Abstract: An envelope detecting circuit is for generating an envelope signal of an input RF signal as described. The envelope detecting circuit includes an input terminal, an output terminal, a balun, a transistor, and an integrating circuit. The transistor, which is operated in the class B or the class C mode, receives an input signal from the balun, amplifies the input signal, and outputs an amplified signal. The integrating circuit, which is provided between the transistor and the output terminal, provides a series circuit of a resistor and a capacitor between the bias supply and ground. The transistor receives the bias through the resistor. The capacitor holds bottom levels of the amplified signal.

Abstract: Disclosed herein is a demodulator, including: a splitting/matching section for carrying out a matching process of making the amplitude and phase of a first modulated signal match respectively the amplitude and phase of a second modulated signal; and a demodulation section for generating a demodulated signal on the basis of the first modulated signal and the second modulated signal, which have been subjected to the matching process carried out by the splitting/matching section, wherein the splitting/matching section has a splitting section, a first matching section, and a second matching section, the first circuit-element constants determining the first input impedance of the first matching section and the second circuit-element constants determining the second input impedance of the second matching section are set at values determined in advance in order to make the first input impedance equal to the second input impedance.

Abstract: A circuit arrangement for matching a demodulator to operating conditions comprises a demodulator designed to demodulate an analog input signal to a demodulated signal. The demodulator is also designed to be driven by a control signal. The circuit arrangement further comprises a sensor which is designed to provide a sensor status signal, and a control unit to whose input side the sensor status signal is applied and which is designed to provide the control signal for the demodulator during operation.

Abstract: A diode detector comprising a detector network adapted to detect and multiply the detected voltage coupled to a divider network that comprise diodes in equal number to the number of diodes in the detector network, provides a passive detector applicable to any application requiring a small, efficient, high output, inexpensive temperature compensated detector for use as demodulator or as power to voltage converter.

Abstract: A diode detector that is stable and linear over a wide range of variations in both temperature and power supply voltage and can be used to regulate a.c. signals produced by devices that are responsive to control signals includes a detector diode and a first resistor in series, a capacitor connected between the junction of first resistor and the detector diode and a reference potential, and a compensator diode and a second resistor in series with each other and with the detector diode and first resistor. An input a.c. signal is provided to a first terminal of the detector diode, and a rectified signal is provided at the junction of the detector diode, the first resistor, and the capacitor. The detector diode and the compensator diode have temperature coefficients that are substantially the same, and those diodes have the same polarities.

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).

Abstract: A temperature stabilized RF detector has a first diode connected between an input terminal for receiving an RF signal and an output terminal for outputting the detection signal of the RF signal, and a second diode connected between the input terminal and a constant voltage source through a buffer circuit. Connecting directions of the first and second diodes are opposite to each other in a circuit for connecting the output terminal and the constant voltage source.