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Sampling data bias for continuous time integral circuit

A circuit and time technology, applied in the direction of frequency selection two-terminal-to-network, multi-terminal-to-network, etc., can solve problems such as increasing circuit cost and increasing circuit complexity.

Inactive Publication Date: 2003-06-25
HARRIS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, specifying such a PLL adjustment circuit to handle the compensation for variations would add considerable, additional, semiconductor real estate, and increase circuit complexity and therefore circuit cost

Method used

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  • Sampling data bias for continuous time integral circuit
  • Sampling data bias for continuous time integral circuit
  • Sampling data bias for continuous time integral circuit

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Embodiment Construction

[0026] The transconductance control circuit of the present invention relates to an improvement of the transconductance stage, so that the total transfer function of the filter (specifically, the corner frequency) depends only on a parameter that is easy to control-the switching frequency of the sampling data resistor, and the processed The component (absolute capacitance) of , thus making the behavior of the filter insensitive to process changes. To this end, the present invention involves, by simulating g m The adjustment resistor is replaced by a sampling data resistor image 3 , so that the transconductance becomes a function of one process-dependent variable (absolute capacitance), and thus the transconductance becomes a function of the other component (capacitance) of the transfer function of the integrating stage, thereby effectively making the capacitance in the denominator weight offset. All that remains is one easily controllable variable (frequency).

[0027] The ...

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Abstract

Process-dependent characteristics of a continuous time circuit, e.g., particular the sensitivity of the corner frequency of a continuous time filter to variations in absolute capacitance, is obviated by modifying a resistance-based transconductance tuning circuit, so that the tuning resistor is replaced with a switched capacitor circuit. The effect of this switched sampled data resistor replacement is such that, if each of the resistor-simulating switched capacitor of the transconductance stage and one or more load capacitors of the filter is established in the same processing sequence, what would otherwise be process-sensitive terms in the corner frequency-establishing ratio (gm / C) effectively cancel each other, so that the corner frequency fhi becomes proportional to a readily controlled frequency parameter for the sampled data resistor.

Description

technical field [0001] The present invention relates to continuous time integration circuits, in particular to an improved filter circuit on a chip. Background technique [0002] The design and fabrication of (telecom) signal processing circuits implemented using integrating circuit technology is limited by the characteristics of junction devices which are generally not well controlled due to process variations between wafer lots. In an effort to overcome this limitation, designers of integrating circuits can take advantage of the ability to assemble multiple similar devices on the same chip to reduce by orders of magnitude the variation in absolute device characteristics that exists across wafers obtained from different processing operations. That is, such circuits can be made very insensitive to absolute device characteristics by designing the circuit structure so that its critical parameter parameters depend on the device assembly state on the chip. [0003] One type of ...

Claims

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Application Information

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IPC IPC(8): H03H11/04
CPCH03H11/04
Inventor 布里安·E·威廉姆蒂默斯·J·约翰逊
Owner HARRIS CORP
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