Quadrature divider

#Not Applicable

#Not Applicable

#1. Technical Field

#For a more complete understanding of the present invention, and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:

#FIG. 1a is a block diagram of a prior art quadrature divider;

#FIG. 1b illustrates a timing diagram showing the operation of FIG. 1a;

#The present invention is best understood in relation to FIGS. 1-5 of the drawings, like numerals being used for like elements of the various drawings.

#FIG. 1a illustrates a block diagram of the prior art solution for producing a divided quadrature signal. The input signal is LO*2 has a frequency two times the local oscillator frequency. The input signal LO*2 clocks a first latch 10 and is also input to inverter 12. The output of inverter 12 clocks a second latch 14. The Q (non-inverting) output of latch 10 is coupled to the input of latch 14. The Q output of latch 14 is input to inverter 16. The output of inverter 16 is coupled to the input of latch 10.

#FIG. 1b is a timing diagram illustrating the operation of FIG. 1a. The output of inverter 12 ({overscore (LO*2)}) has a 180° phase shift from the LO*2 signal. The output of latch 10 is LO. The output of latch 12 is LO+90°; hence the outputs of latches 10 and 14 provide a quadrature signal that is one-half of the input signal (LO*2).