Amplifying circuit
First Claim
1. A circuit comprising:
- an operational amplifier comprising a positive input end, a negative input end, and an output end;
a first input impedance coupled between the negative input end and a first input signal;
a second input impedance coupled between the negative input end and a second input signal; and
a first output impedance coupled between the negative input end and the output end;
wherein resistances of the first and second input impedances are controlled by a first and a second control signals respectively, so that the resistances of the first and second input impedances are substantially different from each other and are close to each other.
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Abstract
An amplifying circuit includes a differential amplifier having a positive input end, a negative input end, a positive output end, and a negative output end; a first input impedance coupled between the negative input end and a first input signal; a second input impedance coupled between the positive input end and the first input signal; a third input impedance coupled between the negative input end and a second input signal; a fourth input impedance coupled between the positive input end and the second input signal; a first output impedance coupled between the negative input end and the positive output end; a second output impedance coupled between the negative input end and the negative output end; a third output impedance coupled between the positive input end and the positive output end; and a fourth output impedance coupled between the positive input end and the negative output end.
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Citations
21 Claims
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1. A circuit comprising:
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an operational amplifier comprising a positive input end, a negative input end, and an output end; a first input impedance coupled between the negative input end and a first input signal; a second input impedance coupled between the negative input end and a second input signal; and a first output impedance coupled between the negative input end and the output end; wherein resistances of the first and second input impedances are controlled by a first and a second control signals respectively, so that the resistances of the first and second input impedances are substantially different from each other and are close to each other. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A circuit comprising:
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a differential amplifier comprising a positive input end, a negative input end, a positive output end, and a negative output end; a first input impedance coupled between the negative input end and a first input signal; a second input impedance coupled between the positive input end and the first input signal; a third input impedance coupled between the negative input end and a second input signal, the third input impedance being substantially equivalent to the second input impedance; and a fourth input impedance coupled between the positive input end and the second input signal, the fourth input impedance being substantially equivalent to the first input impedance; wherein resistances of the first and second input impedances are controlled by a first and a second control signals respectively. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A circuit comprising:
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a differential amplifier comprising a positive input end, a negative input end, a positive output end, arid a negative output end; a first input impedance coupled between the negative input end and a first input signal; a second input impedance coupled between the positive input end and a second input signal; a first output impedance coupled between the negative input end and the positive output end; a second output impedance coupled between the negative input end and the negative output end; a third output impedance coupled between the positive input end and the positive output end, the third output impedance being substantially equivalent to the second output impedance; and a fourth output impedance coupled between the positive input end and the negative output end, the fourth output impedance being substantially equivalent to the first output impedance, wherein resistances of the first and second output impedances are controlled by a first and a second control signals respectively; wherein the resistances of the first and the second output impedances are close to each other. - View Dependent Claims (16, 17, 18, 19)
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20. A circuit comprising:
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a differential amplifier comprising a positive input end, a negative input end, a positive output end, and a negative output end; a first input impedance coupled between the negative input end and a first input signal; a second input impedance coupled between the positive input end and the first input signal; a third input impedance coupled between the negative input end and a second input signal, the third input impedance being substantially equivalent to the second input impedance; a fourth input impedance coupled betwcen the positive input end and the second input signal, the fourth input impedance being substantially equivalent to the first input impedance; a first output impedance coupled between the negative input end and the positive output end; a second output impedance coupled between the negative input end and the negative output end; a third output impedance coupled between the positive input end and the positive output end, the third output impedance being substantially equivalent to the second output impedance; and a fourth output impedance coupled between the positive input end and the negative output end, the fourth output impedance being substantially equivalent to the first output impedance, wherein the positive output end is for outputting a first output signal, and the negative output end is for outputting a second output signal. - View Dependent Claims (21)
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Specification