Inter-Chip Noise Reduction Schematic for Referenced Receivers
Original Publication Date: 1988-Jul-01
Included in the Prior Art Database: 2005-Feb-15
A variety of low-swing receivers are based on the use of symmetrical amplification means, such as strobed latches or differential amplifiers. These circuits can be driven either in differential or in single-ended mode but, in the latter case, the second input has to be connected to a DC Reference Voltage Generator that defines the switching threshold of the circuit. Digital connections generally use the single-ended mode because of a limited number of I/Os due to packaging constraints. The present proposal describes a concept that allows transforming into common mode signals the ground noises that would be received in differential mode by conventional circuits. The adverse effects of this noise can thus be reduced by the common mode rejection ratio of the differential amplifier.