| 摘要 |
Differential receiver having a pair of cross coupled amplifiers improves signal detection in CMOS circuits. Each amplifier includes a first transistor of a first conductivity type and a second transistor of a second conductivity type. A signal input node is coupled to a source region for the first transistor. A signal output node is coupled to drain regions for the first transistor and the second transistor. The differential receiver further includes a third transistor of a first conductivity type. The signal input node for each amplifier is coupled to a gate of the third transistor of the respective amplifier. A drain region of this third transistor is coupled to a positive voltage supply and a source region is coupled to a low voltage potential. The drain region of the third transistor is also coupled to the gate of the first transistor of the respective amplifier.Methods of operation and methods of forming the differential receiver include designing the receiver for current signaling to better impedance match high speed low impedance transmission lines. The novel receiver employs feedback driven by a transmission line coupled to the receiver's input to decrease the input impedance of the receiver. The receiver can match the low impedance of transmission lines while keeping the sizes of devices small and the power dissipation low. In this manner, the receiver facilitates the transmission of high speed signals over long distances with minimal ringing, reflections, noise and cross talk in integrated circuit interconnections.
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