Temperature compensated radio frequency detector circuit

Details Temperature compensated radio frequency detector circuit Temperature compensated radio frequency detector circuit

1995-05-05

1997-08-19

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

324645, 329352, 455126, G01R 2704, H03D 106, H04B 104

Patent

active

056592531

ABSTRACT:
An RF detector circuit (28), which may be utilized in an output power control loop (10) for an RF transmitter, includes a bridge circuit (50) including a first arm (52) containing a first diode (D2) which rectifies the RF signal and a second arm (54) which contains a second diode (D3) series-coupled to the first diode (D2), and having an RF bypass capacitor (C4). The second diode (D3) serves as a temperature compensator for the first diode (D2). The outputs of the bridge circuit (50) are connected to the inputs of a differential amplifier circuit (32) which provides a signal for use in the power control loop (10). The detector input signal is derived from the sense output of a directional coupler (22). In a second embodiment the compensating diode (D13) has its cathode coupled to the cathode of the rectifying diode (D12), and the full voltage across the rectifying diode (D12) is applied to the differential amplifier circuit (32).

REFERENCES:
patent: 3109992 (1963-11-01), Elliot
patent: 4791380 (1988-12-01), Chiappetta
patent: 5448770 (1995-09-01), Hietala et al.
patent: 5471654 (1995-11-01), Okazaki et al.

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