Temperature compensated wide dynamic range linear envelope detector

摘要

An amplitude modulation detection apparatus that includes an envelope detector portion having a pair of diode rectifiers electrically connected at their cathodes which common cathode connection is connected through a series resistor to the input of a low-pass video filter having parallel- connected termination resistors at its output and input of a selected value. A forward biasing circuit that includes a DC voltage source coupled to a low input off-set operational amplifier having its output applied to the pair of diode rectifiers. A third diode rectifier is connected to the input of the operational amplifier at one side and to ground through a series- connected resistor. The series-connected resistor has a value that is determined in accordance with the values of the resistor connected to the commonly connected cathodes and the termination resistors in order to subject the three diode rectifiers to identical operating conditions to obtain optimum temperature compensation.