Amplitude adjusting circuit

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control

Reexamination Certificate

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Details

C327S327000, C327S328000, C327S538000, C327S542000, C330S288000, C323S315000

Reexamination Certificate

active

11333547

ABSTRACT:
An amplitude adjusting circuit comprises a first current mirror where a variable current of a variable current source is copied into each of 1st-3rd transistors; a second current mirror where the variable current is copied into each of 11th-13th transistors; a third current mirror having 6th-7th transistors where a current through the 2nd transistor copied from the variable current flows through the 6th transistor; a fourth current mirror having 8th-9th transistors where a current through the 12th transistor copied from the variable current flows through the 8th transistor; an inverter that has 1st-2nd conductivity type transistors and produces an output signal corresponding to a current level of the 7th or 9th transistor; a fifth current mirror having 15th-14th transistors where a current through the 14th transistor copied from the 15th transistor's becomes a current sourced by the 7th transistor; and a sixth current mirror having 5th-4th transistors where a current through the 4th transistor copied from the 5th transistor's becomes a current sunk by the 9th transistor.

REFERENCES:
patent: 4791326 (1988-12-01), Vajdic et al.
patent: 4995111 (1991-02-01), Tojo et al.
patent: 6483381 (2002-11-01), Shau
patent: 2005/0002316 (2005-01-01), Maruyama
patent: 2001-119442 (2001-04-01), None

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