In one arrangement, the input voltage multiplied by the further multiplier constitutes a third input to the subtracting circuit.

The second electrical path includes a wire connected between a first terminal of the subtractor circuit and a positive terminal of the battery.

The inventive subtractor circuit (1) is particularly suited for carrying out power detection with an input-side power detector (11).

The sensing circuit includes a subtractor circuit that subtracts the voltage on the second electrical path from the voltage on the third electrical path and provides the feedback signal in response thereto.

The invention relates to a subtractor circuit (1) that furnishes a signal, which is proportional to a difference (UD) of two signal levels existing at the input (2, 3), to an output (OUT2).

The output signal of the time domain coder (4) is decoded by a time domain decoder (8) and the signal thus decoded is subtracted from the input signal by a subtracter circuit (10).

The subtractor (9) circuit does not produce an output in response to changes in the sense of relative movement which do not persist, for example changes resulting from a crop waving in the wind.

Logical circuitry (13,23) of each circuit (1,2,3,4) is coupled to an adder/subtracter (5).

The subtractor sends the excess signal to a tunable gain circuit connected to a laser.

In one arrangement, the input voltage multiplied by the further multiplier constitutes a third input to the subtracting circuit.

The feedback circuit feeds back the output signal of the discriminator to the adder-subtractor as a feedback signal.

The second electrical path includes a wire connected between a first terminal of the subtractor circuit and a positive terminal of the battery.

The inventive subtractor circuit (1) is particularly suited for carrying out power detection with an input-side power detector (11).

The cancelation circuit includes, in part, a control block, N delay and attenuation paths, a combiner, and a subtractor.

The detector circuit comprises a bidirectional hybrid coupler, logarithmic amplifiers connected to the hybrid couple, and a subtractor having an offset connection.