Xilinx, Inc.
Adaptable quantizers having dedicated supply voltage for tail device drivers

Abstract:

Apparatus and associated methods relate to a dynamic quantizer circuit including a tail voltage supply magnitude (VTAIL) distinct from a general supply voltage (Avcc/Avss), VTAIL providing power to a tail clock buffer to generate tail clock signals to tail devices. In an illustrative example, a compensation processor may control a regulator producing a determined VTAIL value in response to one or more parametric signals, for example, the Avcc voltage value, a circuit temperature and a transistor speed process (TSP). The TSP signal may be determined, for example, by process-dependent circuit devices. The compensation processor may be, for example, configured to lower VTAIL in response to detecting a worst-case RMS noise corner, or to raise VTAIL in response to detecting a worst-case clock-to-q corner. Various adjustable VTAILs may be configured to continuously optimize RMS noise, offset and speed performance with low power consumption in various quantizers over process, voltage and/or temperature.