Effective clock-feedthrough reduction in switched capacitor circuits

Willingham, Scott D.; Martin, Kenneth W.

doi:10.1109/iscas.1990.112597

Cited by 12 publications

(5 citation statements)

References 8 publications

(1 reference statement)

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“…A amplitude deste sinal espúrio em 500 Hz, no caso da implementação usando componentes discretos, pode aumentar consideravelmente se não forem usados buffers para desacoplamento de tensão DC entre as saídas do Transformador de Hilbert e as entradas do multiplicador/somador de saída. Esse efeito pode ser consideravelmente reduzido no caso de uma implementação do conversor DSB/SSB em circuito integrado, através do uso de uma estrutura parcialmente ou integralmente diferencial (Willingham e Martin, 1990).…”

Section: Resultados Experimentaisunclassified

“…O fato de que a resposta em freqüência do filtro de meiabanda apresenta desvios desprezíveis na presença de erros na implementação dos coeficientes e ganho DC finito dos amp opsé a principal razão para as diferenças de fase e de amplitude muito pequenas entre as linhas I e Q, istoé, o casamento entre ambas as linhas permanece preciso apesar de aspectos não-ideais da implementação. pletamente diferenciais, quasi-diferenciais ou com realimentação de erro (Willingham e Martin, 1990).…”

Section: Considerações Sobre Imple-mentação Em Circuito Inte-gradounclassified

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Conversão DSB/SSB a capacitores chaveados usando transformadores de Hilbert recursivos

Gomes

Petraglia

2003

Sba Controle & Automação

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Neste trabalho é apresentada a implementação completa de um conversor de modulação DSB (double-sideband) para SSB (single-sideband) a capacitores chaveados, usando componentes discretos. Para se conseguir uma modulação SSB eficiente, um Transformador de Hilbert é utilizado. Uma boa faixa dinâmica e sensibilidade baixa ao erros nas razões de capacitâncias são conseguidas pela implementação do Transformador de Hilbert através de circuitos com funções de transferência recursivas do tipo passa-tudo. A taxa de amostragem do sinal SSB pode ser reduzida por um fator igual a 2 (dois) sem perda de informação, reduzindo a complexidade do circuito e o seu consumo de energia. A conversão de DSB para SSB completa é ilustrada pela apresentação de resultados experimentais. Alguns aspectos práticos relacionados à possível implementação monolítica CMOS deste circuito são considerados.
This work presents the complete implementation of a switched-capacitor double-sideband (DSB) to single-sideband (SSB) converter, using discrete components. In order to obtain efficient SSB modulation, a Hilbert Transformer has been used. The implementation of the Hilbert Transformer through recursive allpass transfer functions allows good dynamic range and low sensitivity to errors on implemented capacitance ratios. The sampling rate of the SSB signal can be halved without loss of information, leading to circuit complexity reduction and savings in power consumption. Experimental results are provided, to verify the complete DSB to SSB conversion. A few practical aspects concerning the possible monolithic CMOS implementation of this circuit are considered

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Section: Resultados Experimentaisunclassified

Section: Considerações Sobre Imple-mentação Em Circuito Inte-gradounclassified

Conversão DSB/SSB a capacitores chaveados usando transformadores de Hilbert recursivos

Gomes

Petraglia

2003

Sba Controle & Automação

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“…33. 34 Several authors have studied the effects of noise in SC It is possible to derive a noise transfer function of the entire filter and optimize the capacitor values in order to reduce their noise contribution. The available degrees of freedom implied in (9) can be used in this optimization process to properly choose the ratios a I , a 2 , kl and k2, maximizing the dynamic range at internal nodes of the second-order allpass section in Figure 3(b) and at the same time minimizing the capacitor ratio spread.…”

Section: Further Practical Considerationsmentioning

confidence: 99%

Low‐passband‐sensitivity switched capacitor filters using a parallel connection of two structurally lossless networks

Gobet

Mitra

Petraglia

1992

Circuit Theory & Apps

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The low-sensitivity property of IIR digital filters designed using a parallel connection of two allpass sections has already been demonstrated in the past few years. This property is closely related to the use of a particular type of allpass structures, called structurally lossless networks, which remain allpass regardless of the coefficient quantization. In this paper we provide a general theory for the synthesis of low-passband-sensitivity switched capacitor (SC) filters using a similar technique. The design of stray-insensitive structurally allpass SC sections is emphasized, ensuring the passivity property for the overall filter. Design examples are presented with computer simulations and experimental results to compare the performance of the different proposed structures. Analytical sensitivity calculations are also derived yielding useful formulae for the prediction of the filter sensitivities with respect to capacitor ratios, particularly in the stopband.

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“…where it is assumed that half of the charge is split on each side based on fast clock transition [13 ], [20], and here:…”

Section: Switch Errorsmentioning

confidence: 99%

A transducer for tomograph imaging applications

Jia¹

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It is my pleasure to express my sincere gratitude and appreciation to my supervisor, Associate Professor Chan Pak Kwong. It was he who chose this promising topic for my research work. His never-ending flow of ideas, great acknowledgments in IC design field and infectious enthusiasm led me through a very rewarding path. His concern and insight have helped me grow far beyond the boundaries of academic research. In particular, I want to thank Prof. Chan for the much-needed encouragement in the past one year, and for his admirable integrity. Special thanks are also extended to my friends Fan Xian Ping, Ng Kian Ann and Lee Wing Foon for unconditionally offering their friendship. If it is not for their unselfish help and assistance, my progress in research would not have been so smooth. Their companionships make me have a wonderful and enjoyable research life. Finally, I would like to acknowledge my husband Hongliang, my daughter Junlu and all my family members for their consistent love and support and always putting their highest priority on my education.

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Effective clock-feedthrough reduction in switched capacitor circuits

Cited by 12 publications

References 8 publications

Conversão DSB/SSB a capacitores chaveados usando transformadores de Hilbert recursivos

Conversão DSB/SSB a capacitores chaveados usando transformadores de Hilbert recursivos

Low‐passband‐sensitivity switched capacitor filters using a parallel connection of two structurally lossless networks

A transducer for tomograph imaging applications

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