Band connections for digital substrate noise reduction using active cancellation circuits
Band connections employed in active cancellation circuits for effective reduction of digital substrate noise are proposed. An almostodd-symmetrical noise characteristic is utilized for canceling out noises. Advancing this idea, interlaced connections of four bands are also proposed. Excess cancellation by those bands is more effective for noise reduction in a guard ring than a cancellation by two bands. Use of L-shaped bands on the basis of the interlaced connection suppresses the noise more. Simulation and experimental results show that the proposed band connections reduce the noise.
digital substrate noise active cancellation mixed-signal circuit