Intelligent power management for a programmable matched filter

摘要

A intelligent power management apparatus for use with a matched-filter. A multiplexer multiplexes shifted-in-phase chips and shifted-quadrature-phase chips from an in-phase-shift register and a quadrature-phase-shift register, respectively, to generate multiplexed chips. The multiplexed chips include alternating sets of shifted-in-phase chips and shifted-quadrature-phase chips. A controller generates a POWERDOWN signal when the multiplexed chips from a received-spread-spectrum signal do not have a particular-chip sequence. The controller generates an ACTIVATION signal when the multiplexed chips have the particular-chip sequence present. An adder tree generates a CORRELATION signal when the multiplexed chips have the particular-chip sequence and match or correlate with the settings of the adder tree. A number of AND gates inhibit the multiplexed chips from passing to the adder tree when the POWERDOWN signal is present, and pass the multiplexed chips to the adder tree when the ACTIVATION signal is present.