Signal processing circuit comprising switched transconductors
AssigneeImperial College of Science, Technology and Medicine
InventorsChristofer Toumazou, Nicolas Battersby, deceased
Life of this patent
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Abstract
A signal processing circuit which provides an accurate, continuously tunable impedance includes a tunable continuous time transconductor G(s) which may, for example, be an opto-electronic inductor. This has a discrete time current processor-H(z) connected between its input and output so as to provide current feedback. The discrete time current processor may be based on a switched current memory which can be adapted to provide scaler, differentiator or integrator configurations.
Claims11
A signal processing circuit, having an input and an output, for providing a tunable impedance in a sample-data filter, comprising:
- a tunable continuous time transconductor (or transresistor) having a transconductor function G(s) (or transresistor function R(s));
- and
- a discrete time current (or voltage) processor -H(z), the transconductor and the processor being connected between the input and the output of the signal processing circuit, an output current (or voltage) of the circuit being fed back to the input, the discrete time current (or voltage) processor -H(z) being continuously tunable by the transconductor function, an accuracy of the sample data filter being determined by a ratio of transconductors (or transresistors) in the tunable continuous time transconductor function (or transresistor function).
A signal processing circuit, having an input and an output, for providing a transfer function in a sample-data filter, comprising:
- a tunable continuous time transconductor G(s) (or transresistor R(s));
- and
- a discrete time current (or voltage) processor -H(z), the transconductor (or transresitor) and the processor being connected between the input and the output, an output current (or voltage) of the circuit being fed from the output to the input, the discrete time current (or voltage) processor -H(z) providing the transfer function.
A signal processing circuit, having an input and an output, for providing tunable impedance in a sample-data filter, comprising:
- a tunable continuous time transconductor function (or transresistor function);
- and
- a discrete time function, the tunable continuous time transconductor function (or transresistor function) and the discrete time function being connected between the input and the output, an output current (or voltage) of the circuit being fed from the output to the input, a ratio of transconductors (or transresistors) in the continuous time transconductor function (or transresistor function) determining a time constant of the filter for continuously tuning the circuit.
Dependencies are inferred from the claim text.