Active load generation circuit and filter using same
First Claim
1. An active load generation circuit comprising:
- a transistor that provides an impedance and has a control terminal and an input terminal, wherein the control terminal receives a control voltage, the input terminal receives an input signal, and the impedance is related to the control voltage;
a voltage control circuit configured to generate an intermediate voltage according to a power supply voltage and a first reference voltage;
a voltage offset and tracking circuit coupled between the voltage control circuit and the transistor and configured to generate the control voltage according to the input signal and the intermediate voltage, wherein the control voltage varies with the input signal; and
a temperature sensing circuit coupled to the voltage control circuit and configured to sense an ambient temperature of the active load generation circuit and adjust the first reference voltage according to the ambient temperature.
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Accused Products
Abstract
This invention discloses an active load generation circuit and a filter. The active load generation circuit includes a transistor, a voltage control circuit, a voltage offset and tracking circuit, and a temperature sensing circuit. The transistor provides an impedance and includes a control terminal and an input terminal. The control terminal receives a control voltage, the input terminal receives an input signal, and the impedance is associated with the control voltage. The voltage control circuit generates an intermediate voltage according to a power supply voltage and a first reference voltage. The voltage offset and tracking circuit generates the control voltage according to the input signal and the intermediate voltage such that the control voltage varies with the input signal. The temperature sensing circuit senses an ambient temperature of the active load generation circuit and adjusts the first reference voltage according to the ambient temperature.
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Citations
20 Claims
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1. An active load generation circuit comprising:
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a transistor that provides an impedance and has a control terminal and an input terminal, wherein the control terminal receives a control voltage, the input terminal receives an input signal, and the impedance is related to the control voltage; a voltage control circuit configured to generate an intermediate voltage according to a power supply voltage and a first reference voltage; a voltage offset and tracking circuit coupled between the voltage control circuit and the transistor and configured to generate the control voltage according to the input signal and the intermediate voltage, wherein the control voltage varies with the input signal; and a temperature sensing circuit coupled to the voltage control circuit and configured to sense an ambient temperature of the active load generation circuit and adjust the first reference voltage according to the ambient temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An active load generation circuit comprising:
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a transistor that provides an impedance and has a control terminal, wherein the control terminal receives a control voltage, and the impedance is related to the control voltage; a voltage control circuit coupled to the transistor and configured to generate the control voltage according to a power supply voltage and a first reference voltage; and a temperature sensing circuit coupled to the voltage control circuit and configured to sense an ambient temperature of the active load generation circuit and adjust the first reference voltage according to the ambient temperature. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A filter comprising:
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a transistor that provides an impedance and has a first terminal, a second terminal, and a control terminal, wherein the first terminal receives an input signal, the second terminal outputs a filtered signal, the control terminal receives a control voltage, and the impedance is related to the control voltage; a capacitor coupled to the second terminal; a voltage control circuit configured to generate the control voltage according to a first reference voltage and coupled to a power supply voltage, a second reference voltage, and the transistor; and a temperature sensing circuit coupled to the voltage control circuit and configured to sense an ambient temperature of the filter and adjust the first reference voltage according to the ambient temperature. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification