Positive feedback enhanced switching equalizer with output pole tuning
First Claim
1. A system for equalizing a data transmission channel, the system having an input and an output and comprising:
- a first switch connected to the input, the first switch being to preserve or reverse a polarity of a signal transmitted by the first switch, depending on a setting of the first switch;
a low-pass filter electrically connected to the first switch,the low-pass filter comprising an amplifier with positive feedback;
a clocked comparator connected to the low-pass filter; and
a switched inverter connected to the clocked comparator, the switched inverter having a data input, a data output, and a control input, and the switched inverter being to receive a digital signal and to output the digital signal or the inverse of the digital signal, depending on a signal at the control input.
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Accused Products
Abstract
A switched equalizer for equalizing the frequency response of a channel with high-frequency attenuation. In one embodiment the differential input of the equalizer is fed to a switch that interchanges the complementary signals at the differential input, changing the sign of the received signal, at each transition of a clock at the Nyquist frequency. The switched signal is filtered by a low-pass filter with positive feedback enhancement at DC gain and digitized by a sense amplifier, and the digital output of the sense amplifier is inverted during every half-cycle of clock at the Nyquist frequency, restoring the sign of the input signal.
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Citations
16 Claims
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1. A system for equalizing a data transmission channel, the system having an input and an output and comprising:
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a first switch connected to the input, the first switch being to preserve or reverse a polarity of a signal transmitted by the first switch, depending on a setting of the first switch; a low-pass filter electrically connected to the first switch, the low-pass filter comprising an amplifier with positive feedback; a clocked comparator connected to the low-pass filter; and a switched inverter connected to the clocked comparator, the switched inverter having a data input, a data output, and a control input, and the switched inverter being to receive a digital signal and to output the digital signal or the inverse of the digital signal, depending on a signal at the control input. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification