BASEBAND NOISE REDUCTION
First Claim
1. An active circuit, comprising:
- a first chopper circuit that receives an input signal and a chopping signal of a frequency higher than a base band of the input signal, and that provides a modulated input signal;
an amplifier that receives the modulated input signal and that provides an amplified signal resulting form amplifying the modulated input signal; and
a second chopper circuit that receives the amplified signal and the chopping signal to provide an output signal.
2 Assignments
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Accused Products
Abstract
An active circuit includes (a) a first chopper circuit that receives an input signal and a chopping signal of a frequency higher than a base band of the input signal, and that provides a modulated input signal; (b) an amplifier that receives the modulated input signal and that provides an amplified signal resulting from amplifying the modulated input signal; and (c) a second chopper circuit that receives the amplified signal and the chopping signal to provide an output signal. The chopping signal has a frequency that may be dynamically adjusted to accommodate changes in impedance and signal spectrum as a result of the operations of the chopper circuits. The active circuit further includes a low pass filter that receives the output signal and that attenuates components of the output signal above the base band of the input signal. In this manner 1/f noise introduced by the amplifier is eliminated or reduced.
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Citations
13 Claims
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1. An active circuit, comprising:
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a first chopper circuit that receives an input signal and a chopping signal of a frequency higher than a base band of the input signal, and that provides a modulated input signal;
an amplifier that receives the modulated input signal and that provides an amplified signal resulting form amplifying the modulated input signal; and
a second chopper circuit that receives the amplified signal and the chopping signal to provide an output signal. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13)
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Specification