LOW POWER BUFFER WITH GAIN BOOST
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Abstract
The present disclosure provides a detailed description of techniques for implementing a low power buffer with gain boost. More specifically, some embodiments of the present disclosure are directed to a buffer with a stacked transistor configuration, wherein the first transistor receives an input signal and the second transistor receives a complement of the input signal. The first transistor is configured to generate a non-inverting response to the input signal, and the second transistor is configured to generate an inverting response to the complement of the input signal, and to generate a negative gds effect, enabling the buffer to exhibit low power and unity gain across a wide bandwidth. In other embodiments, the stacked transistor configuration can be deployed in a full differential implementation. In other embodiments, the buffer can include techniques for improving linearity, DC level shifts, capacitive input loading, and output slewing, settling, and drive capabilities.
14 Citations
40 Claims
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1-20. -20. (canceled)
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21. A communication system having circuitry for gain boost of an output signal, the communication system comprising:
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at least one communication receiver having an analog-to-digital converter comprising a buffer circuit; and an output node connected to the buffer circuit that drives an output signal to the output node, wherein the buffer circuit comprises; a current mirror connected to a first supply node, the current mirror to produce a current feedback signal, wherein the current mirror provides a feedback path through the current feedback signal to improve symmetry between positive and negative slewing current at the output signal; a first transistor coupled to a first input voltage to form a first input signal; a second transistor coupled to the first input signal and coupled to a second input voltage, the second input voltage being a complement of the first input voltage; a first bias circuit being coupled to the second transistor and being coupled to a bias voltage; and a second bias circuit being coupled to the bias voltage, and being coupled to the current feedback signal through at least one transistor. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A gain boost buffer circuit for providing gain boost of an output signal, the gain boost buffer circuit comprising:
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an output node connected to the gain boost buffer circuit that drives an output signal to the output node, wherein the gain boost buffer circuit comprises; a current mirror connected to a first supply node, the current mirror to produce a current feedback signal, wherein the current mirror provides a feedback path through the current feedback signal to improve symmetry between positive and negative slewing current at the output signal; a first transistor coupled to a first input voltage to form a first input signal; a second transistor coupled to the first input signal and coupled to a second input voltage, the second input voltage being a complement of the first input voltage; a first bias circuit being coupled to the second transistor and being coupled to a bias voltage; and a second bias circuit being coupled to the bias voltage, and being coupled to the current feedback signal through at least one transistor. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification