Patent ID: 7932847
Filing Date: 2011-04-26
Classification: G04F

Abstract:
1. An apparatus for receiving a first input signal and a second input signal and generating a digital output corresponding to a time difference between the first input signal and the second input signal, the apparatus comprising: a first time-to-digital converting circuit (TDC) to generate a first intermediate output corresponding to the time difference; a second TDC to generate a second intermediate output corresponding to the time difference, wherein a linearity of the first intermediate output is better than a linearity of the second intermediate output and a quantization resolution of the second intermediate output is finer than a quantization resolution of the first intermediate output; a correlated output generating circuit, coupled to the first and the second TDCs, to generate a quantization level corresponding to a transition of the first intermediate output, and to map the first and second intermediate outputs to the digital output according to the quantization level.