Programmable amplifier circuit capable of providing large or larger resistance for feedback path of its amplifier
First Claim
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1. A programmable amplifier circuit, comprising:
- an amplifier;
an input capacitor, coupled to an input of the amplifier, for receiving an input signal;
a feedback capacitor, coupled to the input of the amplifier and an output of the amplifier;
a switched-capacitor resistor circuit coupled to the input of the amplifier and the output of the amplifier; and
a voltage scaling circuit, coupled between the input of the amplifier and the output of the amplifier, configured for simulating a feedback resistor element to scale down a voltage amplitude of a signal generated from the output of the amplifier to generate a feedback signal to the input of the amplifier;
wherein the voltage scaling circuit comprises;
a first impedance unit, coupled to the output of the amplifier; and
a second impedance unit, coupled between the first impedance unit and a reference level;
wherein an intermediate node between the first impedance unit and the second impedance unit is coupled to the feedback signal to be generated to the input of the amplifier.
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Abstract
A programmable amplifier circuit includes an amplifier, an input capacitor coupled to an input of the amplifier, a feedback capacitor coupled to the input of the amplifier and an output of the amplifier, and a switched-capacitor resistor circuit. The switched-capacitor resistor circuit is coupled between the input of the amplifier and the output of the amplifier, and configured for simulating a feedback resistor element to provide a resistance for a feedback path of the amplifier by using at least one capacitor placed between the input of the amplifier and the output of the amplifier to avoid leakage current(s) flowing back to an input of the amplifier.
14 Citations
18 Claims
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1. A programmable amplifier circuit, comprising:
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an amplifier; an input capacitor, coupled to an input of the amplifier, for receiving an input signal; a feedback capacitor, coupled to the input of the amplifier and an output of the amplifier; a switched-capacitor resistor circuit coupled to the input of the amplifier and the output of the amplifier; and a voltage scaling circuit, coupled between the input of the amplifier and the output of the amplifier, configured for simulating a feedback resistor element to scale down a voltage amplitude of a signal generated from the output of the amplifier to generate a feedback signal to the input of the amplifier; wherein the voltage scaling circuit comprises; a first impedance unit, coupled to the output of the amplifier; and a second impedance unit, coupled between the first impedance unit and a reference level;
wherein an intermediate node between the first impedance unit and the second impedance unit is coupled to the feedback signal to be generated to the input of the amplifier.
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2. A programmable amplifier circuit, comprising:
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an amplifier; an input capacitor, coupled to an input of the amplifier, for receiving an input signal; a feedback capacitor, coupled to the input of the amplifier and an output of the amplifier; and a switched-capacitor resistor circuit, coupled between the input of the amplifier and the output of the amplifier, configured for simulating a feedback resistor element to provide a resistance for a feedback path of the amplifier by using at least one capacitor placed between the input of the amplifier and the output of the amplifier to avoid leakage current(s) flowing back to an input of the amplifier; wherein the switched-capacitor resistor circuit comprises; a storage block, couple to the input of the amplifier, for using a first capacitor placed between the input of the amplifier and the output of the amplifier to avoid leakage current(s) flowing the feedback path; and an inverting circuit, coupled to one end of the storage block, for inverting a signal generated from the output of the amplifier to generate a feedback signal to the storage block, or for inverting a signal generated from the storage block to generate a signal to the input of the amplifier. - View Dependent Claims (3, 4, 5, 9)
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6. A programmable amplifier circuit, comprising:
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an amplifier; an input capacitor, coupled to an input of the amplifier, for receiving an input signal; a feedback capacitor, coupled to the input of the amplifier and an output of the amplifier; and a switched-capacitor resistor circuit, coupled between the input of the amplifier and the output of the amplifier, configured for simulating a feedback resistor element to provide a resistance for a feedback path of the amplifier by using at least one capacitor placed between the input of the amplifier and the output of the amplifier to avoid leakage current(s) flowing back to an input of the amplifier; wherein the switched-capacitor resistor circuit comprises; a plurality of storage blocks, coupled between the input of the amplifier and the output of the amplifier, for respectively using a plurality of capacitors placed between the input of the amplifier and the output of the amplifier to the avoid leakage current(s); wherein the plurality of storage blocks are connected in a cascaded structure. - View Dependent Claims (7, 8)
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10. A programmable amplifier circuit, comprising:
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a differential amplifier; a first input capacitor, coupled to a positive input of the differential amplifier, for receiving a first input signal; a second input capacitor, coupled to a negative input of the differential amplifier, for receiving a second input signal; a first feedback capacitor, coupled to the positive input of the differential amplifier and a negative output of the differential amplifier; a second feedback capacitor, coupled to the negative input of the differential amplifier and a positive output of the differential amplifier; a first switched-capacitor resistor circuit, coupled between the positive input of the differential amplifier and the negative output of the differential amplifier, configured for simulating a first feedback resistor element to provide a resistance for a first feedback path of the differential amplifier by using at least one capacitor placed between the positive input of the amplifier and the negative output of the amplifier to avoid leakage current(s) flowing back an input of the differential amplifier; and a second switched-capacitor resistor circuit, coupled between the negative input of the differential amplifier and the positive output of the differential amplifier, configured for simulating a second feedback resistor element to provide a resistance for a second feedback path of the differential amplifier by using at least one capacitor placed between the negative input of the amplifier and the positive output of the amplifier to avoid leakage current(s) flowing back to another input of the differential amplifier; wherein each switched-capacitor resistor circuit comprises; a storage block, for using a specific capacitor to avoid leakage current(s) flowing the first feedback path or the second feedback path; and an inverting circuit, coupled to one end of the storage block, for inverting a signal generated from an output of the differential amplifier to generate a feedback signal to the storage block, or for inverting a signal generated from the storage block to generate a signal to an input of the differential amplifier. - View Dependent Claims (11, 12, 13, 16)
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14. A programmable amplifier circuit, comprising:
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a differential amplifier; a first input capacitor, coupled to a positive input of the differential amplifier, for receiving a first input signal; a second input capacitor, coupled to a negative input of the differential amplifier, for receiving a second input signal; a first feedback capacitor, coupled to the positive input of the differential amplifier and a negative output of the differential amplifier; a second feedback capacitor, coupled to the negative input of the differential amplifier and a positive output of the differential amplifier; a first switched-capacitor resistor circuit, coupled between the positive input of the differential amplifier and the negative output of the differential amplifier, configured for simulating a first feedback resistor element to provide a resistance for a first feedback path of the differential amplifier by using at least one capacitor placed between the positive input of the amplifier and the negative output of the amplifier to avoid leakage current(s) flowing back an input of the differential amplifier; and a second switched-capacitor resistor circuit, coupled between the negative input of the differential amplifier and the positive output of the differential amplifier, configured for simulating a second feedback resistor element to provide a resistance for a second feedback path of the differential amplifier by using at least one capacitor placed between the negative input of the amplifier and the positive output of the amplifier to avoid leakage current(s) flowing back to another input of the differential amplifier; wherein each switched-capacitor resistor circuit comprises; a first storage block, couple to one among the positive input and the negative input of the differential amplifier, for using a first capacitor to avoid leakage current(s) flowing the first feedback path or the second feedback path; and a second storage block, couple between the first storage block and one among the positive output and the negative output of the differential amplifier, for using a second capacitor to avoid leakage current(s) flowing the first feedback path or the second feedback path; wherein the first storage block is connected to the second storage block in a cascaded structure. - View Dependent Claims (15)
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17. A programmable amplifier circuit, comprising:
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a differential amplifier; a first input capacitor, coupled to a positive input of the differential amplifier, for receiving a first input signal; a second input capacitor, coupled to a negative input of the differential amplifier, for receiving a second input signal; a first feedback capacitor, coupled to the positive input of the differential amplifier and a negative output of the differential amplifier; a second feedback capacitor, coupled to the negative input of the differential amplifier and a positive output of the differential amplifier; a first switched-capacitor resistor circuit, coupled between the negative input of the differential amplifier and the negative output of the differential amplifier, configured for simulating a first feedback resistor element to provide a resistance for a first feedback path of the differential amplifier by using at least one capacitor placed between the positive input of the differential amplifier and the negative output of the differential amplifier to avoid leakage current(s) flowing back to an input of the differential amplifier; and a second switched-capacitor resistor circuit, coupled between the positive input of the differential amplifier and the positive output of the differential amplifier, configured for simulating a second feedback resistor element to provide a resistance for a second feedback path of the differential amplifier by using at least one capacitor placed between the negative input of the differential amplifier and the positive output of the differential amplifier to avoid leakage current(s) flowing back to another input of the differential amplifier. - View Dependent Claims (18)
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Specification