Fully complementary self-biased differential receiver with startup circuit
First Claim
1. A method for operating a differential receiver comprising:
- modulating a tail current transistor of a first conductivity type by a virtual negative supply voltage, wherein the tail current transistor of the first conductivity type is situated between a positive supply voltage and a virtual positive supply voltage; and
modulating a tail current transistor of a second conductivity type by the virtual positive supply voltage, wherein the tail current transistor of the second conductivity type is situated between the virtual negative supply voltage and a negative supply voltage.
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Abstract
In accordance with at least one embodiment, an improved voltage headroom self-biased receiver is provided. In accordance with at least one embodiment, tail current sources are biased so as to be cross-coupled with respect to each other. In accordance with at least one embodiment, startup control is provided to counter defect-induced current and to ensure the circuit can function properly even with large amounts of defect current. In accordance with at least one embodiment, a positive type (p type) channel metal oxide semiconductor (PMOS) tail current transistor is modulated by a negative type (n type) channel metal oxide semiconductor (NMOS) differential pair virtual negative supply voltage and a NMOS tail current transistor is modulated by a PMOS differential pair virtual positive supply voltage. The amplifier'"'"'s output common mode is thus self correcting to p type to n type transistor strength differences.
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Citations
19 Claims
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1. A method for operating a differential receiver comprising:
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modulating a tail current transistor of a first conductivity type by a virtual negative supply voltage, wherein the tail current transistor of the first conductivity type is situated between a positive supply voltage and a virtual positive supply voltage; and modulating a tail current transistor of a second conductivity type by the virtual positive supply voltage, wherein the tail current transistor of the second conductivity type is situated between the virtual negative supply voltage and a negative supply voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for operating a fully differential and complementary topology comprising:
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coupling a first terminal selected from a group consisting of a source, a drain, a gate, and a body of a field effect transistor (FET) to the virtual positive supply voltage; coupling a second terminal selected from the group consisting of the source, the drain, the gate, and the body of the FET to the virtual negative supply voltage; coupling a third terminal selected from the group consisting of the source, the drain, the gate, and the body of the FET to a positive supply voltage; coupling a fourth terminal selected from the group consisting of the source, the drain, the gate, and the body of the FET to a negative supply voltage; referencing a positive tail current source to a virtual negative supply rail voltage associated with a negative tail current source; and referencing the negative tail current source to a virtual positive supply rail voltage associated with the positive tail current source. - View Dependent Claims (9, 10, 11)
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12. A self-biased receiver comprising:
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a positive supply voltage coupled to a positive tail current source, the positive tail current source providing a virtual positive supply voltage; a negative supply voltage coupled to a negative tail current source, the negative tail current source providing a virtual negative supply voltage; a differential amplifier comprising a positive driver portion coupled to the virtual positive supply voltage and a negative driver portion coupled to the virtual negative supply voltage, the virtual positive supply voltage controlling the negative tail current source, and the virtual negative supply voltage controlling the positive tail current source; and a startup circuit, the startup circuit coupled to the virtual positive supply voltage and to the virtual negative supply voltage. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method for operating a differential receiver comprising:
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modulating a tail current transistor of a first conductivity type by a virtual negative supply voltage; modulating a tail current transistor of a second conductivity type by a virtual positive supply voltage; and providing a startup circuit coupled to the virtual positive supply voltage and to the virtual negative supply voltage to provide tolerance of defect current.
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Specification