US 7,843,229 B2Granted

Signal output circuit

AssigneeNEC Electronics Corporation

InventorsKenji Kimura, Masanori Sato

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Abstract

Disclosed is a signal output circuit comprising: a first transistor of an emitter follower configuration, which receives an input signal; a second transistor of an emitter follower configuration, which receives the input signal, and has an output connected to an external load (106); a comparator circuit which has an input pair connected via resistors to emitters of the first and the second transistors; a first current mirror circuit which has an input connected to an output of a first current source transistor and an output connected to an emitter of the first transistor; and a second current mirror circuit which has an input connected to a connection node of an output of a second current source transistor and an output of the comparator circuit, and has an output connected to an emitter of the second transistor.

Claims8

Dependent claims

A signal output circuit comprising:

a first transistor of an emitter follower configuration, the first transistor receiving an input signal;
a second transistor of an emitter follower configuration, the second transistor receiving the input signal and having an emitter connected to an external load;
a comparator circuit having an input pair for receiving emitter outputs of the first and the second transistors and comparing the received emitter outputs of the first and the second transistors;
first and second current sources;
a first current mirror circuit having an input connected to an output of the first current source, and having an output connected to the emitter of the first transistor;
and
a second current mirror circuit having an input connected to a connection node of an output of the second current source and an output of the comparator circuit, and having an output connected to the emitter of the second transistor.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/382,833Filed 25 Mar 2009
Priority: JP 2008-07846825 Mar 2008
Published: US 2009/0243691 A11 Oct 2009
Granted: 30 Nov 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H03F 3/087
Controlled by light: with IC amplifier blocks
H03F 3/50
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements: amplifiers in which input is applied to, or output is…
H03F 2200/297
Indexing scheme relating to amplifiers: the loading circuit of an amplifying stage comprising a capacitor
H03F 2203/45342
Indexing scheme relating to differential amplifiers: the AAC comprising control means on a back gate of the AAC