Symmetric Linear Equalization Circuit with Increased Gain
First Claim
Patent Images
1. A method comprising:
- receiving first and second input signals at non-inverting inputs of first and second amplifier elements, respectively, the first and second input signals corresponding to symbols of a codeword;
cross-coupling the first and second input signals to frequency-dependent inverting inputs of the second and first amplifier elements, respectively; and
,generating an amplified codeword identification signal using the first and second amplifier elements, the first and second amplifier elements providing a gain corresponding to a combination of common-source gain and common-gate gain, the common-source gain applied to the non-inverting inputs and the common-gate gain applied to the inverting inputs, the amplified codeword identification signal used at least in part to determine a set of output bits represented by the symbols of the codeword.
1 Assignment
0 Petitions
Accused Products
Abstract
Circuits providing low noise amplification with continuous time linear equalization are described. An exemplary circuit includes four amplification elements, such as MOS transistors. The amplification elements are arranged in differential pairs, and the differential pairs are cross-coupled with a frequency-dependent coupling, such as a capacitive coupling, to enhance high-frequency gain. The outputs of the amplification elements are combined to provide an output representing inverted and un-inverted sums of differences in the input signals.
6 Citations
20 Claims
-
1. A method comprising:
-
receiving first and second input signals at non-inverting inputs of first and second amplifier elements, respectively, the first and second input signals corresponding to symbols of a codeword; cross-coupling the first and second input signals to frequency-dependent inverting inputs of the second and first amplifier elements, respectively; and
,generating an amplified codeword identification signal using the first and second amplifier elements, the first and second amplifier elements providing a gain corresponding to a combination of common-source gain and common-gate gain, the common-source gain applied to the non-inverting inputs and the common-gate gain applied to the inverting inputs, the amplified codeword identification signal used at least in part to determine a set of output bits represented by the symbols of the codeword. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method comprising:
-
receiving first and third input signals at respective non-inverting inputs of a first pair of amplifier elements within a first amplifier branch connected to a first load impedance element, the first and third input signals corresponding to symbols of a codeword of a vector signaling code; receiving second and fourth input signals at respective non-inverting inputs of a second pair of amplifier elements within a second amplifier branch connected to a second load impedance element, the second and fourth signals corresponding to symbols of the codeword; cross-coupling the first and third input signals to respective frequency-dependent inverting inputs of the second pair of amplifier elements; cross-coupling the second and fourth input signals to respective frequency-dependent inverting inputs of the first pair of amplifier elements; generating an amplified codeword identification signal using the first and second amplifier branches, the first and second amplifier branches providing a gain corresponding to a combination of common-source gain and common-gate gain, the common-source gain applied to the non-inverting inputs and the common-gate gain applied to the inverting inputs, the amplified codeword identification signal used at least in part to determine a set of output bits represented by the symbols of the codeword. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. An apparatus comprising:
-
first and second amplifier elements configured to (i) receive first and second input signals at non-inverting inputs, respectively, and (ii) cross-couple the first and second input signals to frequency-dependent inverting inputs of the second and first amplifier elements, respectively, the first and second input signals corresponding to symbols of a codeword; and
,a pair of load impedance elements connected to the first and second amplifier elements configured to generate an amplified codeword identification signal, the first and second amplifier elements configured to provide a gain corresponding to a combination of common-source gain and common-gate gain, the common-source gain applied to the non-inverting inputs and the common-gate gain applied to the frequency-dependent inverting inputs, the amplified codeword identification signal used at least in part to determine a set of output bits represented by the symbols of the codeword. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
Specification