Você está no menu de acessibilidade

Utilize este identificador para citar ou criar um link para este item: http://acervodigital.unesp.br/handle/11449/39983
Título: 
A linearly tunable low-voltage CMOS transconductor with improved common-mode stability and its application to (gm)-C filters
Autor(es): 
Instituição: 
  • Universidade Estadual Paulista (UNESP)
  • Univ Catolica Cordoba
  • Catholic Univ Louvain
ISSN: 
1057-7130
Resumo: 
A linearly tunable low-voltage CMOS transconductor featuring a new adaptative-bias mechanism that considerably improves the stability of the processed-signal common,mode voltage over the tuning range, critical for very-low voltage applications, is introduced. It embeds a feedback loop that holds input devices on triode region while boosting the output resistance. Analysis of the integrator frequency response gives an insight into the location of secondary poles and zeros as function of design parameters. A third-order low-pass Cauer filter employing the proposed transconductor was designed and integrated on a 0.8-mum n-well CMOS standard process. For a 1.8-V supply, filter characterization revealed f(p) = 0.93 MHz, f(s) = 1.82 MHz, A(min) = 44.08, dB, and A(max) = 0.64 dB at nominal tuning. Mined by a de voltage V-TUNE, the filter bandwidth was linearly adjusted at a rate of 11.48 kHz/mV over nearly one frequency decade. A maximum 13-mV deviation on the common-mode voltage at the filter output was measured over the interval 25 mV less than or equal to V-TUNE less than or equal to 200 mV. For V-out = 300 mV(pp) and V-TUNE = 100 mV, THD was -55.4 dB. Noise spectral density was 0.84 muV/Hz(1/2) @1 kHz and S/N = 41 dB @ V-out = 300 mV(pp) and 1-MHz bandwidth. Idle power consumption was 1.73 mW @V-TUNE = 100 mV. A tradeoff between dynamic range, bandwidth, power consumption, and chip area has then been achieved.
Data de publicação: 
1-Jul-2001
Citação: 
IEEE Transactions on Circuits and Systems Ii-analog and Digital Signal Processing. New York: IEEE-Inst Electrical Electronics Engineers Inc., v. 48, n. 7, p. 649-660, 2001.
Duração: 
649-660
Publicador: 
Institute of Electrical and Electronics Engineers (IEEE)
Palavras-chaves: 
  • common-mode stability
  • filter tuning
  • (gm)-C
  • low-voltage CMOS filter
Fonte: 
http://dx.doi.org/10.1109/82.958335
Endereço permanente: 
Direitos de acesso: 
Acesso restrito
Tipo: 
outro
Fonte completa:
http://repositorio.unesp.br/handle/11449/39983
Aparece nas coleções:Artigos, TCCs, Teses e Dissertações da Unesp

Não há nenhum arquivo associado com este item.
 

Itens do Acervo digital da UNESP são protegidos por direitos autorais reservados a menos que seja expresso o contrário.