Abstract: The present invention relates to a CMOS peak detection circuit (10) which does not require a blocking diode as is used in conventional peak detection circuits. The detection circuit of the present invention comprises a comparator which functions to compare the current value of an AC input signal to a current peak value stored on a capacitor (16). The output of the comparator is connected to a NAND gate which in turn activates a CMOS transmission gate (12) disposed between the input signal line and the storage capacitor. When the current value of the input signal is greater than the current peak value stored on the capacitor, the CMOS transmission gate is turned on and the AC input signal is transferred to the storage capacitor. Alternatively, if the current value of the input signal is less than that stored on the capacitor, the NAND gate will not activate the CMOS transmission gate, and the input signal cannot pass to the capacitor.