Circuit arrangement for forming the square root of an input signal
AssigneeDeutsche Forschungsanstalt fur Luft- und Raumfahrt e.V.
InventorsMichael Solbrig, Matthias Tschentscher
Life of this patent
Estimating the term…
Abstract
A circuit arrangement for forming the square root of an input signal in at least one quadrant. The input signal is fed to the input of a first differential amplifier, the current outputs of which work on two diodes. The two outputs of the first differential amplifier are also connected to the inputs of a second differential amplifier, from one output of which there is a feedback via a diode to one of the outputs of the first differential amplifier. The collectors of the second differential amplifier work on current sources.
Claims17
A circuit arrangement for forming the square root of an input signal in at least one quadrant, comprising:
- a first reference voltage source;
- an operating voltage source;
- a first diode having first and second connecting terminals and a polarity in a flow direction;
- a second diode having first and second connecting terminals and polarity in a flow direction, the second connecting terminals of the first and second diodes being connected to the operating voltage source;
- a first differential amplifier configured as a linear voltage-current converter, the first differential amplifier having a first output, a second output, a first input that forms an input of the circuit arrangement, and a second input connected to the first reference voltage source, the first and second outputs being respectively connected to the first connecting terminal of the first diode and the second diode;
- a second differential amplifier having a first output and a second output, one of the outputs forming an output of the circuit arrangement, a first input connected to the first output of the first differential amplifier, and a second input connected to the second output of the first differential amplifier;
- a first current source connected between the first output of the second differential amplifier and the operating voltage source;
- a second current source connected between the second output of the second differential amplifier and the operating voltage source;
- and
- a third diode connected between the other of the first and second outputs of the second differential amplifier and one of the outputs of the first differential amplifier.
A circuit arrangement for forming the square root of an input signal in at least one quadrant, comprising:
- a first reference voltage source;
- an operating voltage source;
- a first diode having first and second connecting terminals and a polarity in a flow direction;
- a second diode having first and second connecting terminals and polarity in a flow direction, the second connecting terminals of the first and second diodes forming current outputs;
- a first differential amplifier configured as a linear voltage-current converter, the first differential amplifier having a first output, a second output, a first input that forms an input of the circuit arrangement, and a second input connected to the first reference voltage source, the first and second outputs being respectively connected to the first connecting terminal of the first diode and the second diode;
- a second differential amplifier having a first output that forms a current output that forms the square root of the input signal, a second output, a first input connected to the first input of the first differential amplifier and a second input connected to a second output of the first differential amplifier;
- a current source connected between the second output of the second differential amplifier and the operating voltage source;
- a third diode connected between the second output of the second differential amplifier and one of the outputs of the first differential amplifier;
- and
- a fourth diode connected to the second output of the second differential amplifier so as to form a current output.
Dependencies are inferred from the claim text.