Method, apparatus, and system for obtaining tuning capacitance for Gm-C filter
AssigneeHuawei Technologies Co., Ltd.
InventorXiaosheng Zhu
Life of this patent
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Abstract
The present invention discloses a method, apparatus and system for obtaining the tuning capacitance of a Gm-C filter. The method includes: integrating a simulated capacitor within a given time via a current, where the simulated capacitor simulates the capacitor of the Gm-C filter which is set to an even capacitor array; and comparing the integral voltage obtained by the integration with the reference voltage, finding a simulated capacitance that makes the integral voltage equal to the reference voltage via gradual approaching by adjusting a control code, and determining the simulated capacitance as the tuning capacitance. The present invention improves the performance of a Gm-C filter without affecting the performance of the Gm-C filter.
Claims20
A method for obtaining a tuning capacitance of a Gm-C filter, comprising:
- generating a current for charging an integrator of the Gm-C filter;
- integrating a simulated capacitor of the Gm-C filter within a given time when the integrator is charged, wherein the simulated capacitor simulates a capacitor of the Gm-C filter which is set to a capacitor array;
- and
- comparing an integral voltage obtained by integrating the simulated capacitor with a preset reference voltage, finding a simulated capacitance of the simulated capacitor that makes the integral voltage equal to the reference voltage via gradual approaching by adjusting a control code, and determining the simulated capacitance as the tuning capacitance.
An apparatus for obtaining a tuning capacitance of a Gm-C filter, comprising:
- a current supply unit, adapted to generate a current to charge an integrator unit;
- the integrator unit, adapted to integrate a simulated capacitor within a given time when it is charged, wherein the simulated capacitor simulates a capacitor of the Gm-C filter which is set to a capacitor array;
- a comparator unit, adapted to compare an integral voltage obtained by integrating the simulated capacitor with a preset reference voltage;
- and
- a controller unit, adapted to find a simulated capacitance of the simulated capacitor that makes the integral voltage equal to the reference voltage via gradual approaching by adjusting a control code and determining the simulated capacitance as the tuning capacitance.
A Gm-C filter tuning system, comprising:
- an apparatus for obtaining a tuning capacitance of a Gm-C filter, adapted to integrate a simulated capacitor which simulates a capacitor of the Gm-C filter that is set to a capacitor array to obtain an integral voltage, find a simulated capacitance that makes the integral voltage equal to a preset reference voltage via gradual approaching by adjusting control codes, determine the simulated capacitance as the tuning capacitance, store a control code associated with the tuning capacitance, and provide the control code for the Gm-C filter to tune the capacitance of the Gm-C filter;
- and
- the Gm-C filter, adapted to tune the tuning capacitance associated with the control code provided by the apparatus.
Dependencies are inferred from the claim text.