US 2013/0257513 A1 · FULLY COMPLEMENTARY SELF-BIASED DIFFERENTIAL RECEIVER WITH STARTUP CIRCUIT

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.

Claims21

Dependent claims

A method for operating a differential receiver comprising:

modulating a tail current transistor of a first conductivity type by a virtual negative supply voltage;
and
modulating a tail current transistor of a second conductivity type by a virtual positive supply voltage.

A method for operating a fully differential and complementary topology comprising:

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.

Dependencies are inferred from the claim text.

Facts

Application

13/435,981Filed 30 Mar 2012

Published

3 Oct 2013

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

H03F 3/4521
Using MOSFET transistors as the active amplifying circuit: complementary long tailed pairs having parallel inputs and being supplied in parallel
H03F 3/45381
Using junction FET transistors as the active amplifying circuit: long tailed pairs
H03F 3/72
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements: gated amplifiers, i.e. amplifiers which are rendered…
H03F 2203/45466
Indexing scheme relating to differential amplifiers: the CSC being controlled, e.g. by a signal derived from a non specified place in the dif amp…

Fully complementary self-biased differential receiver with startup circuit

Life of this patent

Fully complementary self-biased differential receiver with startup circuit

Life of this patent

Abstract

Claims21