High precision receiver with skew compensation
AssigneeAcuid Corporation (Guernsey) Limited
InventorsAlexander Roger Deas, Vasily Grigorievich Atyunin, Igor Anatolievich Abrosimov
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Abstract
A high precision receiver with a means to reduce or compensate the skew caused by the receiver's hysteresis by using a dynamic reference that is varied depending on a current output signal. To avoid oscillation, the reference signal can be switched over with a certain delay.
Claims4
A receiver, comprising:
- a signal input which receives an input signal and a reference input which receives a reference signal;
- a hysteretic comparator having a first input connected to the signal input, a second input connected to a threshold signal, and an output providing an output signal wherein the output signal defines a receiver output which varies between a high-level and a low-level;
- and
- a reference signal adjusting circuit having an adder/subtractor connected to the reference signal and to an offset signal, a circuit control input connected by feedback to said receiver output, and providing the threshold signal to the second input of the hysteretic comparator;
- the circuit being operative to increase the threshold signal when the output signal is at the high level, and to decrease the threshold signal when the output signal is at the low level.
A receiver having an input which receives an input signal and a reference signal, and an output which produces an output digital signal varying from a high level to a low level depending on whether a threshold, that is a function of the reference signal, is crossed by the input signal, the receiver comprising:
- a hysteretic comparator having a first input and a second input, and an output making up the receiver output and providing said output signal;
- wherein the output signal is high-level when the input signal is above a first threshold, and is low-level when the input signal is below a second threshold, the first threshold and the second threshold differing from one another by a hysteresis value, and
- a reference signal adjusting means comprising:
- a signal input,
- a control input to which said output signal is fed via a feedback line,
- an output for providing the threshold signal,
- an offset signal generator for producing an offset signal of substantially half the hysteresis value,
- an adder/subtractor having an input that makes up said adjusting means signal input, the adder/subtractor having another input for receiving said offset signal, and an output providing a sum and difference of these reference signal and offset signal, and
- a multiplexor having an input receiving said sum and difference, a control input that makes up said adjusting means control input and an output that makes up said adjusting means output;
- wherein the reference signal adjusting means increases the reference signal when the output signal is high-level, and decreases the reference signal when the output signal is low-level, and wherein said first comparator input and said adjusting means signal input make up said receiver input so that said input signal is fed to the first comparator input;
- said reference signal is fed to the adjusting means signal input;
- and said adjusting means output is connected to the comparator second input.
Dependencies are inferred from the claim text.