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Transduction tuned circuit and associated method

A tuning circuit and transconduction technology, applied in the direction of electrical components, impedance networks, multi-terminal pair networks, etc., can solve the problems of multi-layout area, complex circuit, manufacturing time, cost, layout area and power consumption increase, etc., to achieve Precise filtering characteristics, simplified circuit structure, and reduced power consumption and layout area

Active Publication Date: 2009-03-11
VIA TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, among the various known transconductance tuning circuits and technologies, the known transconductance tuning circuits often occupy more layout area and consume more power due to the complexity of the circuit, making the transconductance-capacitance filtering technology Design and manufacturing time, cost, layout area and power consumption will all increase, which is not conducive to the application of transconductance-capacitance filtering technology

Method used

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  • Transduction tuned circuit and associated method
  • Transduction tuned circuit and associated method
  • Transduction tuned circuit and associated method

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Embodiment Construction

[0060] Please refer to FIG. 1 first, which shows a schematic circuit diagram of a conventional transconductance tuning circuit 10 (hereinafter referred to as the tuning circuit 10) in combination with a transconductance-capacitor filter 22 to form a filter system. The transconductance-capacitor filter 22 is provided with multiple transconductance units 24 (with multiple capacitors, not shown) to combine to achieve a specific filter transfer function, and the tuning circuit 10 is a transconductance tuning circuit. The transconductance coefficient corresponding to each transconductance unit 24 is adjusted based on the principle of the phase-locked loop, so that the filter characteristics of the transconductance-capacitor filter 22 can resist the characteristic drift caused by the variation of manufacturing process and temperature.

[0061] As shown in FIG. 1, the tuning circuit 10 includes a frequency / phase detector 12, a charge pump 14, a low-pass filter 16, and a voltage-controlle...

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Abstract

The invention provides a transduction tuning circuit and the relative method to adjust the transduction factor in transduction-capacity filter system. The tuning circuit uses the constant amplitude and the periodic inputting signal to trigger the transduction unit to charge and discharge the capacity unit to establish the output signal, uses the amplitude testing feedback circuit to adjust the transduction factor of the transduction unit by the amplitude of the output signal and uses the amplitude of the output signal to lock the prearranging amplitude range.

Description

Technical field [0001] The present invention provides a transconductance tuning circuit and related methods, in particular to a transconductance tuning circuit and related methods that tune the transconductance coefficient through an amplitude locked loop. Background technique [0002] In a modern information society, all kinds of documents, data, data, and audio-visual information can be exchanged, processed, and transmitted in the form of electronic signals. Therefore, various signal processing circuits used to process electronic signals have become one of the most important hardware foundations of the modern information society. [0003] The signal processing circuit is mostly composed of various filters. As known to those skilled in the art, one of the techniques for implementing filters is to combine a desired filter transfer function with a transconductor cell (or Gm cell). The transconductance unit is a circuit that can convert the input voltage to the output current accor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H11/08H03H11/00
Inventor 简志昌
Owner VIA TECH INC