Electronic digital logic circuitry – Interface – Current driving
Reexamination Certificate
2007-05-08
2007-05-08
Chang, Daniel (Department: 2819)
Electronic digital logic circuitry
Interface
Current driving
C330S253000
Reexamination Certificate
active
11266207
ABSTRACT:
An input buffer for use in a differential operational amplifier is disclosed that regulates current through a main input differential pair while preventing output distortion and allowing high linearity. The input buffer includes a main input transistor pair that receives a voltage input, a tail current source, and a squeezable tail current source circuit including a single-ended self-biased folded feedback loop. These are configured such that current through the main input transistor pair is maintained as the voltage input varies. The folded feedback loop includes a folding transistor and a biasing current source that biases the folding transistor. The squeezable tail current source circuit also includes a replica transistor pair, a bias transistor, and a tail transistor pair. The biasing current source and folding transistor isolate the bias transistor and tail transistor pair from a drain voltage of the replica transistor pair, preventing output distortion and allowing high linearity.
REFERENCES:
patent: 6756847 (2004-06-01), Blecker et al.
patent: 6781460 (2004-08-01), Crain et al.
patent: 2005/0110569 (2005-05-01), Bhattacharjee et al.
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