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AssigneeAmerican Telephone and Telegraph Company, AT&T Bell Laboratories
InventorRonald J. Wozniak
Estimating the term…
An improved differential input amplifier stage used as the input stage in digital differential line receives 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.
In an integrated circuit, a differential input amplifier stage (20) for converting a differential input signal into a single-ended output signal, having:
The digital differential line receiver recited in claim 5, wherein each one of the amplifier stages is a digital inverter.
The digital differential line receiver recited in claim 6, wherein each of the digital inverters has at least two complementary MOS transistors.
An operational amplifier (30) having:
The operational amplifier recited in claim 8, wherein the means is a capacitor.
The operational amplifier recited in claim 9, wherein at least two of said transistors are complementary MOS transistors.
The operational amplifier recited in claim 10, wherein the transistors in the amplifier have coupled control electrodes.
Dependencies are inferred from the claim text.