Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2006-09-26
2009-11-24
Mai, Lam T (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C330S253000
Reexamination Certificate
active
07623054
ABSTRACT:
Disclosed is a differential amplifier of a multi-level output type comprising a load circuit including a diode-connected first transistor with a source thereof connected to a power supply and a second transistor with a source thereof connected to the power supply and connected to a gate of the first transistor through a capacitor, a differential pair including a third transistor and a fourth transistor with sources thereof connected in common and drains thereof connected to drains of the first and second transistors, respectively, a current source for supplying a current to the differential pair, a first switch connected between a gate of the second transistor and a drain of the fourth transistor, an amplifier with an input thereof connected to a drain of the second transistor and an output thereof connected to an output terminal, a second switch connected between a gate of the fourth transistor and a first input terminal, a third switch connected between the gate of the fourth transistor and a third input terminal, a fourth switch connected between a gate of the third transistor and a second input terminal, and a fifth switch connected between the gate of the third transistor and the output terminal. Switching control between a first state where the first, second and fourth switches are turned on and the third and fifth switches are turned off and a second state where the first and second fourth switches are turned off and the third and fifth switches are turned on is performed.
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Design of Analog CMOS Integrated Circuits, Basic Edition, Mar. 30, 2003; pp. 173-180, translated by Tadahiro Kuroda.
Iriguchi Masao
Tsuchi Hiroshi
Foley & Lardner LLP
Mai Lam T
NEC Corporation
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