A temperature compensated detector includes a series circuit formed by successively connecting a first resistor, a first diode, a second diode having a characteristic substantially equal to that of the first diode, and a second resistor, a third resistor, and a fourth resistor. A terminal supplied with a predetermined bias voltage is grounded through the series circuit. A high-frequency signal to be detected is supplied to a junction point between the first resistor and the first diode or a junction point between the second diode and the second resistor. A detected signal is derived from a junction point between the third resistor and the fourth resistor which are respectively connected to both ends of the second diode or the first diode to divide a voltage.
A temperature compensation technique employing a directional coupler providing signals from a forward sample port to a detector circuit for providing a DC output representative of transmitted power. A temperature compensation circuit including a current source is coupled to a reverse sample port of the directional coupler for providing a compensating DC bias current via said coupler, to the detector circuit. The detector circuit and the temperature compensation circuit each include matched diodes and corresponding circuits for tracking temperature and offsetting the effects of temperature on the DC output of the detector circuit.
The diode detector for detecting an RF signal has an input on which the RF signal is received, and an output on which a DC signal corresponding to the RF signal is emitted. The diode detector comprises a detector diode, a compensator diode, and a voltage divider configuration which, in addition to the detector diode and the compensator diode, comprises two resistors, and which form part of a DC path across which a DC bias, V.sub.batt, is applied. The input and output of the diode detector are connected to respective terminals of the detector diode in said DC path. A discharge capacitor ensures that the compensator diode does not receive the RF signal.
