Continuous time linear equalizer with two adaptive zero frequency locations
First Claim
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1. A linear equalizer device comprising:
- a first input transistor comprising a first gate terminal a first drain terminal and a first source terminal, the first gate terminal being configured to receive a first input signal;
a second input transistor comprising a second gate terminal a second drain terminal and a second source terminal, the second gate terminal being configured to receive a second input signal;
a first compensation circuit coupled to the first drain terminal; and
a high-frequency zero circuit comprising at least a pair of source resistors and a pair of source capacitors;
wherein;
the pair of source resistors comprises a first source resistor coupled to the first source terminal and a second source resistor coupled to the first source resistor and the second source terminal, a first terminal being positioned between the first source resistor and the second source resistor;
the pair of source capacitors comprises a first source capacitor coupled to the first source terminal and a second source capacitor coupled to the second source terminal, a second terminal being positioned between the first source capacitor and the second source capacitor and coupled to the first terminal.
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Abstract
The present invention is directed to electrical circuits. More specifically, embodiments of the presentation provide a CTLE module that includes a two compensation sections. A high-frequency zero RC section is in the source of the differential pair and close to the bias current source. A low-frequency zero section is coupled to an output terminal and configured outside the input signal path. A DC gain tuning section is coupled to the low-frequency zero section. There are other embodiments as well.
7 Citations
20 Claims
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1. A linear equalizer device comprising:
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a first input transistor comprising a first gate terminal a first drain terminal and a first source terminal, the first gate terminal being configured to receive a first input signal; a second input transistor comprising a second gate terminal a second drain terminal and a second source terminal, the second gate terminal being configured to receive a second input signal; a first compensation circuit coupled to the first drain terminal; and a high-frequency zero circuit comprising at least a pair of source resistors and a pair of source capacitors; wherein; the pair of source resistors comprises a first source resistor coupled to the first source terminal and a second source resistor coupled to the first source resistor and the second source terminal, a first terminal being positioned between the first source resistor and the second source resistor; the pair of source capacitors comprises a first source capacitor coupled to the first source terminal and a second source capacitor coupled to the second source terminal, a second terminal being positioned between the first source capacitor and the second source capacitor and coupled to the first terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A receiver apparatus comprising:
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a first input terminal; a second input terminal; a lost-of-signal detection circuit coupled to the first input terminal and the second input terminal; and an equalizer circuit comprising; a first input transistor comprising a first gate terminal a first drain terminal and a first source terminal, the first gate terminal being coupled to the first input signal; a second input transistor comprising a second gate terminal a second drain terminal and a second source terminal, the second gate terminal being coupled to the second input signal; a first source resistor coupled to the first source terminal; a second source resistor coupled to the first source resistor and the second source terminal; a first terminal positioned between the first source resistor and the second source resistor; a first source capacitor coupled to the first source terminal; a second source capacitor coupled to the second source terminal; a second terminal positioned between the first source capacitor and the second source capacitor and coupled to the first terminal. - View Dependent Claims (18)
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19. A continuous-time linear equalizer device comprising:
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a first input transistor comprising a first gate terminal a first drain terminal and a first source terminal, the first gate terminal being configured to receive a first input signal; a second input transistor comprising a second gate terminal a second drain terminal and a second source terminal, the second gate terminal being configured to receive a second input signal; a first common mode resistor coupled to the first drain terminal; a high-frequency zero circuit comprising at least a pair of source resistors and a pair of source capacitors; wherein; the pair of source resistors comprises a first source resistor coupled to the first source terminal and a second source resistor coupled to the first source resistor and the second source terminal, a first terminal being positioned between the first source resistor and the second source resistor; the pair of source capacitors comprises a first source capacitor coupled to the first source terminal and a second source capacitor coupled to the second source terminal, a second terminal being positioned between the first source capacitor and the second source capacitor and coupled to the first terminal. - View Dependent Claims (20)
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Specification