We present a new analog circuit exhibiting high bandwidth and low distortion, specially designed for signal correlation in an ultra-wideband receiver front end. The ultra-wideband short impulse signals are correlated with a local pulse template by the correlator. A comparator then samples the output for signal detection. A typical Gilbert mixer core is adopted for multiplication of broadband signals up to 10   GHz . As a result of synchronization of the received signal and the local template, the output voltage level after integration and sampling can reach up to 100   mV , which is sufficient for detection by the comparator. The circuit dissipates about 30 mW from double voltage supplies of 4 V and 4.4 V using 0.24 μ m SiGe BiCMOS technology. Simulation results are presented to show the feasibility of this circuit design for use in ultra-wideband receivers.