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WAve filter

A filter and transconductor technology, applied in the field of filters, can solve problems such as large chip area, and achieve the effects of small chip area, stable operation and low power consumption

Inactive Publication Date: 2003-02-05
MOTOROLA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to these design requirements, the Gm-C filter has a large chip area on the integrated circuit

Method used

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  • WAve filter
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Examples

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Embodiment Construction

[0033] figure 2 is an electrical schematic diagram of filter 200 configured in accordance with the present invention. Here, the same reference numerals are used to avoid unnecessary repetition and depiction of similar components already referenced and depicted in FIG. 1 . Here, only the significant differences of the filter configured according to the present invention compared with the traditional transconductance filter are discussed. Although figure 2 The transconductors shown in have the same numbers, and they consume less chip area and consume less current than conventional transconductors.

[0034] A set of switches 260, 265, 270 are respectively coupled between the output terminals of the transconductors 110, 120, 130 and connected in parallel with the capacitors 115, 125, 135 respectively. The switches can be metal oxide semiconductor field effect transistor (MOSFET) integrated circuit devices.

[0035] The switches 260 , 265 , 270 are operatively responsive to a c...

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Abstract

A transconductance filter (200) comprises multiple stages of a transconductor (110,120,130) having an input and an output, and a switch (260,265,270) coupled between the output and the voltage source. The switch is operatively responsive to the control signal for coupling and decoupling the voltage source directly to the output of the transconductor at least prior to the time the filter is required to filter the input voltage signal. The voltage source is within a predetermined input voltage range of the transconductor defined by a region in which a transconductance of the transconductor is substantially constant and positive.

Description

technical field [0001] The present invention relates generally to the field of filters, and more particularly, to transconductance capacitor filters. Background technique [0002] It is well known to filter analog signals to remove signal components at specific unwanted frequencies. For example, an analog signal resulting from digital-to-analog conversion of a digitally represented signal may include signal components at unwanted frequencies that require filtering. [0003] An example of a conventional multistage transconductance capacitance (Gm-C) filter 100 for removing unwanted frequencies is shown in FIG. 1 . An input voltage signal having a predetermined maximum peak-to-peak voltage excursion is applied to terminal 105, which is coupled to the non-inverting input of transconductor 110. Accordingly, the input voltage signal is applied to the non-inverting input of the transconductor 110 . The transconductor 110 converts the input voltage signal into an output current ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H15/00H03H11/04H03H11/12
CPCH03H11/0455H03H11/04H03H11/12
Inventor 马克·J·卡利科特约翰·K·格罗斯皮尔奇
Owner MOTOROLA INC