  
Zengqi Wang ◽  
Guoxiao Cheng ◽  
Lei Luo
Keyword(s):  
Frequency Synthesizer ◽  
Low Voltage ◽  
Supply Voltage ◽  
Maximum Output Power ◽  
Cmos Technology ◽  
Maximum Output ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Front End ◽  
Band Pass

This paper presents a low-voltage ZigBee transceiver covering a unique frequency band of 780/868/915/2400 MHz in 180 nm CMOS technology. The design consists of a receiver with a wideband variable-gain front end and a complex band-pass filter (CBPF) based on poles construction, a transmitter employing the two-point direct-modulation structure, a Ʃ-Δ fractional-N frequency synthesizer with two VCOs and some auxiliary circuits. The measured results show that under 1 V supply voltage, the receiver reaches −93.8 dBm and −102 dBm sensitivity for 2.4 GHz and sub-GHz band, respectively, and dissipates only 1.42 mW power. The frequency synthesizer achieves −106.8 dBc/Hz and −116.7 dBc/Hz phase noise at 1 MHz frequency offset along with 4.2 mW and 3.5 mW power consumption for 2.4 GHz and sub-GHz band, respectively. The transmitter features 2.67 dBm and 12.65 dBm maximum output power at the expense of 21.2 mW and 69.5 mW power for 2.4 GHz and sub-GHz band, respectively.

Design and Implementation of a Single Clock Dual-Band Switched-Capacitor Filter

2014 ◽  
Vol 705 ◽  
pp. 195-198
Author(s):  
Ying Liu ◽  
Jiang Hua Song ◽  
Jia Ning Cui ◽  
Ying Wang ◽  
Tie Liu Wang
Keyword(s):  
Frequency Characteristic ◽  
Dual Band ◽  
Switched Capacitor ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Amplitude Frequency Characteristic ◽  
Design And Implementation ◽  
Band Pass ◽  
Switched Capacitor Filters ◽  
Selection Of

This paper introduces two bands switched capacitor filters which are realized by using a single clock. The chip is LTC1068 that contains four 2 order band-pass filter. By reasonable selection of working mode and clever collocation of resistances to realize two 4 order band-pass filter which used in acoustic receiving amplifier circuit. Amplitude-frequency characteristic curves are tested in paper by frequency sweeper.

A NEW SWITCHED OPAMP APPROACH FOR IMPROVING THE OPERATION OF AUTO-RESET SWITCHED-CAPACITOR FILTERS

2011 ◽  
Vol 20 (05) ◽  
pp. 835-848 ◽  
Author(s):  
MOHAMMAD RASHTIAN ◽  
OMID HASHEMIPOUR ◽  
KEIVAN NAVI ◽  
ALI JALALI
Keyword(s):  
Power Consumption ◽  
Quality Factor ◽  
Second Order ◽  
Considerable Reduction ◽  
Center Frequency ◽  
Switched Capacitor ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Band Pass ◽  
Switched Capacitor Filters

In this paper, a new switched opamp is presented in order to improve the operation of auto-zeroed switched capacitor circuit. This approach results in a considerable reduction in power consumption and a moderate speed improvement. Based on the above improvement, a second-order band-pass filter with a center frequency of 833 kHz and quality factor of 8 is realized and compared with previous works. The proposed switched opamp is also utilized in the structure of a novel z to -z2 block for the design of pseudo two-path band-pass filters. A second-order pseudo two-path band-pass filter with the same specification of the previous work is designed, simulated, and compared.

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