Patent ID: 8493257
Filing Date: 2013-07-23
Classification: H03M

Abstract:
1. A current-switching cell comprising: a current source; a switch circuit that switches a connection state between said current source and a load so as to switch whether to supply a current from said current source to the load; and a first latch circuit and a second latch circuit that latch and retime a digital input signal based on a first clock signal and a second clock signal that is a negative-phase signal of the first clock signal, respectively, and output a first half-rate signal and a second half-rate signal obtained by dividing the digital input signal into two signals to said switch circuit, said switch circuit comprising: a first switch that is inserted between said current source and the load and driven by the first half-rate signal; a second switch that is inserted between said current source and the load in parallel to said first switch and driven by the second half-rate signal; and a select switch that selectively connects one of a circuit including said first latch circuit and a circuit including said second switch between said current source and the load in accordance with a signal having the same frequency as that of the first clock signal but a different phase from that of the first clock signal.