H - Electricity – 03 – F
Patent
H - Electricity
03
F
330/20
H03F 3/45 (2006.01)
Patent
CA 1259672
IMPROVED DIFFERENTIAL INPUT STAGE FOR DIFFERENTIAL LINE RECEIVERS AND OPERATIONAL AMPLIFIERS Abstract An improved differential input amplifier stage used as the input stage in digital differential line receivers or operational amplifiers. The differential input amplifier stage has a pair of input transistors forming a differential pair with a common output node and two complementary output nodes; a current mirror, coupled to the two complementary output nodes and responsive to a first one of the two complementary output nodes and a single-ended output signal on the second one of the two complementary output nodes; and a current source transistor coupled to the common output node and responsive to the first one of the two complementary output nodes. The current source transistor maintains the voltage on the first one of the two complementary output nodes substantially constant, thereby improving common mode and power supply noise immunity and providing faster differential response by the differential input amplifier stage. - 9 -
566967
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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