Abstract: The servosystem includes adjusting means (1) for changing the position of mechanical element (3), a first transducer (5) for forming an adjusting voltage which is a measure of a desired position of the element, a second transducer (15) for forming a response voltage which is a measure of the actual position of the element, and detection means (13) for forming an error signal (If) which is a measure of a difference between the response voltage and the adjusting voltage. The detection means (13) have a first and a second input (11, 21) which are connected to the first transducer and the second transducer, respectively, and an output (23) which is connected to an input (27) of control means (29) for generating, in dependence on the value of the error signal, a control signal (Vc1, Vc2), for controlling the adjusting means. A compensation resistor (31) is inserted in the connection lead (9) between, for example the first transducer (5) and the input (11) of the detection means (13) connected thereto.

Abstract: A balanced voltage-to-current converter has two cells. Each cell has a first input terminal coupled to a first current source via a diode-connected first transistor and to an output terminal via the main current path of a third transistor, and a second input terminal coupled to a second (controllable) current source via the main current path of a second transistor. The control electrode of the third transistor is connected to the node between the second current source and the second transistor. The first input terminal of one of cell is connected to the second input terminal of the other cell and vice versa. The quiescent current through the third transistor is controlled by a differential amplifier which compares the voltage difference between the control electrode and a first main electrode of the third transistor with a reference voltage which is representative of the current through the third transistor.

Abstract: An amplifier arrangement includes a first amplifier (A1) having a first output terminal (5) for the connection of a first terminal of a load and having at least a first power transistor (PT1) with a main current path for carrying a first current (i1), which current (i1) is related to a first load current flowing via the first output terminal (5), a second amplifier (A2) having a second output terminal (6) for the connection of a second terminal of the load and having at least a second power transistor (PT2) with a main current path for carrying a second current (i2), which current (i2) is related to a second load current flowing via the second output terminal (6) a first circuit (M1) for generating a first signal (s1), which signal (s1) is related to the first current (i1), a second circuit (M2) for generating a second signal (s2), which signal (s2) is related to the second current (i2), a third circuit (M3) for generating at least one control signal (r1, r2), which control signal (r1, r2) is related to a sum

Abstract: An apparatus for monitoring the current in an integrated circuit provided with a current conductor which is to supply current to a semiconductor structure at least temporarily and to supply current to other parts of the circuit. The current conductor is locally split into a first and a second parallel partial current conductor, with the semiconductor structure connected to the first partial current conductor. The first and second partial current conductors are connected to respective first and second connection contacts across which a voltage drop can be derived which is a measure of the value of the current flowing through the semiconductor structure.

Abstract: A temperature compensated amplifier circuit includes a control transistor and an output transistor having a control electrode coupled to the main current path of the control transistor. The control electrode of the output transistor is also coupled to a current supply element which is connected in series with the main current path of the control transistor for supplying a bias current whose variation as a result of thermal cooupling between the current supply element and the output transistor is smaller than the variation of the part of the bias current through the main current path of the control transistor as a result of thermal coupling between the control transistor and the output transistor.

Abstract: Bridge amplifier circuit including a linear amplifier stage (3) which in single-ended configuration drives a load (13). Once the output voltage (U.sub.0) at the output (7) of the amplifier stage (3) has reached the maximum or minimum output swing limit, the voltage on the load terminal (14) remote from the output (7) is either reduced or increased by a switch circuit (15) in response to control signals (36) originating from control means (37) in dependence on the input signal (U.sub.i) and/or the output signal (U.sub.0). The switch circuit (15) includes a bidirectional switch (16) arranged as two controllable diodes (90, T.sub.11) connected in anti-parallel and having very little forward bias. Compensating voltage jumps at the output (7) of the amplifier stage (3), which require a high slew rate, are avoided in this manner.

Abstract: An amplifier circuit in which a first amplifier (A1) and a second amplifier (A2) are protected against short-circuits by a protection apparatus which includes a first device (M1), a second device (M2), a third device (M3) and a protection device (B). For this purpose the first device and the second device generate four signals (s1, s2, s3, s4) related to an equal number of currents (i1, i2, i3, i4), which currents are related to a first or a second load current in the first amplifier or in the second amplifier. In order to control the protection device (B), the third device generates at least two control signals (r1, r2) related to the signal currents (s1, s2, s3, s4), use being made of the equality of the load currents in the absence of short-circuits.

Abstract: An input signal (Vin) is applied to a first amplifier (A1) and a second amplifier (A2) via a circuit (M), which amplifiers are both coupled to an output terminal (U) to supply an output voltage (Vuit). For this purpose the circuit (M) generates two mutually complementary signals which are related to the output signal (Vuit) and the maximum signal values corresponding to the individual output signals of the first amplifier (A1) and the second amplifier (A2). The output signal to be supplied (Vuit) consequently dictates which amplifier (A1, A2) is driven into full conduction.

Abstract: In order to boost the output power of a first amplifier (A1) a second amplifier (A2) can increase the supply voltage difference across the first amplifier (A1). However, variations of the supply voltage difference result in comparatively high distortion. In order to minimize this distortion while maintaining the output power, a signal-follower circuit generates a direct voltage lever which tracks a first output signal of the first amplifier, for which purpose the signal-follower circuit is driven by a third amplifier, which compares the first output signal with a reference signal.